*tm 3-4240-343-20&p tm 09205a-20&p/2 unit...

*TM 3-4240-343-20&PTM 09205A-20&P/2

UNIT MAINTENANCE MANUAL(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)

FOR

CHEMICAL BIOLOGICAL MASK: COMBAT VEHICLE M42

(4240-01-258-0064-SMALL)(4240-01-258-0065-MEDIUM)(4240-01-258-0066-LARGE)

CHEMICAL BIOLOGICAL MASK: COMBAT VEHICLE M42A1

(4240-01-369-7854-SMALL)(4240-01-370-2622--MEDIUM)(4240-01-369-7855-LARGE)


(4240-01413-4100-SMALL)(4240-01-413-4101--MEDIUM)

(4240-01 4134102-LARGE)

* This manual supersedes TM 34240-300-20&P, 29 August 1994 including all changes.

WARNING-This document contains export-controlled technical data whose export is restrictedby the Army Export Control Act (Title 22, U.S.S.S., Sec 2751 et seq.) or Executive order 12470. Violation ofthese export laws is subject to severe criminal penalties.

DISTRIBUTION STATEMENT-Distribution authorized to U.S. Government agencies and theircontractors to protect technical or operational information. This determination was made on 24 June 1987.Other requests for this document will be referred to: Technical Director, U.S. Army, Edgewood Research,Development & Engineering Center, ATTN: SCBRD-ENL-V, Aberdeen Proving Ground, MD 21010-5423.

DESTRUCTION NOTICE-Destroy by any method that will prevent disclosure of contents orreconstruction of the document.

HEADQUARTERS, DEPARTMENT OF THE ARMYAND, HEADQUARTERS, MARINE CORPS

31 JULY 1996

PCN 18209205100

WARNINGS point out dangerous steps in the procedures in this manual. Your safety depends on following theinstructions included in all WARNINGS. Several general WARNINGS are included below.

• The mask will not be fully effective in confined spaces when the oxygen content of the air is too low. The CBmask has only been tested and verified to protect against all known military agents.

• DO NOT touch your skin (or the soldier) with n-Amyl acetate (banana oil). It could irritate the skin. Wear rubbergloves.

• DO NOT smoke around n-Amyl acetate (banana oil), it is flammable.• DO NOT test mask assembly with n-Amyl acetate (banana oil) in a closed, poorly ventilated area. Test outdoors

or in a well-aired room, n-Amyl acetate may be toxic if inhaled in quantity.• DO NOT wear contact lenses (soft or hard) while wearing CB Protective Masks. Inadequate oxygen supply to

the corneal surface, exposure to dust, dirt, and smoke/gas may cause serious vision loss or eye damage.Soldiers requiring vision correction are provided optical inserts for their protective masks.

HEALTH/ENVIRONMENTAL HAZARD

• There are two Mask Filter Canisters, the C2 and the C2A1. The C2 canister contains Chromium VI and damagedor unusable canisters are considered Hazardous Waste. (Chromium VI is a known carcinogen if inhaled orswallowed.)

• The C2A 1 canister is chromium-free but must continue to be disposed of in accordance with State and LocalEnvironmental Laws.

• DO NOT throw away damaged or unusable canisters as ordinary trash.• DO turn in damaged or unusable canisters to your hazardous waste management office or Defense Reutilization

and Marketing Office (DRMO).

FIRST AID

For first aid refers to FM 21-1 1.

*TM 3-4240-343-20&PTM 09205A-20&P/2

TECHNICAL MANUAL

DEPARTMENT OF THE ARMYAND HEADQUARTERS, MARINE CORPS

Washington, D.C., 31 JULY 1996

UNIT MAINTENANCE MANUAL

(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)

FOR

CHEMICAL BIOLOGICAL MASK: COMBAT VEHICLE M42(4240-01-258-0064-SMALL)

(4240-01-258-0065-MEDIUM)(4240-0 1-258-0066-LARGE)


(4240-01-369-7854--SMALL)(4240-01-370-2622-MEDIUM)(4240-01-369-7855-LARGE)

CHEMICAL BIOLOGICAL MASK: COMBAT VEHICLE M42A2(4240-01-41 3-4100-SMALL)(4240-01-413-4101-MEDIUM)(4240-01-4134102-LARGE)

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, pleaselet us know. Mail you letter, DA Form 2028 (Recommended Changes to Publications and Blank Forms), or DA Form2028-2 located in the back of this manual direct to: Technical Director, U.S. Army, Edgewood Research, Development& Engineering Center, ATTN: SCBRD-ENL-V, Aberdeen Proving Ground, MD 21010-5423.

Marine Corps Users Submit NAVMC FORM 10772 directly to Commander, Marine Corps Logistics Base (Code 850), 814Radford Blvd., Albany, GA 31704-5000. In addition, a copy of the NAVMC 10772 or naval message should be sent toMARCORSYSCOM (Code SSCNBC), 2033 Barnett Ave., Suite 31 5, Quantico, VA 22134-5010.

In either case, a reply will be sent to you.

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TABLE OF CONTENTS

HOW TO USE THIS MANUAL...................................................................................................... i

CHAPTER 1 INTRODUCTION......................................................................................................1-3

SECTION I. GENERAL INFORMATION ......................................................................................1-3

SECTION II. EQUIPMENT DESCRIPTION AND DATA ...............................................................1-4

SECTION III. PRINCIPLES OF OPERATION ..............................................................................1-14

CHAPTER 2 UNIT MAINTENANCE INSTRUCTION.....................................................................2-1

SECTION I. REPAIR PARTS, SPECIAL TOOLS, TMDE, AND SUPPORT EQUIP ......................2-3

SECTION II. SERVICE UPON RECEIPT .....................................................................................2- 3

SECTION III. EQUIPMENT/USER FITTING INSTRUCTIONS .....................................................2-12

SECTION IV. TROUBLESHOOTING ...........................................................................................2-22

SECTION V. PREVENTIVE MAINTENANCE CHECKS AND SERVICES ....................................2-28

SECTION VI. HOSE ASSEMBLY CONVERSION ........................................................................2-31

SECTION VII. MAINTENANCE PROCEDURES ..........................................................................2-37

SECTION VIII. CLEANING AND SANITIZING .............................................................................2-59

SECTION IX. PREPARATION FOR STORAGE OR SHIPMENT .................................................2-69

APPENDIX A - REFERENCES .....................................................................................................A-1

APPENDIX B - MAINTENANCE ALLOCATION CHART (MAC) ...................................................B-1

APPENDIX C - UNIT MAINTENANCE REPAIR PARTS AND SPECIAL TOOLSLIST..............................................................................................................................................C-1

APPENDIX D - EXPENDABLE AND DURABLE ITEMS LIST ......................................................D-1

CROSS-REFERENCE INDEXES..................................................................................................I-1

INDEX...........................................................................................................................................INDEX 1

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HOW TO USE THIS MANUAL

The safest, easiest, and best way to do maintenance on the Chemical-Biological Mask, M42 / M42A1 / M42A2 is to usethis manual. Learning to use this TM is as easy as reading through the next few pages. Knowing what's in this manualand how to use it will save you time and work, and will help you avoid exposing yourself to unnecessary hazards whileyou do your job.

ORGANIZATION

Page ii has a table of contents to provide easy access to the manual. Pages are numbered consecutively within eachchapter; each page number is prefixed with a chapter number or appendix letter. For example, page 5 of Chapter 2 isnumbered 2-5 and page 3 of appendix B is numbered B-3.

This manual is divided into two chapters, four appendixes, and an alphabetical index. Chapter 2 has an index at thebeginning of the chapter to provide easy access to its content. Each chapter is divided into sections. Chapter 1 containsgeneral information pertaining to location of forms, destruction of Army material, how to store and ship the mask,procedures for reporting any improvement recommendations you may have, as well as, corrosion prevention and control.Chapter 2 gives unit maintenance instructions and includes four types of maintenance activities. These are: ServiceUpon Receipt; Troubleshooting or location of faults by symptoms you can detect; Preventive Maintenance Checks andService (PMCS); and Maintenance Procedures that are used to correct faults and replace failed parts. Within theTroubleshooting and maintenance portions of this manual, you will find the material in functional group code order likethe Maintenance Allocation Chart in Appendix B of this TM. This allows the TM to be aligned with its applicable Repairparts and Special Tools List (RPSTL). For information on how to use the RPSTL, refer to the introduction in Appendix C.

HOW TO FIND PROCEDURES

If you're using the manual to perform Troubleshooting, go to Section IV, and read TROUBLESHOOTING PROCEDURESand proceed according to the instructions there. If you're going to do Scheduled Maintenance, you can turn directly toPreventive Maintenance Checks and Services (PMCS), Section V, and proceed according to the instructions there.

If you are using the manual to perform repair or replacement of a part that you already know is bad, you would start bylocating the part to be replaced in the Alphabetical index located at the back of this manual. Look in the AlphabeticalIndex for a key noun from the mask system or part nomenclature. The Alphabetical Index lists each task under one ormore headings also giving the location for the installation and removal of some part. For example, the procedure forCLEANING AND SANITIZING would be listed under "C" for Cleaning.

Once you've located the correct procedure, read through it to determine if you have everything you need to perform thejob. Make sure all the Equipment Conditions have been met. Familiarize yourself with the potential hazards describedby the WARNINGS and CAUTIONS. You must familiarize yourself with the entire maintenance procedure beforebeginning the maintenance task.

HOW TO USE A MAINTENANCE PROCEDURE

The first page of a maintenance procedure lists everything you will need to perform that procedure. The followingparagraphs describe all the blocks of information you will find there.

TOOLS. Individual tools from your mechanic's tool kit will not be listed under this heading. If any tools from this kit arerequired, the tool kit itself will be listed as the first item. Special tools, and tools from any other source will be listed witha reference to a specific item and appendix number. The referenced appendix will provide you with the necessaryinformation to find or make the tool.

SUPPLIES. If any expendable or consumable supplies are needed to perform the task, they will be listed under thisheading along with the quantity in parentheses and a reference to a figure item and appendix in the back of the TM. Thereferenced appendix will give you the detailed information necessary to requisition the supply if you don't have it onhand. Replacement parts are not normally listed under this heading. The inspection steps in the removal or disassemblyprocedure will tell you which parts to replace. Mandatory repair parts ( parts that are destroyed in disassembly or notnormally reused, such as gaskets and lock washers) are listed under this heading by their nomenclature only. Refer toRepair Parts and Special Tools List (RPSTL), Appendix C for information you need on repair parts.

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CHEMICAL BIOLOGICAL MASKS

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CHAPTER 1INTRODUCTION

SECTION I. GENERAL INFORMATION1-1. SCOPE

a. Type of Manual. Unit maintenance.b. Model Numbers and Equipment Name. Chemical-biological (CB ) mask: combat vehicle M42, M42A1, and

M42A2.c. Purpose of Equipment. Protects the face, eyes, and lungs from field concentrations of CB agents, toxins, and

radioactive fallout particles.

1-2. MAINTENANCE FORMS, RECORDS, AND REPORTS

a. Department of the Army forms and procedures used for equipment maintenance will be those prescribed by DAPAM 738-750, The Army Maintenance Management System (TAMMS), as contained in the MaintenanceManagement update.

b. Marine Corps forms and procedures used for equipment maintenance are prescribed in TM 4700-15/1.

1-3. DESTRUCTION OF ARMY MATERIAL TO PREVENT ENEMY USE

• Refer to TM 43-0002-31 for methods of destruction.

1-4. PREPARATION FOR STORAGE OR SHIPMENT

• Refer to Chapter 2, Section IX, for preparation for storage or shipment.

1-5. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR)

a. If you have ideas on how the M42 series masks can be changed or maintained more effectively, let us know.Send us an EIR. You, the user, are the only one who can tell us what you don't like about your equipment. Letus know why you don't like the design. Put it on an SF 368 (Quality Deficiency Report). Mail it to us at Director,US Army Armament and Chemical Acquisition and Logistics Activity, ATTN: AMSTA-AR-QAW-A (RI), RockIsland, IL 61299-7630. We'll send you a reply.

b. Marine Corps users shall submit a Standard Form 368 (SF368) in accordance with MCO 4855.10 directly to:Commander, Marine Corps Logistics Base (Code 856), 814 Radford Blvd., Albany, GA 31704-5000. We willsend you a reply.

1-6. CORROSION PREVENTION AND CONTROL (CPC)

a. CPC of Army material is a continuing concern. It is important that any corrosion problems with this item bereported so that the problem can be corrected and improvements can be made to prevent the problem in futureitems.

b. While corrosion is typically associated with rusting of metals, it can also include deterioration of other materialssuch as rubber and plastic. Unusual cracking, softening, swelling, or breaking of these materials may be acorrosion problem.

c. If a corrosion problem is identified, it can be reported using a Quality Deficiency Report, SF 368. Use of keywords such as "corrosion", "rust", "deterioration", or "cracking" will assure that the information is identified as aCPC problem.

d. The form should be submitted to Director, US Army Armament and Chemical Acquisition and Logistics Activity,AT'N: AMSTA-AR-QAW-A (RI), Rock Island, IL 61299-7630.

e. Marine Corps Units report CPC problems using SF 368 and procedures prescribed in TM 4700-15/1.

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SECTION II. EQUIPMENT DESCRIPTION AND DATA

1-7. EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES.

The lightweight, chemical-biological masks (M42 / M42A 1 / M42A2 ) consist of a facepiece, canister and hose which iseasy to assemble for transport and storage. The mask assembly is kept dry, when required by climate and mission, by awaterproof bag and stored in a carrier made of mildew-resistant, water repellent, coated nylon.

The facepiece is made of silicone rubber with an inturned sealing surface so it can provide protection to face, eyes, andrespiratory tract from CB agents, toxins and radioactive particles. The mask assembly is not intended for use in anoxygen deficient environment. Nor is it intended to provide protection against carbon monoxide or ammonia. It forms acomfortable seal on a soldier's face as it protects against adverse elements. The mask assembly is equipped with bothfront and side voicemitters for ease of communication and an outlet valve body with a drinking system. To ensure acomfortable fit, the mask assembly is issued in three sizes: small, medium and large which are marked with S, M and Lon the forehead to show sizing. It is also equipped with clear and neutral gray outserts to protect the eyelens fromscratches, reduce sun glare and prevent fogging in cold weather. The M42, M42A 1, and M42A2 masks havemicrophone communication capability that can couple with on board communication systems, through the CombatVehicle Communications (CVC) helmet.

The M42A1 and M42A2 masks have a second skin, universal second skin, or universal second skin (USMC) which fits tothe facepiece and protects the facepiece from liquid agents, and a quick doff hood made of lightweight, butyl rubber-coated fabric, which provides protection to the head and neck from liquid toxic chemical agents. The second skin,universal second skin, or universal second skin (USMC) is issued in two sizes: small and medium/large which aremarked S and M/L on the exterior left cheek.

1-8. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS

a. FACEPIECE ASSEMBLY

• FACEPIECE (1). The following components are molded/assembled into the silicone rubber facepiece:buckle tabs, facepiece openings for eyelens, nosecup, voicemitters, outlet valve, and canister/hose connectors.

• HEAD HARNESS (2). Constructed of elastic webbing sewn to a rectangular head pad and buckled tofacepiece. The ends of the head harness straps have metal strap end clips to prevent fraying of the elastic webbing.Ends of the head harness straps pass through buckles at the two forehead, temple and cheek positions. Elastic webbingconnects the two forehead straps and holds them in proper alignment when the mask assembly is worn. Head harnessstraps attached to buckles at the ends of the tabs permit adjustment to obtain proper fit of the mask assembly.

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1-8. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (CONT)

• NOSECUP ASSEMBLY (3). Made of soft rubber; fits over the soldier's nose and mouth. Diverts exhaled airtoward the outlet valve to reduce fogging of the eyelens.

NOTEThe M42 has a black nosecup; the M42A1 and M42A2 have an improved green nosecup.

• NOSECUP VALVE SEATS (4). Each of two nosecup valve seats holds silicone rubber NOSECUP VALVE DISK(5), which allows filtered air to enter nosecup and prevent moist exhaled air from fogging the eyelens in coldweather.

• INTERNAL DRINK TUBE (6). Allows the soldier to drink while wearing the mask assembly.• AIRFLOW DEFLECTOR (7), located inside the mask assembly, directs inhaled air over eyelens to reduce

fogging. The airflow deflector also supports the inlet valve disk and the inlet valve body.• INLET VALVE BODY (8) and INLET VALVE DISK (9), fits into the airflow deflector, allows filtered air to enter the

mask assembly and prevent moist exhaled air from entering the canister.• OUTLET VALVE COVER (10). Protects outlet valve disk and outlet valve housing from damage.• RETAINER (11). Holds external drink tube quick disconnect coupling.• OUTLET VALVE DISK (12) and OUTLET VALVE HOUSING (13). Located behind outlet valve cover; releases

exhaled air and closes on inhalation to prevent contaminated air from entering mask assembly.• FRONT(14) AND SIDE VOICEMITTERS (15). Transmits the soldier's voice outside the mask assembly.• EXTERNAL DRINK TUBE (16). The External Drink Tube is used to connect the mask assembly to the M1

Canteen cap for drinking. It consists of a length of hose and a quick disconnect coupling half (17) that fits intothe external drink tube retainer.

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Microphone (M42 / M42A 1 / M42A2). Facilitates the use of a radio while wearing the mask assembly and can becoupled into CVC helmet by the microphone cord.

• MICROPHONE (18) AND MICROPHONE CORD (19) (M42 and M42A1 only). Located inside nosecup area ofmask assembly. Microphone cord plugs into the microphone receptacle located on the exterior of the frontvoicemitter.

• DETACHABLE MICROPHONE (20) WITH CORD. Located in the recess of the front voicemitter.

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b. CANISTER CARRIER (21) (M42 / M42A 1 / M42A2)

NOTEYou may have been issued the M42 canister carrier or the product improved model of thecanister carrier. They are interchangeable.

• Permits the user to support the filter canister outside of the mask carrier.• Can hold a variety of NATO (North Atlantic Treaty Organization) filter canisters ( M42A 1 and M42A2 only).• ARMOR QUICK DISCONNECT (22). Attached to the canister cover (23) and permits the filter canister to be

coupled to a vehicle's Gas Particulate Filter Unit (GPFU). The Armor quick disconnect is not detachable (M42Only).

• FILTER CANISTER (24) filters out CB agents and other particles from contaminated air.

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c. HOSE ASSEMBLY (25). The hose assembly connects the filter canister and canister carrier to the maskassembly.

CAUTIONDO NOT remove the hose assembly on the M42 mask. Removal of hose assembly will render themask unserviceable.

• M42 The hose assembly is permanently attached to the side of the M42 mask assembly.

• M42A1 and M42A2 The hose assembly is attached to the mask assembly with the STAR KNOB (26). The hoseassembly is removable and can be relocated on left or right side of the M42A1 or M42A2 mask assembly.

NOTEThe soldier may be issued either the one piece hood OR the quick doff hood and second skin ORuniversal second skin and quick doff hood or hooded overgarment OR the universal second skin(USMC) and hooded overgarment. They are identical in function and effectiveness. However, theone piece hood may not be removed during decon operations.

d. ONE PIECE HOOD (27) (M42 only). Provides protection to the head and neck against liquid toxic chemicalagents encountered in field operations. Made of lightweight butyl rubber-coated fabric. It is attached to the maskassembly during use and stowed in mask carrier.

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e. QUICK DOFF HOOD (M42A1 and M42A2 only).

• QUICK DOFF HOOD (28). Is made of butyl rubber-coated fabric, which protects area of neck and head that isnot covered by mask assembly against CB agents, toxins, and radioactive fallout particles.

• ELASTIC AROUND OPENING (29). Attaches quick doff hood to the second skin. It enables easy removal ofthe quick doff hood.

• ELASTIC AROUND NECK (30). Draws quick doff hood close to the neck to protect from CB agents.• UNDERARM STRAPS (31). Retain quick doff hood on the shoulders. Plastic fasteners (32) are used to attach

the straps.

f. SECOND SKIN (M42A1 / M42A2).

• SECOND SKIN (33) ( M42AI / M42A2). Is made of butyl rubber, and covers facepiece to protect from chemical-biological (CB) agents, toxins, and radioactive fallout particles.

• RUBBER CATCHES (34) ( M42A1 / M42A2). Retains the quick doff hood to the second skin and facepiece;located at the top and bottom of the second skin. RIDGE (35) ( M42A I / M42A2) is used as a secondary sourceof retention for the quick doff hood.

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1-8. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS-(CONT)

g. UNIVERSAL SECOND SKIN (36) (M42A 1 / M42A2). Is made of butyl rubber and covers the facepiece. Itprovides additional protection against liquid agents.

• Interfaces with hooded overgarments.

• Extends beyond the mask facepiece.

h. UNIVERSAL SECOND SKIN (USMC only) (37). Is made of butyl rubber and covers the facepiece. It providesadditional protection against liquid agents.

• Interfaces with hooded overgarments.

• Extends beyond the mask facepiece.

i CLEAR OUTSERTS (38) and NEUTRAL GRAY OUTSERTS (39). Each outsert is seated in a soft rubber ringthat fits over the mask assembly eyelens rings. The rim of the rubber ring fits snugly behind the eyering toprotect the eyelens from scratches. Neutral gray outserts are used to reduce sun glare. The outserts also reducefogging.

j. M1 WATERPROOF BAG (40). The folded waterproof bag and a small envelope containing the RUBBERBANDS (41) are packed in carrier. Instructions for use are printed on the waterproof bag.

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1-8. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS-(CONT)

k. FACEFORM (42)

• Holds mask assembly in proper shape when stored longer than 30 days.

NOTEThe soldier may be issued either mask carrier. Major differences are size and accessory stowagelocations.

1. Mask Carrier is made of mildew-resistant, water-repellant fabric. It has adjustable straps. It is closed with a flapheld by hook and pile material.

• FIELD MASKCARRIER (43).

• COMBAT VEHICLE MASK CARRIER (44). This mask carrier has been redesigned to prevent dirt from enteringthe mask carrier. It also was enlarged to include larger accessory pockets.

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1-9. DIFFERENCE BETWEEN MODELS

This chart shows major equipment and differences between the M42, M42AI, and M42A2.

Table 1-1. Differences Between Models

MASK FEATURES CHEMICAL BIOLOGICAL MASK

M42 M42A1 M42A2

Facepiece X X X

Canister is connected to end coupling of hose assembly X X X

Detachable star knob hose assembly X X

Clamped hose attached directly to facepiece (NOT DETACHABLE) X

Hood (One-Piece) X

Quick Doff Hood X X

Second Skin X X

Universal Second Skin X X X

Universal Second Skin (USMC only) X X X

Clear/Neutral Outserts X X X

Microphone (Internal) X X

Detachable Microphone (External) X

Front and Side Voicemitter X X X

Field Mask Carrier X X X

Combat Vehicle Mask Carrier X X X

Operation Capabilities:

Combat Vehicle X X X

Transportable and stored in carrier X X X

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1-10. EQUIPMENT DATA

a. Tabulated Data

Weight (with carrier and accessories):

M42 4.5 lbs. (2.05 kg)M42A1 mask. 4.5 lbs. (2.05 kg)M42A2 mask. 4.5 lbs. (2.05 kg)

Dimensions: Mask with carrier...12 x 14 x 4.5 in. (30.5 x 35.6 x 11.4 cm.)

b. Shipping and Storage Data.

Number and type of pack: 10 per fiberboard container; I per fiberboard box.

Fiberboard container:

Dimensions: 34.375 x 22 x 16.75 in. (87 x 55.9 x 42.5 cm)

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SECTION III. PRINCIPLES OF OPERATION

1-11. PRINCIPLES OF OPERATION

a. The M42 /M42A 1 /M42A2 chemical-biological masks consists of:

1. Silicone FACEPIECE (1) which fits closely against soldier's face to form a seal;

2. HOSE(2).

3. CANISTER CARRIER (3) with filter canister inside.

4. The ONE PIECE HOOD (4) (M42 ) made of lightweight butyl rubber-coated fabric which provides protection tothe head and neck from liquid toxic chemical agents.

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1-11. PRINCIPLES OF OPERATION (CONT)

5. QUICK DOFF HOOD (5) (M42A1 / M42A2 ) made of lightweight butyl rubber-coated fabric which providesprotection to the head and neck from liquid toxic chemical agents.

6. SECOND SKIN (6) ( M42A 1 / M42A2 ) which fits to the facepiece and protects the facepiece from liquid agents.

7. UNIVERSAL SECOND SKIN(7) (M42A1 /M42A2). which fits to the facepiece and protects the facepiece fromliquid agents and for use with either the quick doff hood or a hooded overgarments.

8. UNIVERSAL SECOND SKIN (USMC only) (8) which fits to the facepiece and protects the facepiece from liquidagents and for use with either the quick doff hood or a hooded overgarments.

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9. MICROPHONE (9) (internal) ( M42 / M42A 1 ) and DETACHABLE MICROPHONE (10) (external) connects toCVC helmet and enables radio communication.

b. Air enters the filter canister, which is held in the CANISTER CARRIER (11). The canister filters out CB agents,toxins, and radioactive fallout particles from contaminated air. Air then passes through the HOSE (12) andDEFLECTOR (13) which is located inside the mask assembly. The air then moves into the eye area of the maskassembly.

c. From the eye area, air enters the NOSECUP (14) through NOSECUP VALVES (15). Filtered air from thenosecup is inhaled by the soldier. Exhaled air is passed through the nosecup area and out through the outletvalve. The OUTLET VALVE COVER (16) protects the outlet valve from contamination and damage, andprovides a retainer for the external drink tube.

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d. Outserts have RUBBER RINGS (17) that fit over mask assembly eyelens rings to secure outserts to maskassembly. The CLEAR (18) and NEUTRAL GRAY OUTSERTS (19) prevent scratching of eyelens and reducefogging of eyelens in cold weather.

e. WATERPROOF BAG (20) keeps mask dry when required by climate and mission.

f. FIELD MASK CARRIER (21) and COMBAT VEHICLE MASK CARRIER (22) provide storage and carrying ofmask assembly along with additionally authorized items (see operator's manual).

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Table of Contents

CHAPTER 2 UNIT MAINTENANCE INSTRUCTIONS

Para. Page

SECTION I. REPAIR PARTS, SPECIAL TOOLS, TMDE, AND SUPPORTEQUIPMENT ...........................................................................................................................2-3

2-1. COMMON TOOLS AND EQUIPMENT..................................................................................2-32-2. SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT.....................................................2-32-3. REPAIR PARTS....................................................................................................................2-3

SECTION II. SERVICE UPON RECEIPT.....................................................................................2-3

2-4. GENERAL.............................................................................................................................2-32-5. SERVICE UPON RECEIPT OF MATERIAL ..........................................................................2-32-6. IDENTIFYING AN INDIVIDUAL'S MASK...............................................................................2-12

SECTION III. EQUIPMENT/USER FITTING INSTRUCTIONS.....................................................2-13

2-7. ADJUSTING MASK ASSEMBLY AT INITIAL FITTING..........................................................2-132-8. CHECKING MASK ASSEMBLY FOR PROPER FUNCTION.................................................2-172-9. CHECKING DRINKING SYSTEM FOR PROPER FUNCTION ..............................................2-21

SECTION IV. TROUBLESHOOTING ..........................................................................................2-23

2-10. TROUBLESHOOTING PROCEDURES...............................................................................2-23

SECTION V. PREVENTATIVE MAINTENANCE CHECKS AND SERVICES(PMCS)....................................................................................................................................2-29

2-11. INTRODUCTION TO PMCS TABLE ...................................................................................2-292-12. PMCS PROCEDURES........................................................................................................2-29

SECTION VI. HOSE ASSEMBLY CONVERSION........................................................................2-33

2-13. LEFT/RIGHT HOSE ASSEMBLY CONVERSION................................................................2-33

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Table of Contents

Para. Page

SECTION VII. MAINTENANCE PROCEDURES ..........................................................................2-39

2-14. GENERAL...........................................................................................................................2-39

Facepiece Assembly2-15. INTERNAL DRINK TUBE....................................................................................................2-402-16. QUICK DISCONNECT COUPLING, EXTERNAL DRINK TUBE ..........................................2-422-17. HEAD HARNESS................................................................................................................2-432-18. SECOND SKIN ...................................................................................................................2-442-19. UNIVERSAL SECOND SKIN...............................................................................................2-462-20. UNIVERSAL SECOND SKIN (USMC only)..........................................................................2-482-21. NOSECUP VALVE DISKS ..................................................................................................2-502-22. AIRFLOW DEFLECTOR, INLET VALVE, AND VALVE BODY ............................................2-512-23. OUTLET VALVE COVER AND OUTLET VALVE DISK .......................................................2-552-24. MICROPHONE ...................................................................................................................2-572-25. DETACHABLE MICROPHONE ...........................................................................................2-582-26. SIDE VOICEMITTER, VOICEMITTER RETAINER, AND GASKET.....................................2-59

Canister Carrier2-27. CANISTER COVER ............................................................................................................2-602-28. ARMOR QUICK DISCONNECT (AQD) ...............................................................................2-61

Hose Assembly2-29. CLAMP COVER..................................................................................................................2-622-30. PORT GASKET ..................................................................................................................2-63

Optical Equipment2-31. OPTICAL INSERT KIT ........................................................................................................2-64

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CHAPTER 2UNIT MAINTENANCE INSTRUCTIONS

SECTION I. REPAIR PARTS, SPECIAL TOOLS, TMDE, AND SUPPORTEQUIPMENT

2-1. COMMON TOOLS AND EQUIPMENT

• For authorized common tools and equipment, refer to the Modified Table of Organization and Equipment(MTOE) applicable to your unit.

2-2. SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT

• Special tools, TMDE, and support equipment required are listed in Appendix C-Repair Parts and Special ToolsList (RPSTL) and Appendix B-Maintenance Allocation Chart (MAC).

2-3. REPAIR PARTS

• Repair parts are listed and illustrated in Appendix C of this manual.

SECTION II. SERVICE UPON RECEIPT

2-4. GENERAL

• This section contains instructions and procedures for services to be performed upon receipt of a new mask.These services include unpacking and checking the mask.

2-5. SERVICE UPON RECEIPT OF MATERIAL

• Table 2-1 contains instructions for performing the services required upon receipt of this equipment.

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Table 2-1. Service upon receipt -- M42 / M42A1 M42A2 Masks

LOCATION ITEM ACTION REMARKS

UNPACKING WARNINGAfter removing the top of a wood

1. OUTER BOX, Flaps (fiberboard box) or box, remove nails or bend nails toFIBERBOARD OR top (wood box)WOOD,AS APPLI-CABLE NOTE

If possible, retain some shippingboxes for possible future turn-ins.Open box by cutting tape andbanding on fiberboard boxes orremove top by cutting bandingand prying open top of woodboxes. Remove nails or bendnails over to prevent injury.Remove inner fiberboard boxes.Remove barrier bar aroundfacepiece folder.

NOTE(M42A1 /M42A2) Second skin,or universal second skin is pack-aged on top of the facepiece inthe facepiece holder.

2. INNER FIBER- a. Microphone ( M42 Open inner box. RemoveBOARD BOX M42A1 ) facepiece microphone (1) (M42 / M42A)

fiberboard folder, and discard poly-bag.outserts, and secondskin or universalsecond skin.

Take clear (2) and neutral gray(3) outserts out of bags anddiscard bags.

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Table 2-1. Service upon receipt -- M42/M42A1 /M42A2 Masks


UNPACKING(CONT)NOTE

Masks stored more than 30 days2. INNER FIBER- a. Microphone ( M42/ shall be stored with faceform in maskBOARD BOX (CONT) M42A1) facepiece assembly. Keep all faceforms. Do

fiberboard folder, Not Discard.outserts, and secondskin, or universal Remove facepiece folder (4).second skin. (Cont) Remove facepiece (5) and second

skin (6), or universal second skin(7) and discard both folder andbag.

b. Facepiece and Loosen head harness straps offaceform. facepiece and remove faceform (8).

Cut tabs (9) where indicated. Storeat organization level.

Remove protective poly-covering(10) from eyelenses (11) by pullingcovering away from eyelens tostretch, then forward to remove.Discard protective covering.

c. Mask Carrier (M42/ Take field mask carrier (12) out ofM42A1) bag and discard bag.

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Table 2-1. Service upon receipt -- M42 / M42A1 / M42A2 Masks


UNPACKING(CONT) d. Mask Carrier (M42A2). Take combat vehicle maskcarrier (13) out of bag anddiscard bag.

e. Quick doff hood Take quick doff hood (14) out(M42A1/M42A2). of bag and discard bag.

f. Microphone cord (M42A1/ Remove microphone cord (15)M42A1) from bag and discard bag.

g. Detachable microphone Take detachable microphone(M42A2). (16) out of bag and discard bag.

h. Canister Carrier (M42). Take canister carrier (17) out ofbag and discard bag.

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Table 2-1. Service upon receipt -- M42/ M42A1 /M42A2 Masks


UNPACKING(CONT) i. Canister Carrier (M42A 1/ Take canister carrier (18) out of bag

M42A2) and discard bag.

j. Vacuum sealed can Store unopened can (19) until is-containing filter sued. Record lot number of filtercanister. canister in accordance with unit

SOP.

k. Hose assembly Take hose assembly (20) out of(M42A/ M42A2). bag and discard bag.

1. Waterproof bag Remove waterproof bag (21) inself-sealing plastic bag (22) fromfield mask carrier (M42 / M42A 1),combat vehicle mask carrier(M42A2). Check that three rubberbands (23) are included. Returnwaterproof bag and rubber bandsto self-sealing bag.

m. Heat sealed bag- Take manual (24) out of bag. Bagmanual may be retained to protect manual.

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Table 2-1. Service upon receipt -- M42 / M42A1/ M42A2 Masks


INSPECTION Inspect equipment for damageincurred during shipment. Ifequipment has been damaged,report the damage on SF 364,Report of Discrepancy (ROD).Check equipment against packingslip to see if shipment is com-plete. Report all discrepancies inaccordance with the instructions

PREPARING TO a. Second skin or Install Second Skin (6) (para 2-STOW THE MASK universal second 18) or universal second skin (7)CARRIER skin (M42A1/ (para 2-19) on facepiece (5).

M42A2)

b. Clear outserts Install clear Outserts (2) onfacepiece (see Operator'sManual).

c. Microphone and Plug microphone cord (15) into mi-Microphone cord crophone receptacle located on the(M42/M42A1). exterior of the front voicemitter.

Route cord behind outlet valvecover (25) (para 2-24).

d. Detachable Micro- Attach detachable microphone (16)phone(M42A2). to front voicemitter opening of

facepiece (para 2-25).

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2-5. SERVICE UPON RECEIPT OF MATERIALTable 2-1. Service upon receipt -- M42 / M42A1 / M42A2 Masks


e. Mask assembly Record 13 digit alphanumericPREPARING TO number (26) in a property bookSTOW THE MASK or log IAW unit SOP.CARRIER (CONT)

f. Hose Assembly Attach the hose assembly (20) tothe mask assembly (5) (seeOperator's Manual).

g. Mask assembly (27) Place faceform (12) into mask(mask assembly, hood, assembly. Place neatly foldedhead harness and face- quick doff hood (l4) (M42AI/form). M42A2) into back of faceform.

Tighten head harness to holdquick doff hood.

h. Mask assembly (28) Place faceform into mask(mask assembly, hood, assembly. Tighten head harnesshead harness and face- to hold faceform.form). (For use withhooded overgarments.)

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2-5. SERVICE UPON RECEIPT OF MATERIALTable 2-1. Service upon receipt -- M42 / M42A1 / M42A2 Masks


STOWING THEMASK CARRIER a. Waterproof bag Store waterproof bag (21) in inside

left end pocket.

b. Neutral gray outserts Store neutral gray outserts (3) inleft back pocket.

c. Manual Store operator's manual (24) in theright back pocket.

d. Mask Assembly Store the mask assembly (27).

e. Mask Assembly Store the mask assembly (28).

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2-5. SERVICE UPON RECEIPT OF MATERIALTable 2-1. Service upon receipt -- M42/ M42A1 1/ M42A2 Masks


STOWING THEMASK CARRIER(Cont) a. Waterproof bag Store waterproof bag (21) in inside

left end pocket.

b. Neutral gray outserts Store neutral gray outserts (3) inleft back pocket.

c. Manual Store operator's manual (24) in theright back pocket.

d. Mask Assembly Store the mask assembly (27).

e. Mask Assembly Store the mask assembly (28).

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2-6. IDENTIFYING AN INDIVIDUAL'S MASK

Although a mask will be used only by the soldier to whom it is issued and fitted, do not make permanent identificationmarking on either mask or mask carrier (AR 700-84). A card may be placed in the exterior side pocket with the soldier'sname or a code number for identification purposes. The date the mask was tested and fitted to the soldier along with theID code will be recorded in accordance with local SOP. Include the lot number of the canister and the mask assembly.

Each unit will devise its own code to ensure operational security. Take care not to include any designations that mayidentify the parent organization.

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SECTION III. EQUIPMENT/USER FITTING INSTRUCTIONS

2-7. ADJUSTING MASK ASSEMBLY AT INITIAL FITTING

THIS TASK COVERS: a. Putting on mask assembly b. Adjusting mask assemblyc. Checking mask assembly for fit

INITIAL SETUP

Personnel Required:NBC NCO or other trained personSoldier to be fitted

Applicable Configurations:M42/M42A1 /M42A2

Materials/Parts:M41 Protection Assessment Test System (If Available)ORn-Amyl acetate (banana oil) (item 11, app D)ORStannic Chloride (tube smoke) (item 16, app D)

References:TC3-41

WARNING

Before putting on and adjusting mask assembly, soldiers shall remove all hairpins, combs, hairknots, buns, or braids that will interfere with mask assembly seal. Soldiers must be clean shavento prevent mask assembly leaks.

DO NOT wear contact lenses (soft or hard) while wearing CB Protective Masks. Inadequateoxygen supply to the corneal surface, exposure to dust, dirt, and smoke/ gas may cause seriousvision loss or eye damage. Soldiers requiring vision correction are provided optical inserts fortheir protective masks.

NOTEInitial mask assembly fitting should be performed by the unit NBC NCO or other trained person.There is no special tool for sizing with the M42 series mask. You will have to use yourjudgement on size selection. Initial fitting is done without the hood installed.

The protective mask fit may be checked by the following equipment/tests. The order ofpreference for mask fitting and testing is the M41 Protection Assessment Test System (PATS) ifavailable, n-Amyl acetate (banana oil), or stannic chloride (tube smoke).

Detailed instructions for checking the fit with the M41 PATS is found in the operator's manual forthe item and in TC 3-41. Detailed instructions for checking the fit with banana oil is in para 2-8 ofthis manual.

After initial fitting of soldier's mask, determine if soldier fires from right or left. Convert maskaccordingly (para 2-13). Determine if soldier requires vision correction and install as required(para 2-31).

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2-7. ADJUSTING MASK ASSEMBLY AT INITIAL FITTING (CONT)a. PUTTING ON MASK ASSEMBLY

WARNINGEdges of can are sharp.

1. Use attached key (1) to open canister can (2) and remove filter canister (3).

NOTEOptical inserts should be installed, if required.

2. Feed hose end connector (4) through canister carrier (5).3. Install filter canister on hose connector and secure canister carrier cover (6).4. Loosen head harness (7) so that strap ends are approximately I in. (2.5 cm) from buckles.

5. Pull head harness over front of mask assembly (8).6. Hold hair back from sealing area and place chin in the chin pocket (9).7. Have soldier slip head harness over head while holding mask assembly against face.

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TM 3-4240-343-20&PTM 09205A - 20&P/2

b. ADJUSTING MASK ASSEMBLY

1. Have soldier hold mask assembly (8) tightly against chin.2. (NBC NCO) Center head harness pad (10) on back of soldier's head and have soldier hold in place.3. (NBC NCO) Place finger or thumb under buckle ( 11) of forehead strap (12). Then give strap end a sharp tug

until buckle feels snug. Adjust other forehead strap in same manner.4. (NBC NCO) Place finger or thumb under buckle (13) of cheek strap (14) and adjust cheek strap until it feels

snug. Adjust other cheek strap in same way.

5. Have soldier release mask assembly. Mask assembly should not slip down. If mask assembly slips, readjustforehead straps and cheek straps until mask assembly remains in place.

6. (NBC NCO) Place finger or thumb under buckle (15) of temple strap (16) and adjust temple strap until bucklefeels snug against finger. Repeat adjustment on other temple strap.

CAUTIONImproperly adjusted internal drink tube may irritate lips if it touches them while wearing maskassembly.

7. Ask if internal drink tube touches soldier's lips. Adjust length of internal drink tube if necessary (para 2-15).

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-7. ADJUSTING MASK ASSEMBLY AT INITIAL FITTING (CONT)

c. CHECKING MASK ASSEMBLY FOR FIT

1. Edge of mask assembly (8) comes up on forehead but not into hairline and within 1 in. (2.5 cm) of ear.2. Temple straps (16) and cheek straps (14) do not cut into ears.3. Soldier's pupils are within the center one-third area (vertical) (17) of the eyelens (18). Adjust optical inserts if

required (para 2-31).4. Mask assembly does not press flesh so tightly that eyes are partly closed.5. Bottom of mask assembly does not cut into throat.6. Skin in front of ear is not wrinkled.7. Nosecup (19) does not obscure vision.8. If mask assembly still does not meet above standards, try another size mask.

WARNINGSoldier's safety depends on proper fitting mask assembly.

NOTEFOLLOW-ON MAINTENANCE: Check the mask assembly for Proper Function. (para 2-8).

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2-8. CHECKING MASK ASSEMBLY FOR PROPER FUNCTION

THIS TASK COVERS: a. Testing mask assembly with M41 PATSb. Testing mask assembly with n-Amyl acetate

INITIAL SETUP:

Applicable Configurations:M42 / M42A1 / M42A2

Personnel Required:NBC NCO or other trained personSoldier to be tested

Materials/Parts:M41 PATSApplicator (item 1, app D)n-Amyl acetate (banana oil) (item 11, app D)Rubber gloves (item 8, app D)

References:TM 3-4240-300-10-2 (M42),TM 3-4240-340- 10 (M42A 1) or TM 3-4240-343-10 (M42A2).TC3-41Commercial Manual (M4 1)

NOTE

PMCS should be conducted and verified prior to proper function testing. The order of preferencefor mask fitting and testing is the M41 Protection Assessment Test system (PATS) if available, n-Amyl acetate (banana oil), or stannic chloride (tube smoke).

a. TESTING MASK ASSEMBLY WITH M41 PATS

1. Screw the canister (1) into the hose connector (2) until it makes contact with the washer. Make a reference mark(3) on the canister. Make a second reference mark (4) on the hose connector which is lined up with the firstreference mark. Rotate the canister an additional 1/4 to 1/2 inch to assure that leakage will not occur.

2. Have soldier put on and adjust mask assembly (para 2-7).3. Refer to TC 3-41 and Commercial Manual for instructions on the use of the M41 PATS.

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2-8. CHECKING MASK ASSEMBLY FOR PROPER FUNCTION (CONT)b. TESTING MASK ASSEMBLY WITH N-AMYL ACETATE

WARNINGN-amyl acetate is flammable. DO NOT touch skin (or the soldier) with n-Amyl acetate. It couldirritate the skin. Wear rubber gloves. DO NOT smoke around n-Amyl acetate. Keep n-Amylacetate away from an open flame. DO test mask assembly in a well-ventilated room. N-Amylacetate may be toxic if inhaled in quantity.

NOTESoldier should breathe deeply through nose only. If soldier smells n-Amyl acetate just beforemasking, test results will be inaccurate.

1. Dip applicator in n-Amyl acetate (banana oil).2. Move applicator approximately I to 2 in. (2.5 or 5.1 cm) from mask assembly as follows:

a. Have soldier turn head to left and move applicator completely around outer edge of mask assembly.

b. Have soldier turn head to the right, again move applicator around outer edge of mask assembly.

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TM 3-4240-343-20&PTM 09205A - 20&P/2

c. Have soldier tilt head upward and turn head from side to side, move applicator under chin around outer edge ofmask assembly.

d. Have soldier tilt head forward, move applicator around outer edge of mask assembly.

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2-8. TESTING MASK ASSEMBLY FOR PROPER FUNCTION (CONT)b. TESTING MASK ASSEMBLY WITH N-AMYL ACETATE (Cont)

e. Have soldier smile and frown while looking straight ahead. Move applicator around both eyelenses (5), frontvoicemitter (6), side voicemitter (7), star knob (8) (M42A l/M42A2) (or hose connection) (M42), and outlet valvecover (9).

f. To test seal integrity for the connector at each end of the hose assembly on the M42A1/M42A2, check the clampcover (10) on each end of the hose (11).

g. The hose is permanently attached to the mask assembly on the M42. To test seal integrity for the connectorhave the soldier check the clamp cover located on the hose and attached to the canister. Check to be sure it isproperly in place.

h. Move applicator around the canister carrier (12).i. Instruct soldier to press palm firmly over Armor Quick Disconnect Opening (13). Have soldier breathe in,

creating a vacuum and collapsing mask assembly. Move applicator around outer edge of mask assembly beforehaving soldier breathe out.

NOTEIf soldier being tested smells n-Amyl acetate (banana oil) during initial fitting and testing, a 5-7minute odor sensitivity recovery period is required before retesting.

3. If soldier can smell n-Amyl acetate, readjust head harness to improve fit (para 2-7) and repeat above check.4. If soldier cannot smell n-Amyl acetate, have him unmask and smell the applicator to be sure that his sense of

smell is not impaired. If soldier's sense of smell is impaired, the mask assembly must be tested in a CS (irritant)chamber or using a smoke tube (item 16, app D) and an aspirator bulb (item 4, app D) containing stannicchloride, which produces an irritating acid smoke. The smoke tube test should be conducted in still air in an areathat can be ventilated.

NOTEFOLLOW-ON MAINTENANCE: Remove mask assembly and stow in carrier in accordance with TM3-4240-300-10-2 (M42), TM 3-4240-340- 10 (M42AI) or TM 3-4240-343-10 (M42A2).

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-9. CHECKING DRINKING SYSTEM FOR PROPER FUNCTION

THIS TASK COVERS: a. Testing Drinking System

INITIAL SETUP

Applicable Configurations:M42 / M42A I / M42A2

Personnel Required:NBC NCO or other trained personSoldier (mask wearer)

TESTING DRINKING SYSTEM

a. Steady mask assembly (1), withdraw quick disconnect coupling half(2) from retainer (3) and let it hang freely.

b. Grasp internal drink tube (4) between your lips.NOTE

If resistance is not felt when checking drinking system, the drinking system leaks. Do not drink,get a new mask.

c. Blow into internal drink tube. If resistance is not felt, drink system is leaking.d. A more positive test may be done on the external drink tube quick disconnect by the following procedure:

(1) Fill cup (5) full of water.(2) Place mask assembly on face.(3) Dip quick disconnect in cup filled with water.(4) Blow into internal drink tube.(5) Watch for bubbles in water. If no bubbles, quick disconnect is operational. If bubbles are detected, the

quick disconnect is not operational. (Refer to para 2-16).

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TM 3-4240-343-20&PTM 09205A - 20&P/2

SECTION IV. TROUBLESHOOTING2-10. TROUBLESHOOTING PROCEDURES

a. Perform functional test first. Then use the symptom index for quick access to the troubleshooting procedures.b. The following describes the use of the troubleshooting procedures.

SYMPTOM INDEX PAGEI. Insufficient Air to User........................................................................................................................................... 2-242. Eyelens Fog Excessively ...................................................................................................................................... 2-253. Mask Assembly Fails To Seal ............................................................................................................................... 2-26

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2-10. TROUBLESHOOTING PROCEDURES -- (CONT)

2-24

TM 3-4240-343-20&PTM 09205A - 20&P/2


2-25

TM 3-4240-343-20&PTM 09205A - 20&P/2


2-26

TM 3-4240-343-20&PTM 09205A - 20&P/2


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TM 3-4240-343-20&PTM 09205A - 20&P/2


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TM 3-4240-343-20&PTM 09205A - 20&P/2

SECTION V. PREVENTATIVE MAINTENANCE CHECKS AND SERVICES(PMCS)

2-11. INTRODUCTION TO PMCS TABLEa. General. Unit PMCS is performed semiannually (every 6 months). The soldier may perform semiannual PMCS

under supervision of NBC NCO or other trained person. Unit PMCS is performed to assure that the moreexperienced NBC NCO regularly checks that the soldier is properly doing daily PMCS. This allows the NBCNCO to perform his responsibilities to assure that: 1. The soldiers are properly performing their daily PMCS; 2.The soldiers are properly performing their monthly PMCS; and 3. That the soldiers are involved in performingthe semiannual PMCS. In addition the NBC NCO is responsible for assuring that those checks identified areperformed on a weekly basis during combat situations. Semiannual PMCS and initial and mandatory fitvalidation M41 test will be scheduled and will be recorded on DD form 314, Preventive Maintenance Scheduleand Record.The Semiannual PMCS will be completely performed in accordance with the applicable operator's manual (TM34240-300-10-2, TM 3-4240-340-10, TM 3-4240-343-10) and this TM. Marine Corps Users will perform andrecord semi-annual maintenance in accordance with procedures prescribed in TM 4700-15/1 and unit SOP.

b. Inspections. The most detailed inspections and PMCS of the mask is performed when it is first received, aftereach use, semiannually and during the annual fit test. The NBC NCO is involved in all of these inspections. Thisallows the NBC NCO to assure that the operator is properly doing the daily PMCS.

c. WARNINGS and CAUTIONS. It is vital to the safety of the operator and the Unit Maintenance personnel that allWARNINGS and CAUTIONS are followed. It is also the responsibility of the NBC NCO to make sure theoperator understands their importance and follows them very carefully.

d. Training Materials. Training materials are available (see Appendix A).

NOTEConduct an initial and annual fit test of all assigned masks using the Protection Assessment TestSystem (PATS M41), if available, banana oil, or stannic chloride.

2-12. PMCS PROCEDURESThe following paragraphs describe the information presented in each column of the PMCS table.

a. Item Number Column. Numbers in this column are for reference. When completing DA Form 2404 (EquipmentInspection and Maintenance Worksheet), include the item number for the check/service indication at fault. Itemnumbers also appear in the order that you must do checks and services for the intervals listed. Record any faultsthat you discover before, during, or after operation. You DO NOT need to record faults that you fix.

b. Interval. This column of your PMCS table tells you when to do a certain check or service.c. Item to be Inspected Column. This column identifies the item to be checked or serviced.d. Procedure Column. This column briefly describes this procedure for performing the check or service. Whenever

replacement or repair is recommended, reference is made to para number for the applicable maintenanceInstruction.

e. Not Fully Mission Capable If: Column. Information in this column only tells you what deficiencies will keep yourequipment from being capable of performing its primary mission safely. DO NOT use your mask if a check andservice shows a fault listed in this column. Shortcomings or minor discrepancies which DO NOT limit operationalcapability or safety of use may require corrective surveillance, but does not "deadline" the mask.

f. Other Table Entries. Be sure to observe all special information and notes that appear in your table.

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Table 2-2. UNIT PREVENTIVE MAINTENANCE CHECKSAND SERVICES

ITEM INTERVAL ITEM TO BE PROCEDURE NOT FULLYNO. CHECKED OR MISSION

SERVICED CAPABLE IF:

CAUTIONDO NOT use a high pressure hose toclean mask. It may damagecomponents.

NOTESanitizing will be done prior to reissueto another soldier or prior to turn-in asexcess.

Make sure finish covers all metal surfaces.Coat all bare metal surfaces with lacquer(item 10, APP D).

1 Semiannual Mask Assembly a. Check mask assembly (1) for dirt or Mask assembly is dirtySchedule permanent set which may affect fit or enough to affect mask(PMCS)* conformance to the face. Signs of assembly seal or

permanent set are: function.

1. Mask assembly is difficult to spread Mask assembly has aopen. permanent set, or2. Unusual stiffness in sealing area of stiffness.mask assembly.

b. Check rubber next to eyelens (2) to be Eyelens will pull awaysure neither eyelens will pull away from from mask assembly.mask assembly.

2 Semiannual Front Voicemitter a. Check Front Voicemitter (3) for damage, Front Voicemitter isSchedule cracks or distortion that may affect voice cracked, damaged or(PMCS)* transmission. distorted.

* Weekly incombat situa-tions

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Table 22. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES

ITEM INTERVAL ITEM TO BE PROCEDURE NOT FULLYNO. CHECKED OR MISSION

SERVICED CAPABLE IF:

3 Semiannual Side voicemitterSchedule(PMCS)*

a. Remove side voicemitter retainer (4) by Side voicemitterunscrewing counter clockwise with the retainer has cracks orD-ring on the carrier. Inspect retainer for distortion.cracks or distortion. For replacementsee para 2-26.

b. Remove side voicemitter (5) and inspect Side voicemitterfor holes, cracks, or warping. For retainer has cracks orreplacement see para 2-26. distortion.

c. Remove gasket (6) and check for splits, Gasket is split, stickysticky, or compressed areas. For or compressed.replacement see para 2-26.

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SECTION VI. HOSE ASSEMBLY CONVERSION

2-13. LEFT/RIGHT HOSE ASSEMBLY CONVERSION

THIS TASK COVERS: a. Conversion Instructions

INITIAL SETUP

Applicable Configurations:M42A 1 / M42A2

Equipment condition:Quick Doff Hood removed. (See Operator's Manual)

CONVERSION INSTRUCTIONS

1. Remove hose (1) by unscrewing the star knob (2) counterclockwise.CAUTION

Be careful when disconnecting buttons. The mask assembly may be damaged if care is notexercised.

2. Disconnect the airflow deflector (3) from mask assembly (4) by carefully pulling the silicon rubber housing (5)away from the airflow deflector buttons (6).

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-13. LEFT/RIGHT HOSE ASSEMBLY CONVERSION (CONT)

3. Grasp a tab (7) on inlet valve body (8) and pull toward center of inlet valve body until unsealed from sideport (9).

4. Tuck unseated portion of inlet valve body into the mask assembly. Remove airflow deflector from maskassembly.

5. Remove side voicemitter retainer (10) by unscrewing counterclockwise using the D-ring (11) on the mask carrier.

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6. Remove side voicemitter (12) from mask assembly by pressing from inside of mask assembly (4). Removegasket (13) from sideport (9) housing on mask exterior.

WARNINGBe sure the inlet valve body is installed on the post of the airflow deflector with the tabs of theinlet valve body away from the inlet valve disk. If it is install improperly, the mask will leak.

7. Check that inlet valve body (8) is installed on the post of the airflow deflector with the tabs (7) of the inlet valvebody away from the airflow deflector (3).

8. Position airflow deflector in pocket on opposite side of mask assembly.

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2-13. LEFT/RIGHT HOSE ASSEMBLY CONVERSION (CONT)CAUTION

DO NOT pull on spokes of valve body while installing. This will break the spokes and requirereplacement of the valve body.

9. With one hand push valve body (8) through sideport (9). With other hand pull on thick outer rim (14) of valvebody until valve body is completely through sideport.

10. Push buttons (6) on sides of airflow deflector (3) into button holes (15) in mask assembly pocket.

11. Press lightly around thick outer rim of valve body until the valve body seats in the sideport housing.

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12. Install hose (1) by turning star knob (2) clockwise.

WARNING

Be sure the side voicemitter is installed with the flange and four beads facing out. If installedincorrectly it could cause the mask assembly to leak.

13. Position gasket (13) in sideport (9).14. Install side voicemitter (12) with four beads (16) facing out..15. Position side voicemitter retainer (10) in sideport.

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2-13. LEFT/RIGHT HOSE ASSEMBLY CONVERSION (CONT)

16. Tighten voicemitter retainer (10) by turning clockwise with the D-ring (11) on the mask carrier strap.17. Check for proper function (para 2-8).

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SECTION VII. MAINTENANCE PROCEDURES2-14. GENERALThe maintenance procedures in this section are to be performed by a unit maintenance technician or by the user underunit maintenance supervisor. This section contains detailed instructions for replacing the following components.

Para. Page

Facepiece Assembly2-15. INTERNAL DRINK TUBE ............................................................................................................... 2-402-16. QUICK DISCONNECT COUPLING, EXTERNAL DRINK TUBE ...................................................... 2-422-17. HEAD HARNESS ........................................................................................................................... 2-432-18. SECOND SKIN .............................................................................................................................. 2-442-19. UNIVERSAL SECOND SKIN .......................................................................................................... 2-462-20. UNIVERSAL SECOND SKIN (USMC only) ..................................................................................... 2-482-21. NOSECUP VALVE DISKS ............................................................................................................. 2-502-22. AIRFLOW DEFLECTOR, INLET VALVE, AND VALVE BODY ........................................................ 2-512-23. OUTLET VALVE COVER AND OUTLET VALVE DISK .................................................................. 2-552-24. MICROPHONE ............................................................................................................................... 2-572-25. DETACHABLE MICROPHONE ....................................................................................................... 2-582-26. SIDE VOICEMITTER, VOICEMITTER RETAINER, AND GASKET ................................................ 2-59

Canister Carrier2-27. CANISTER COVER ........................................................................................................................ 2-602-28. ARMOR QUICK DISCONNECT (AQD) .......................................................................................... 2-61

Hose Assembly2-29. CLAMP COVER ............................................................................................................................. 2-622-30. PORT GASKET ............................................................................................................................. 2-63

Optical Equipment2-31. OPTICAL INSERT KIT ................................................................................................................... 2-64

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-15. INTERNAL DRINK TUBE

THIS TASK COVERS: a. Removal b. Installation c. Checking for Fit

INITIAL SETUP

Applicable Configurations:M42 / M42AI / M42A2

Materials / Parts:Shears (item 14, app D)

a. REMOVAL

CAUTION

Do not scratch plastic eyelens while performing maintenance procedures.

1. Lay mask assembly (1) face down on non-abrasive surface.

2. Grasp internal drink tube (2) at drink tube coupling (3) and pull internal drink tube away from coupling.

b. INSTALLATION

1. Lay mask assembly face down on non-abrasive surface..

2. Install internal drink tube on drink tube coupling and press internal drink tube until it bottoms fully against drinktube coupling.

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c. CHECKING FOR FIT

CAUTION

Internal drink tube will irritate lips if it touches them while wearing maskassembly.

Internal drink tube must be removed from mask assembly prior toadjusting length to prevent damage to mask assembly.

NOTE

Slight pressure on front voicemitter should enable the internal drink tubeto be grasped by the soldier's lips.

1. Have soldier put on mask assembly and check to see if internal drink tube touches lips.

2 If internal drink tube (2) touches soldier's lips while wearing mask assembly (1), adjust length of internal drinktube as follows:

a. Remove internal drink tube from mask assembly.b. Cut internal drink tube behind first barb (4).c. Install internal drink tube.

CAUTION

DO NOT remove the last barb, as this is needed for proper function.

3. Repeat steps I and 2 as necessary to achieve proper fit.

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2-16. QUICK DISCONNECT COUPLING, EXTERNAL DRINK TUBE

THIS TASK COVERS: a. Removal b. Installation

INITIAL SETUP

Applicable Configurations:M42A1 /M42A2

a. REMOVAL

1. Lay mask assembly (1) face up.2. Remove quick disconnect coupling (2) from retainer (3).3. Grasp external drink tube (4) where it joins the quick disconnect coupling, with one hand, and with the other,

grasp the quick disconnect coupling and pull away with a twisting motion, disengaging the external drink tubefrom the quick disconnect coupling.

b. INSTALLATION

NOTEQuick disconnect tube connection may be moistened with water to aid incoupling it with the rubber tubing.

1. Lay mask assembly face up.2. Insert quick disconnect coupling into the external drink tube and, with a twisting motion, press drink tube in place.

Ensure hose extends over the nipple end of the quick disconnect 5/8 - 3/4 inch.3. Verify drink system for leaks in accordance with para 2-9.4. Re-install quick disconnect coupling in retainer.5. Check for leaks in accordance with para 2-9.

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2-17. HEAD HARNESS


INITIAL SETUP:

Applicable Configurations:M42 / M42A 1 / M42A2

a. REMOVAL

CAUTION


• Work head harness straps (1) out of buckles (2).

b. INSTALLATION

NOTEElastic webbing that joins the two forehead straps must be on outside toavoid hot spots on head.

1. Position head harness (3) in mask assembly (4) with head harness straps next to buckles.2. Work head harness straps into buckles and pull through approximately I in. (2.5 cm) so that head harness strap

ends are outside.3. Stretch head harness away from mask assembly and check that buckles hold head harness straps tightly.4. Perform Initial Fitting Procedures. (para 2-7)

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2-18. SECOND SKIN


INITIAL SETUP:

Applicable Configurations:M42A 1 /M42A2

a. REMOVAL

CAUTION

Do not scratch plastic eyelens while performing maintenanceprocedures. Avoid over-stretching holes in the second skin.

1. Remove quick doff hood (if applicable), outserts, hose assembly, outlet valve cover and detachable microphone(M42A2), disconnect microphone cord (M42AI) from mask assembly. (See Operator's Manual)

2. Stretch eyelens openings (1) of the second skin (2), and pull the second skin from the mask assembly (3).3. Stretch side voicemitter opening (4) of the second skin, and pull the second skin from the mask assembly.4. Stretch the other side voicemitter opening (5) of the second skin, and pull the second skin from the mask

assembly.5. Stretch front voicemitter opening (6) of the second skin, and pull the second skin from the mask assembly.

CAUTION

To prevent tearing the outlet valve body opening of second skin, becareful pulling over flanges on outlet valve body.

6. Stretch outlet valve body opening (7) of the second skin, and pull the rest of the second skin from the maskassembly.

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b. INSTALLATION

1. Orient the second skin (2) with ridge (8) and rubber catches (9) facing outward.2. Feed the external drink tube (10) through the outlet valve body opening (7) on the second skin.

CAUTION

Avoid over-stretching holes in the second skin. To prevent tearing theoutlet valve body opening of the second skin, be careful pulling overflanges on outlet valve body.

NOTE

There are two side openings on the second skin. One fits over the sidevoicemitter. The other side opening on the second skin fits over the sideport (where the hose is attached).

3. Stretch outlet valve body opening of the second skin, and position it over the outlet valve body (11) on maskassembly (3).

4. Stretch side voicemitter opening (4) of the second skin, and position it over the side voicemitter (12) (hiddenfrom view) of the mask assembly.

5. Stretch the other side voicemitter opening (5) of the second skin, and position it over the side port (13) of themask assembly.

6. Stretch front voicemitter opening (6) of the second skin, and position it over the front voicemitter (14) of themask assembly.

7. Stretch eyelens openings (1) of the second skin, and position them over the eyelenses (15) on the maskassembly.

8. Install outserts, detachable microphone (M42A2), reconnect microphone cord (M42A1), outlet valve cover, quickdoff hood, hose assembly with canister carrier assembly. (See Operator's Manual)

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-19. UNIVERSAL SECOND SKIN


INITIAL SETUP:

Applicable Configurations:M42AI / M42A2

a. REMOVAL

CAUTION

Do not scratch plastic eyelens while performing maintenanceprocedures. Avoid over-stretching holes in the universal second skin.

1. Remove quick doff hood (if applicable), outserts, hose assembly, outlet valve cover and detachable microphone(M42A2), disconnect microphone cord (M42A1) from mask assembly. (See Operator's Manual)

2. Stretch eyelens openings (1) of the second skin (2), and pull the second skin from the mask assembly (3).3. Stretch side voicemitter opening (4) of the second skin, and pull the second skin from the mask assembly.4. Stretch the other side voicemitter opening (5) of the second skin, and pull the second skin from the mask

assembly.5. Stretch front voicemitter opening (6) of the second skin, and pull the second skin from the mask assembly.

CAUTION

To prevent tearing the outlet valve body opening of second skin, becareful pulling over flanges on outlet valve body.

6. Stretch outlet valve body opening (7) of the second skin, and pull the rest of the second skin from the maskassembly.

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TM 3-4240-343-20&PTM 09205A - 20&P/2

b. INSTALLATION

1. Orient the universal second skin (2) with the ridge (8) facing outward.

2. Feed the drink tube (9) through the outlet valve body opening (7) on the universal second skin.

CAUTION

Avoid over-stretching holes in the universal second skin. To preventtearing the outlet valve body opening of the universal second skin, becareful pulling over flanges on outlet valve body.

NOTE

There are two side openings on the universal second skin. One fits overthe side voicemitter. The other side opening on the universal secondskin fits over the side port (where the hose is attached).

3. Stretch outlet valve body opening of the universal second skin, and position it over the outlet valve body (11) onmask assembly (3).

4. Stretch side voicemitter opening (4) of the universal second skin, and position it over the side voicemitter (12)(hidden from view) of the mask assembly.

5. Stretch the other side voicemitter opening (5) of the universal second skin, and position it over the side port (13) ofthe mask assembly.

6. Stretch front voicemitter opening (6) of the universal second skin, and position it over the front voicemitter (14) of themask assembly.

7. Stretch eyelens openings (1) of the universal second skin, and position them over the eyelenses (15) on the maskassembly.

8. Install outserts, detachable microphone (M42A2), reconnect microphone cord (M42AI), outlet valve cover, quick doffhood, hose assembly with canister carrier assembly. (See Operator's Manual)

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2-20. UNIVERSAL SECOND SKIN (USMC only)


INITIAL SETUP

Applicable Configurations:M42/M42A1 / M42A2

a. REMOVAL

CAUTION

Do not scratch plastic eyelens while performing maintenanceprocedures. Avoid over-stretching holes in the universal second skin(USMC only).

1. Remove outserts, hose assembly, and detachable microphone (M42A2), disconnect microphone cord(M42/M42A 1) from mask assembly (See Operator's Manual).

2. Unfasten flaps (1) with hook and pile fasteners (2) from lower portion of universal second skin (USMC only) (3).3. Stretch eyelens openings (4) of the universal second skin (USMC only) from eyelenses (5) of mask and pull

universal second skin (USMC only) from mask assembly (6).4. Stretch front voicemitter opening (7) of universal second skin (USMC only), and pull universal second skin

(USMC only) from mask assembly.5. Stretch side voicemitter opening (8) of universal second skin (USMC only) and pull universal second skin (USMC

only) from mask assembly.6. Stretch the other side voicemitter opening (9) of universal second skin (USMC only) and pull universal second

skin (USMC only) from mask assembly.7. Carefully remove universal second skin (USMC only) from mask assembly without removing the outlet valve

cover (10).

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b. INSTALLATION

1. Orient the universal second skin (USMC only) (3) with the hook and pile fasteners (2) of the flaps (1) facinginward.

CAUTIONAvoid over-stretching holes in the universal second skin (USMC only).

NOTE

There are two side openings on the universal second skin (USMC only).One fits over the side voicemitter. The other side opening on theuniversal second skin (USMC only) fits over the side port (where thehose is attached).

2. Install the universal second skin (USMC only) over outlet valve cover (10) of mask assembly (6).

3. Stretch side voicemitter opening (8) of the universal second skin (USMC only), and position it over the sidevoicemitter (11 ) (hidden from view) of the mask assembly.

4. Stretch the other side voicemitter opening (9) of the universal second skin (USMC only), and position it over theside port (12) of the mask assembly.

5. Stretch front voicemitter opening (7) of the universal second skin (USMC only), and position it over the frontvoicemitter (13) of the mask assembly.

6. Stretch eyelens openings (4) of the universal second skin (USMC only), and position them over the eyelenses (5)of the mask assembly.

7. Fasten flaps with hook and pile fasteners to lower portion of universal second skin (USMC only).

8. Install outserts, detachable microphone (M42A2), reconnect microphone cord (M42AI), hose assembly, andcanister carrier assembly. (See Operator's Manual)

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-21. NOSECUP VALVE DISKS


INITIAL SETUP:


a. REMOVALCAUTION

Do not scratch plastic eyelens while performing maintenanceprocedures. To avoid tears, do not stretch rubber more than necessaryto remove or install parts.

1. Pull head harness (1) over front of mask assembly (2).

2. Curl back lip of nosecup (3) to expose nosecup valve seat (4) and valve disk (5).

3. Pull nosecup valve disk out of each nosecup valve seat from inside of nosecup.

b. INSTALLATIONNOTE

It may be necessary to pull on nosecup valve disk stem from outside ofnosecup while pressing it into the nosecup valve seat from inside ofnosecup. Moisten the stem of nosecup valve disks with water to aid ininstallation.

1. Press nosecup valve disk into nosecup valve seat from inside of nosecup until nosecup valve disk is flat againstnosecup valve seat and the stem (6) slips completely through the hole (7) in the nosecup valve body.

2. Gently rotate nosecup valve disk to make sure it is completely seated.3. Repeat steps 1. and 2. to install remaining nosecup valve disk.4. Return head harness to its original position.

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-22. AIRFLOW DEFLECTOR, INLET VALVE, AND VALVE BODY


INITIAL SETUP:


Equipment Condition:Hose removed (M42A1/M42A2)Canister carrier removed (M42A1/M42A2)Hood removed (M42)Quick Doff Hood Removed (M42A 1/M42A2)

a. REMOVAL

CAUTION

Do not scratch plastic eyelens while performing maintenanceprocedures. Be careful when disconnecting buttons. The maskassembly may be damaged if care is not exercised.

1. Disconnect the airflow deflector (1) from mask assembly (2) by carefully pulling the silicon rubber housing awayfrom the airflow deflector buttons (3).

2. Grasp a tab (4) on inlet valve body (5) and pull toward center of inlet valve body until unseated from sideport (6).

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2-22. AIRFLOW DEFLECTOR, INLET VALVE, AND INLET VALVE BODY (Cont)

a REMOVAL (Cont)

3. Tuck unseated portion of inlet valve body (5) into the mask assembly. Remove airflow deflector (I) from maskassembly (2).

4. Grasp inlet valve body with thumb under two spokes (7). Pull and peel off airflow deflector post (8).

5. Pull inlet valve disk (9) from airflow deflector post.

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b. INSTALLATIONWARNING

Be sure the inlet valve body is installed on the post of the airflowdeflector with the tabs of the inlet valve body away from the inlet valvedisk. If it is install improperly, the mask will leak.

NOTE

There are two sizes of deflectors. Ensure that the deflector sizematches the mask size.

1. Position inlet valve disk (9) on lower groove (10) of airflow deflector post (8).

2. Position the inlet valve body (5) on the airflow deflector post. Be sure that the tabs (4 ) of the inlet valve bodyface away from the inlet valve disk.

3. Position airflow deflector (1) in pocket on side of mask assembly.

CAUTION

DO NOT pull on spokes of inlet valve body while installing. This willbreak the spokes and require replacement of the inlet valve body.

4. With one hand push inlet valve body through sideport (6). With other hand pull on thick outer rim (11) of inletvalve body until inlet valve body is completely through sideport.

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-22. AIRFLOW DEFLECTOR, INLET VALVE, AND INLET VALVE BODY (Cont)

b. INSTALLATION (Cont)

5. Push buttons (3) on sides of airflow deflector (1) into button holes (12) in mask assembly pocket.

6. Press lightly around thick outer rim (11) of inlet valve body (5) until the inlet valve body seats in the sideporthousing.

7. Check for Proper Function (para 2-8).

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-23. OUTLET VALVE COVER AND OUTLET VALVE DISK


INITIAL SETUP:


a. REMOVAL

CAUTION

Do not scratch plastic eyelens while performing maintenanceprocedures. Do not damage cover when removing outlet valve cover.

1. Pull quick disconnect coupling (1) out of retainer (2) on outlet valve cover (3).

2. Pull up on drink tube retainer (4) on bottom of outlet valve cover until outlet valve cover is disengaged fromoutlet valve body (5).

3. Remove outlet valve cover from flanges (6) on top of outlet valve body.

4. Pull outlet valve disk (7) out of outlet valve body and discard.

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TM 3-4240-343-20&PTM 09205A - 20&P12

2-23. OUTLET VALVE COVER AND OUTLET VALVE DISK (CONT)

b. INSTALLATION

CAUTION

Do not use any tools or instruments to install outlet valve disk.Damage to valve seat may occur which would cause leakage.

NOTE

Moisten stem of outlet valve disk with water to aid installing outlet valvedisk into outlet valve body.

1. Start stem (8) of outlet valve disk (7) through hole (9) in middle of outlet valve body (5).2. Press outlet valve disk in while pulling on the inside stem of the outlet valve disk until shoulder of stem slips

through hole in outlet valve body.3. Check that outlet valve disk lies flat and smooth and has continuous contact with outlet valve seat4. Rotate outlet valve disk with finger to make sure it is properly seated.5. Install outlet valve cover (3) on flanges (6) on top of outlet valve body.6. Using drink tube retainer (4) on bottom of outlet valve cover, pull outlet valve cover over face of outlet valve

body. Made sure outlet valve cover snaps in place around outlet valve body.7. Install quick disconnect coupling (1) securely in retainer (2). Fasten external drink tube (10) to drink tube

retainer.8. Check for Proper Function (para 2-8).

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-24. MICROPHONE


INITIAL SETUP:

Applicable Configurations:M42 / M42A 1

Tools:Screwdriver (item 13, app D)

a. REMOVAL

CAUTION


1. Fold head harness (1) over front of mask assembly (2).

2. Pull microphone (3) toward you, remove two screws (4). Loosen set screws (5) and pull microphone fromconnector (6).

3. Dispose of microphone.

b. INSTALLATION

NOTEMake sure microphone is installed as shown.

1. Position microphone on connector. Tighten set screws. Install and tighten two screws.2. Return microphone and head harness to their original positions.

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2-25. DETACHABLE MICROPHONE


INITIAL SETUP:

Applicable Configurations:M42A2

a. REMOVAL

1. Hold the mask assembly (1) in your hand with the front voicemitter (2) facing you.

2. Place index finger on either side of the detachable microphone at the 3:00 position (3) or 9:00 position (4). Applya sideward force until extracted.

b. INSTALLATION

1. Hold mask assembly in your hand with the front voicemitter facing you.

2. Hold detachable microphone clip (5) in your other hand with the ring opening facing down, and the flat surfacefacing toward the facepiece.

3. Insert the clip into the voicemitter housing (6) open end first with the cord (7) facing the six o'clock position.

4. Snap the clip into place, making sure it is flush against the front voicemitter.

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2-26. SIDE VOICEMITTER, VOICEMITTER RETAINER, AND GASKET


INITIAL SETUP:

Applicable ConfigurationsM42/m42a1/m42a2

a. REMOVAL

CAUTION


1. Remove side voicemitter retainer (1) by unscrewing counterclockwise using the D-ring (2) on the mask carrier strap.

2. Remove the side voicemitter (3) and gasket (4) by pushing from inside of mask out of the side port (5).

b. INSTALLATION

WARNING

Be sure the side voicemitter is installed with the flange and four beads facing out. If installed incorrectly it could causethe mask assembly to leak.

1. Position gasket in sideport of mask assembly (6).

2. Install side voicemitter in sideport, with four beads (7) facing out.

3. Position side voicemitter retainer in sideport; tighten with D-ring on mask carrier strap by turning clockwise until themask distorts.

4. Check for proper function (para 2-8).

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2-27. CANISTER COVER


INITIAL SETUP:

Applicable Configurations:M42A2

a REMOVAL

Remove canister cover (1) by pressing in and rotating counterclockwise.

b. INSTALLATION

Install canister cover on canister carrier (2) and press in on cover while rotating clockwise until locked in place.

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2-28. ARMOR QUICK DISCONNECT (AQD)


INITIAL SETUP:

Applicable Configurations:

M42A1 /M42A2

a REMOVAL

1. Turn the lever (1) counterclockwise to uncover red marking (2) indicating unlocked position.

2. Pull out the AQD (3) from the canister carrier cover (4).

b INSTALLATION

1. Position AQD to the canister carrier inlet opening (5).

2. Make sure that the AQD is unlocked. If red mark shows on the side of AQD, it is unlocked.

3. Snap AQD to the canister carrier cover.

4. Turn lever clockwise to lock in place.

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2-29. CLAMP COVER


INITIAL SETUP:


a REMOVAL

1. Pull up on flange of clamp cover (1) and work clamp cover free from hose (2).

2. Work clamp cover off end of hose.

b INSTALLATION

1. Work clamp cover over end of hose.

2. Pull up on flange of clamp cover and position clamp cover over hose. Make sure that clamp cover fully coversend of hose.

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2-30. PORT GASKET


INITIAL SETUP:


a REMOVAL

1. Remove filter canister. (See Operator's Manual)

2. Remove gasket (1) from hose end (2).

b INSTALLATION

1. Install gasket in hose end. Make sure gasket is fully seated in hose end.

2. Install filter canister. (See Operator's Manual)

3. Check for proper function (para 2-8).

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2-31. OPTICAL INSERT KIT

THIS TASK COVERS: a. Optical Inserts (Wire) b. Optical Inserts (Plastic)Removal RemovalInstallation Installation

Adjustment

INITIAL SETUP:


Tools:Screwdriver (item 13, app D)

a OPTICAL INSERTS (WIRE)

REMOVAL

Grasp center of wire frame (1) and pull from mask assembly (2).

INSTALLATION

NOTERemove neutral gray protective outserts prior to installing or adjustingoptical insert.

Remove hood and pull head harness over the front of the mask.

1. Place wire optical inserts (3) in mask assembly with tips of upper portion (4) of wire frame pointing toward you.2. Insert lower portion (5) of wire frame into bottom of lens cavities.

NOTEIf tips of upper portion of the wire frame protrude into the line of sight,bend out of vision field as required.

3. Insert upper portion of wire frame into top of lens cavities.

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NOTEThere are four retainers in each lens opening, one on each side, one atthe top and one at the bottom.

4. Locate the four retainers (6) within each lens opening (External view of mask lens opening is provided for clarity).

5. Ensure that wire frame is seated behind the four retainers in each lens opening.

b. OPTICAL INSERTS (PLASTIC)

REMOVAL

1. For routine removal:

a. Fold one lens up and loosen lens carrier set screw (7).b. Fold other lens up and loosen second lens carrier set screw (8).c. Remove lens carrier (9) from mount frame (10) by sliding up.d. Grasp the mount frame at the center (11) and pull to remove.

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2-31. OPTICAL INSERT KIT (Cont)

b. OPTICAL INSERTS (PLASTIC) (Cont)

REMOVAL (Cont)

2. For non-routine removal:

Grasp the lens carrier (9) and pull from the mask. If the lens carrier separates from the mount frame (10), graspthe center (11) of the mount frame and pull to remove.

INSTALLATION

NOTE

Remove neutral gray protective outserts prior to installing or adjustingoptical insert. Remove hood and pull head harness over the front themask.

Some masks have smaller lens wells and will require extra effort inaligning and connecting the hoop ends.

1. Place the mount frame into the mask assembly (2).2. Position the center block between the mask lenses, and press into place on bridge of mask.

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NOTEThere are four retainers in each lens opening, one on each side, one atthe top and one at the bottom.

3. Locate the four retainers (6) within each lens opening (External view of mask lens opening is provided for clarity).

4. Ensure that mount frame is seated behind the four retainers in each lens opening.

5. Position mount hoops (12) into the mask lens cavities.6. Turn mask over and do the next step looking through the eyelens.7. Spread apart the top and bottom of the hoops until the ends of the mount hoops lock into place.

NOTEBefore attempting to install the prescription lens carrier, loosen the setscrews until the points are flush with the surface of the mount block.

8. The lens carrier (9) is installed by alining the carrier's mounting block (13) with the groove (14) of the mountframe (10) and sliding the carrier into place.

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2-31. OPTICAL INSERT KIT (Cont)

b. OPTICAL INSERTS (PLASTIC) (Cont)

ADJUSTMENT

1. The vertical height of the lens carrier (9) can be adjusted by sliding the carrier upward or downward.

CAUTION

Do not over tighten the set screws or the lens carrier will pop out duringuse.

2. Following adjustment, secure the lens carrier by tightening the set screws until contact is made with the mount frame(10).

a. Fold the lens carrier to one side and tighten the set screw (7).b. Fold the lens carrier to the other side and tighten the second set screw (8).

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SECTION VIII. CLEANING AND SANITIZING2-32. CLEANING

THIS TASK COVERS: a. Cleaning mask assembly b. Cleaning mask carrier

INITIAL SETUP:


References:TM 3-4240-340-10TM 3-4240-300-10-2TM 3-4240-343-10

Materials/Parts:Cheesecloth (item 7, app D)Gloves (item 8, app D)Isopropyl alcohol (item 9, app D)Lens brush (item 2, app D)Optical lens cleaning compound (item 6, app D)Pail (item 12, app D)Scrub brush (item 3, app D)Soap (item 15, app D)

a. CLEANING MASKASSEMBLYCAUTION

DO NOT use hot or boiling water to clean the mask. Damage to the mask may result. Use warm(comfort- able to the touch) water.

NOTEMasks are to be cleaned as often as is required. However, MASK MUST BE CLEANED ANDSANITIZED BEFORE TRANSFERRING TO ANOTHER SOLDIER Use only potable water to cleanmask. Cleaning may be performed by the operator but must be closely supervised andinspected by the NBC NCO or other trained personnel.

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2-32. CLEANING (CONT)

a. CLEANING MASKASSEMBLY (CONT)

1. Remove mask assembly from the mask carrier.

2. M42 mask.a. Remove canister carrier from hose, outserts, and hood (see operator's manual).b. Remove microphone cord (para 2-23) and outlet valve cover (para 2-22).

3. M42A1 mask.a. Remove canister carrier, hose, quick doff hood, second skin and outserts (see operator's manual) or universal

second skin (para 2-18), or universal second skin (USMC only) (para 2-19).b. Remove microphone cord (para 2-23) and outlet valve cover (para 2-22).

4. M42A2 mask.a. Remove canister carrier, hose, quick doff hood, second skin and outserts (see operator's manual) or universal

second skin (para 2-18), or universal second skin (USMC only) (para 2-19).b. Remove detachable microphone (para 2-24) and outlet valve cover (Para 2-22).

5. Remove greasy or oily substances from facepiece (1) with isopropyl alcohol on a cheesecloth (item 7, app D).6. Dip cheesecloth in warm soapy water and wring cloth almost dry. Lens brush may also be used. Clean

facepiece, second skin (2) (M42AI/M42A2), quick doff hood (3) (M42A 1 / M42A2) or universal second skin (4) oruniversal second skin (USMC only) (5), outlet valve cover (6), canister carrier (7), microphone cord (8) (M42 /M42A1), detachable microphone (9) (M42A2), and one piece hood (10) (M42) inside and out with the cheesecloth(item 7, app D).

7. Rinse by wiping with cheesecloth (item 7, app D) that has been dipped in warm clear water and wrung almost dry8. Dry facepiece, second skin (M42A1/M42A2), quick doff hood (M42A1 / M42A2) or universal second skin or

universal second skin (USMC only), outlet valve cover, canister carrier, microphone cord (M42/M42A 1),detachable microphone (M42A2), and one piece hood (M42) with cheesecloth (item 7. and D) or allow to air dry

9. Wipe outside of hose (11) with isopropyl alcohol (item 9, App D) on a cheesecloth.2-70

TM 3-4240-343-20&PTM 09205A - 20&P/2

10. Clean eye lens (12) and outserts (13) with optical lens cleaning compound (item 6, app D).

NOTEIf you are sanitizing the mask. DO NOT reinstall any components. Go to paragraph 2-32,Sanitizing mask.

11 Install second skin (2) (M42A 1/M42A2) (para 2-17) and quick doff hood (3) (M42A 1 / M42A2) (See Operator'sManual) or universal second skin (4) (M42A1/M42A2) (para 2-18) or universal second skin (USMC only) (5) (para2-19) when used with hooded overgarment.

12. Install clear outserts (See Operator's Manual).13. Install outlet valve cover (para 2-22).14. Install one piece hood (M42), if required, (See Operator's Manual).15. Install canister carrier and hose assembly (M42A1/M42A2). (See Operator's Manual).16. Install microphone cord (M42 / M42A 1) (para 2-23), and detachable microphone (M42A2) (para 2-24).

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2-32. CLEANING (CONT)

b. CLEANING MASK CARRIERCAUTION

Do not use hot water, bleach, or detergents, or soak or immerse mask carrier to clean it.

1. Empty pockets and contents from combat vehicle mask carrier (14) or field mask carrier (15).2. Shake combat vehicle mask carrier or field mask carrier upside down to remove dirt and foreign matter.3. Soak brush (item 3, app D) in pail (item 12, app D) of cool water.4. Shake brush (item 3, app D) to remove excess water.5. Clean combat vehicle mask carrier or field mask carrier with brush (item 3, app D) and cool water.

NOTEIf you are sanitizing the mask, do not repack the mask carrier.

6. Insure combat vehicle mask carrier or field mask carrier and mask components are completely dry beforerepacking mask.

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2-33. SANITIZING

THIS TASK COVERS: Sanitizing mask assembly

INITIAL SETUP:

Applicable Configurations:M42/M42A1 /M42A2

References:TM 3-4240-340-10TM 3-4240-300-10-2

TM 3-4240-343-10

Materials/Parts:Head HarnessInternal Drink TubeOutlet Valve DiskCalcium Hypochlorite (item 5, app D)Cheesecloth (item 7, app D)Gloves (item 8, app D)Pail (item 12, app D)

SANITIZING MASK ASSEMBLYWARNING

Wear gloves to protect hands.

NOTE

When you sanitize a mask, use only potable water. Sanitizing is required before mask istransferred to another soldier and when the mask is turned in as serviceable excess.

Sanitizing may be performed by the operator but must be closely supervised and inspected bythe NBC NCO or other trained personnel.

THE MASK MUST BE CLEANED PRIOR TO SANITIZING. GO TO PARAGRAPH 2-30, CLEANINGMASKAND MASK CARRIER.

1. Remove head harness (para 2-16) and discard.2. Remove airflow deflector, inlet valve disk and inlet valve body (para 2-21)3. Remove nosecup valve disks. (para 2-20).

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-33. SANITIZING (CONT)SANTIZING MASKASSEMBLY (CONT)

NOTEDO NOT remove internal drink tube if mask is to be retained by the same soldier. Sanitizeinstalled internal drink tube using steps 7 through 20. Remove and discard the internal drinktube only if the mask is to be reissued to another soldier.

4. Remove internal drink tube (para 2-14) and discard.5. Remove outlet valve disk (para 2-22 ) and discard.

CAUTIONSet microphone cord (M42 / M42A1), detachable microphone (M42A2) aside so that they will notget wet or damaged.

NOTEPrepare enough sanitizing solution to cover facepiece.

6. Add level Y2 teaspoon of calcium hypochlorite (item 5, app D) to each gallon of clean water in a utility pail (item12, app D).

7. Mix thoroughly for 30 seconds to dissolve calcium hypochlorite.8. Remove M1 canteen cap (1) and fill canteen (2) with this solution and put M canteen cap on canteen.9. Save the rest of the solution for sanitizing the facepiece (3).

10. Open protective cover on M canteen cap. Position facepiece face-up.11. Attach quick disconnect coupling (4) to Ml canteen cap.12. Invert canteen above facepiece. Squeeze canteen to force the sanitizing solution through the quick disconnect

coupling.13. Lower canteen to upright position or squeeze sides to vent canteen. Use entire contents and rinse twice with

clear water in the same manner.

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TM 3-4240-343-20&PTM 09205A - 20&P/2

14. Immerse facepiece (3), outserts (5), airflow deflector (6), outlet valve cover (7), one piece hood (8) (M42),second skin (9) (M42A1/M42A2) and quick doff hood (10) (M42A 1/ M42A2) or universal second skin (11) (M42A1/M42A2) or universal second skin (USMC only) (12) and agitate for 5 minutes in sanitizing solution.

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2-33. SANITIZING (CONT)

SANTIZING MASKASSEMBLY (CONT)

15. Rinse twice in clear warm water, agitating 2 or 3 minutes each time.16. Connect MI canteen cap (I) to the quick disconnect coupling (4) to drain excess water.17. Dry all parts with cheesecloth (item 7, app D) or allow to air dry.

NOTEDiscard head harness, outlet valve disks, and internal drink tube and replace with new parts.

CAUTIONInsure all the mask components are completely dry before reassembling mask.

18. Install head harness (para 2-16).19. Install inlet valve disk, inlet valve body, and airflow deflector (para 2-21).20. Install outlet valve disk (para 2-22).21. Install nosecup valve disk (para 2-20).22. Install internal drink tube (para 2-14).23. Install remaining items on mask and repack mask carrier (Operator's Manual).

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TM 3-4240-343-20&PTM 09205A - 20&P/2

SECTION IX. PREPARATION FOR STORAGE OR SHIPMENT

2-34. PREPARATION FOR STORAGE OR SHIPMENT

CAUTIONStore masks in a cool, dry place. Heat and moisture will damage the mask and the filter material.

a. Storage by Using Unit. Use either the fiberboard boxes or the plywood boxes for unit storage by stacking themontheir sides to form a bank of storage cells. Fiberboard boxes should not be stacked more than three high.

b. Faceform. Replace interior plastic faceform packaging support if mask will be stowed longer than 30 days.c. Temporary Storage by Using Unit.

1. Hang the carrier either by the shoulder strap or by the D-ring on the short strap on top of the carrier.2. Stow straps as directed by the local commander. Both straps may be hooked to the D-ring by their snap

hooks.d. Shipment.

WARNINGHEALTHENVIRONMENTAL HAZARD There are two Mask Filter Canisters, the C2 and the C2A1.

The C2 canister contains Chromium VI and damaged or unusable canisters are consideredHazardous Waste. (Chromium VI is a known carcinogen if in haled or swallowed.) The C2A 1Icanister is chromium-free but must continue to be disposed of in accordance with State andLocal Environmental Laws.

DO NOT throw away damaged or unusable canisters as ordinary trash.

DO turn in damaged or unusable canisters to your hazardous waste management office orDefense Reutilization and Marketing Office (DRMO).

CAUTIONPackage mask carefully to prevent damage during shipment.

1. Clean masks (para 2-31).2. Do not ship canister with mask. Turn canisters in to DRMO or, in accordance with state and local environmental

laws, unit SOP, for disposal.3. Install clear outserts onto lens of mask facepiece. Place operator's manual into a ziplock bag and close. Stow

other outserts, waterproof bag and packaged operator's manual in inside pockets of carrier.4. Pull hood over the front of the mask facepiece.5. Loosen head harness straps and install packaging faceform into mask facepiece cavity. Tighten the head

harnessstraps evenly around faceform.

6. Wrap mask facepiece with one complete turn of cushioning material (item 19 app. D). Overlap and secure endswith tape (item 20, app. D).

7. Install wrapped mask facepiece in the carrier with lenses facing upward and close flaps tightly.

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TM 3-4240-343-20&PTM 09205A - 20&P/2

2-34. PREPARATION FOR STORAGE OR SHIPMENT (CONT)

8. Place, carriers, packaged as above, (maximum 8 each) in one layer into a weather-resistant shipping container(item 18, app. D) or equivalent. The voids in box shall be filled with cushioning material (item 19, app. D).

9. Pack the shipping container into a wooden shipping container (item 18, app. D). Use six cleated box fastenersto secure box lid, applying two on each side and one on each end.

10. Secure a shipping document envelope on the side on the shipping container with an enclosed DD Form 134 foreach NSN being shipped (AR 725-50, See II, Par 7-11).

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TM 3-4240-343-20 & PTM 09205A-20 & P/2

APPENDIX A

REFERENCES

A-1. SCOPE

This appendix lists all forms, field manuals, technical manuals, and miscellaneous publications referenced in this manual.

A-2. FORMS

DD Form 314 .............................................................................Preventive Maintenance Schedule and RecordSF 368 ........................................................................................Product Quality Deficiency ReportDA Form 2028-2 .........................................................................Recommended Changes to Equipment Technical

PublicationsDA Form 2028.............................................................................Recommended Changes to Publications and

Blank FormsSF 364 ........................................................................................Report of Discrepancy (ROD)DA Form 2404.............................................................................Equipment Inspection and Maintenance

WorksheetNAVMC Form 10772...................................................................Recommended Change to Publications/Logistics-Maintenance Data Coding

A-3. FIELD MANUALS

FM 3-4 ........................................................................................NBC ProtectionFM 21-11 ....................................................................................First Aid for Soldiers

A-4. TECHNICAL MANUALS

TM 3-4240-300-10-2 ...................................................................Chemical-Biological Mask: Combat Vehicle M42TM 3-4240-340-10.......................................................................Chemical-Biological Mask: Combat Vehicle

M42A 1TM 3-4240-343-10 ......................................................................Chemical-Biological Mask: Combat Vehicle

M42A2TM 43-0002-31............................................................................Destruction of Chemical Weapons and Defense

Equipment to Prevent Enemy UseTM 4700-15/1..............................................................................Ground Equipment Record Procedures

A-5. TRAINING MATERIALS

TVT 3-95.....................................................................................M40/M42 Protective Mask Unit Level OperationsPIN 710665 - Video Tape

TVT 3-96 ....................................................................................M40/M42 Protective Mask Operator LevelOperations - PIN 710719 - Video Tape

TVT 3-90 ....................................................................................M4 1 Protection Assessment Testing System(45 minutes) - PIN 710502 - Video Tape

TVT 3-97 ....................................................................................M41 Protection Assessment Testing System(9.5 minutes) - PIN 7104 11 - Video Tape

A-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

A-6. MISCELLANEOUS

AR 700-84 ..................................................................................Issue and Sale of Personal ClothingCTA 8-100 ..................................................................................Army Medical Department Expendable/Durable

ItemsCTA 50-970 ................................................................................Expendable/Durable Items (Except Medical, Class

V, Repair Parts, and Heraldic items)MIL-STD-129 .............................................................................Marking for Shipment and StorageDA PAM 738-750 .......................................................................The Army Maintenance Management System

(TAMMS)AR 70-38 ....................................................................................Research, Development, Test and Evaluation of

Material for Extreme Climatic ConditionsSB 3-30-2 ...................................................................................Chemical-Biological Canisters and Filter Ele

ments: Serviceability Lists Protection Assessment Test System (Provided with end item,commercial manual)

TC 3-41 ......................................................................................Protection Assessment Test SystemMCO 4855.10 .............................................................................Product Quality Deficiency Report (PQDR)

A-2

TM 3-4240-343-20 & PTM 09205A-20 & P/2

APPENDIX B

MAINTENANCE ALLOCATION CHART (MAC)

SECTION I. INTRODUCTION

B-1. THE MAINTENANCE SYSTEM MAC.

a. This introduction (Section I) provides a general explanation of all maintenance and repair functions authorized atvarious maintenance levels under the standard Maintenance System concept.

b. The Maintenance Allocation Chart (MAC) in Section II designates overall authority and responsibility for theperformance of maintenance functions on the identified end item or component. The application of the maintenancefunctions to the end item or component will be consistent with the capacities and capabilities of the designatedmaintenance levels, which are shown on the MAC in column (4) as:

Unit includes two subcolumns,

C (operator/crew) and O (unit) maintenance.

Direct Support includes an F subcolumn.

General Support includes an H subcolumn.

Depot includes a D subcolumn.

c. Section III lists the tools and test equipment (both special tools and common tool sets) required for eachmaintenance function as referenced from Section II.

d. Section IV contains supplemental instructions and explanatory notes for a particular maintenance function.

B-2. MAINTENANCE FUNCTIONS.

Maintenance functions will be limited to and defined as follows:a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical and /or electrical

characteristics with established standards through examination (e.g., by sight, sound or feel).b. Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical characteristics of

an item and comparing those characteristics with prescribed standards.c. Service. Operations required periodically to keep an item in proper operating condition; i.e. to clean (includes

decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids, orgases.

d. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by settingthe operating characteristics to specified parameters.

e. Align. To adjust specified variable elements of an item to bring about optimum or desired performance.f. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test, measuring,

and diagnostic equipments used in precision measurement. Consists of comparisons of two instruments, one ofwhich is a certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of theinstrument being compared.

g. Remove/Install. To remove and install the same item when required to perform service or other maintenancefunctions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module(component or assembly) in a manner to allow the proper functioning of an equipment or system.

B-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

B-2. MAINTENANCE FUNCTIONS (CONT)

h. Replace. To remove an unserviceable item and install a serviceable counter part in its place. "Replace" isauthorized by the MAC and assigned maintenance level is shown as the 3rd position code of the SMR code.

i. Repair. The application of maintenance services including fault location/troubleshooting, removal/installation,and disassembly/assembly procedures, and maintenance actions to identify troubles and restore serviceability toan item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (componentor assembly), end item, or system.

j. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely serviceable/operational condition as required by maintenance standards in appropriate technical publications (i.e., DMWR).Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not normallyreturn an item to like new condition.

k. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment to a likenew condition in accordance with original manufacturing standards. Rebuild is the highest degree of materielmaintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those agemeasurements (hours/ miles, etc.) considered in classifying Army equipment/components.

B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II.

a. Group Number. (Column(l)). Lists functional group code numbers, the purpose of which is to identifymaintenance significant components, assemblies, subassemblies, and modules with the next higher assembly.

b. Component/Assembly .(Column(2)). Contains the item names of components, assemblies, subassemblies, andmodules for which maintenance is authorized.

c. Maintenance Function. (Column(3)). Lists the functions to be performed on the item listed in column (2).

d. Maintenance Ievel. (Column (4)). Specifies, each level of maintenance authorized to perform each functionlisted in column (3), by indicating work time required (expressed as man-hours in whole hours or decimals) in theappropriate subcolumn. This work-time figure represents the active time required to perform that maintenancefunction at the indicated level of maintenance. If the number or complexity of the tasks within the listedmaintenance function vary at different maintenance levels, appropriate work time figures will be shown for eachlevel. The work time figure represents the average time required to restore an item (assembly, subassembly,component, module, end item, or system) to a serviceable condition under typical field operating conditions.This time includes preparation time (including any necessary disassembly/assembly time), troubleshooting/faultlocation time, and quality assurance/quality control time in addition to the time required to perform the specifictasks identified for the maintenance functions authorized by the Maintenance Allocation Chart.

The symbol designations for the various maintenance levels are as follows:

C Operator or CrewO Unit MaintenanceF Direct Support MaintenanceH General Support MaintenanceL Specialized Repair Activity (SRA) (USMC - Test and

Evaluation Unit (TEU))D Depot Maintenance

e. Tools and Equipment. (Column (5)). Specifies, by code, those common tool sets (not individual tools), andspecial tools, TMDE, and support equipment required to perform the designated function.

f. Remarks. (Column(6)). This column shall, when applicable, contain a letter code, in alphabetic order, whichshall be keyed to the remarks contained in Section IV.

B-2TM 3-4240-343-20 & P

TM 09205A-20 & P/2

B-4 EXPLANATION OCO LUMNSINTOOL ANDTEQ SECTION

a. Reference Code (Column (1)). The tool and test equipment reference code correlates with a code used in theMAC, Section H, Column (5).

b. Maintenance level (Column (2)). The lowest level of maintenance authorized to use the tool or test equipment.

c. Nomenclature (Column (3)). Name or identification of the tool or test equipment.

d. National Stock Number. (Column (4)). National Stock Number of the tool or test equipment.

e. Tool Number. (Column (5)). The manufacturer's part number.

B-5. EXPLANATION OF COLUMNS IN REMARKS, SECTION IV.

a. Reference Code (Column (2)). The code recorded in column (6), Section II.

b. Remarks (Column (2)). This column lists information pertinent to the maintenance function being performed asindicated in the MAC, Section II.

B-3

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II. MAINTENANCE ALLOCATION CHART

FOR

CHEMICAL-BIOLOGICAL MASK: COMBAT VEHICLE M42/M42A1/M42A2

(1) (2) (3) (4) (5) (6)MAINTENANCE LEVEL

Direct General Tools andGroup Component/ Maint. Unit Support Support Depot Equipment Remarks

Number Assembly Function C O F H D Ref Code Code

00 Chemical- Inspect 0.3 0.3Biological Test 0.1Mask: Combat Adjust 0.1Vehicle Replace 0.1

Repair 0.3

01 Facepiece Inspect 0.3 0.3Assembly Test 0.3 0.3 1

Repair 0.3Service 0.3 0.3

02 Canister Carrier Inspect 0.2 0.2Replace 0.1Repair 0.1

03 Hose Assembly Inspect 0.1Replace 0.1Repair 0.1

SECTION III. TOOL AND TEST EQUIPMENT REQUIREMENTS

Tool or Test Maintenance National ToolRef Code Level Nomenclature Stock Number Number

1 UNIT Protection Assessment 4240-01-365-8241 5-1-3326Testing System

SECTION IV. REMARKSNot Applicable.

B-4

TM 3-4240-343-20 & PTM 09205A-20 & P/2

APPENDIX C

UNIT MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LISTCurrent as of July 1996

SECTION I. INTRODUCTION

C-1. SCOPE.

This RPSTL lists and authorizes spares and repair parts; special tools; special test, measurement, and diagnostic equip-ment (TMDE); and other special support equipment required for performance of Unit maintenance of the M42 / M42A 1/M42A2 Masks. It authorizes the requisitioning, issue, and disposition of spares, repair parts and special tools as indi-cated by the source, maintenance and recoverability (SMR) codes.

C-2. GENERAL.

NOTEDue to Government procurement methods, the appearance of the part you receive may differfrom the illustrations in this TM.

This Repair Parts and Special Tools List is divided into the following sections:

a. Section II. Repair Parts List. A list of spares and repair parts authorized by this RPSTL for use in theperformance of maintenance. The list also includes parts which must be removed for replacement of the authorizedparts. Parts lists are composed of functional groups in ascending alphanumeric sequence with the parts in each grouplisted in ascending figure and item number sequence. Bulk materials are listed by item name in FIG. BULK at the end ofthe Section. Items listed are shown on the associated illustration.

b. Section III. Special Tools List. Not applicable.c. Section IV. Cross-Reference Indexes. A list, in National Item Identification Number (NIIN) sequence, of all

National Stock Numbers (NSN) appearing in the listings, followed by a separate list in alphanumeric sequence of all partnumbers appearing in the listings. National stock numbers and part numbers are cross-referenced to each illustrationfigure and item number appearance. The figure and item number index lists figure and item numbers in alphanumericsequence and cross-references NSN, CAGEC and part numbers.

C-3. EXPLANATION OF COLUMNS (SECTION II AND III).

a. ITEM NO. (Column (1)). Indicates the number used to identify items called out in the illustration.

b. SMR Code (Column (2)). The Source, Maintenance, and Recoverability (SMR) code is a 5-position code containingsupply/requisitioning information, maintenance level authorization criteria, and disposition instruction, as shown in thefollowing breakout:

*Complete Repair: Maintenance capacity, capability, and authority to perform all corrective maintenance tasks of the"Repair" function in a use/user environment in order to restore serviceability to a failed item.

C-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

C-3. EXPLANATION OF COLUMNS (SECTION II AND III). (CONT)

(1) Source Code. The source code tells you how to get an item needed for maintenance, repair or overhaul of anend item/equipment. Explanation of source codes follow:

Code Explanation

PA Stocked items; use the applicable NSN to request/PB requisition items with these source codes. They arePC** authorized to the level indicated by the code entered in thePD 3d position of the SMR code.PEPF **NOTE: Items coded PC are subject to deterioration.PG

KD Items with these codes are not to be requested/requisiKF tioned individually. They are part of a kit which is autho-KB rized to the maintenance level indicated in the 3d position of

the SMR code. The complete kit must be requisitioned and applied.

Items with these codes are not to be requested/requisi-tioned individually. They must be made by bulk material

MO-(Made at Unit AVUM level) which is identified by the part number in the DESCRIP-MF-(Made at DS/AVIM level) TION AND USABLE ON CODE (UOC) column and listedMH-(Made at GS level) in the Bulk Material group of the repair parts and specialML-(Made at Specialized Repair Act (SRA) tools list in this RPSTL. If the item is authorized to you byMD-(Made at Depot) the 3d position code of the SMR code, but the source

code indicates it is made at a higher level, order the item from the higher level of maintenance.

AO-(Assembled by Unit/AVUM level) Items with these codes are not to be requested/requisi-tioned individually. The parts that make up the assembled

AF-(Assembled by DS/AVIM level) item must be requisitioned or fabricated and assembled atAH-(Assembled at GS level) the level of maintenance indicated by the source code IfAL-(Assembled by SRA) the 3d position code of the SMR code authorizes you toAD-(Assembled by Depot) replace the item, but the source code indicates it is

assembled at a higher level, order the item from the higherlevel of maintenance.

XA-Do not requisition an "XA" coded item. Order its next higher assembly. (Also, refer to the NOTE below.)XB-If an "XB" coded item is not available from salvage, order it using the CAGEC and part number given.XC-Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturer's partnumber.XD-Item is not stocked. Order an "XD" coded item through normal supply channels using the CAGEC and part numbergiven, if no NSN is available.

NOTECannibalization or controlled exchange, when authorized, may be used as a source of supply foritems with the above source codes, except for those source coded "XA" or those aircraft supportitems restricted by requirements of AR 750-1.

(2) Maintenance Code. Maintenance codes tell you the level(s) of maintenance authorized to USE and REPAIRsupport items. The maintenance codes are entered in the third and fourth positions of the SMR Code as follows: C-2

C-2

TM 3-4240-343-20 & PTM 09205A-20 & P/2

C-3. EXPLANATION OF COLUMNS (SECTION II AND III).

(a) The maintenance code entered in the third position tells you the lowest maintenance level authorized toremove, replace, and use an item. The maintenance code entered in the third position will indicate authorization to oneof the following levels of maintenance:

Code Application/Explanation

C -Crew or operator maintenance done within Unit or Aviation Unit Maintenance.O -Unit or Aviation Unit level can remove, replace, and use the item.F -Direct support or Aviation Intermediate level can remove, replace, and use the item.H -General support level can remove, replace, and use the item.L -Specialized repair activity can remove, replace, and use the item (USMC - Test and Evaluation

Unit (TEU)).D -Depot level can remove, replace, and use the item.

(b) The maintenance code entered in the fourth position tells whether or not the item is to be repaired andidentifies the lowest maintenance level with the capability to do complete repair (i.e., perform all authorized repairfunctions). (NOTE: Some limited repair may be done on the item at a lower level of maintenance, if authorized by theMaintenance Allocation Chart (MAC) and SMR codes). This position will contain one of the following maintenancecodes.


O -Unit or Aviation Unit is the lowest level that can do complete repair of the item.F -Direct support or Aviation Intermediate is the lowest level that can do complete repair of the item.H -General support is the lowest level that can do complete repair of the item.L -Specialized repair activity (designate the specialized repair activity) is the lowest level that can

do complete repair of the item (USMC - Test and Evaluation Unit (TEU)).D -Depot is the lowest level that can do complete repair of the item.Z -Nonreparable. No repair is authorized.B -No repair is authorized. (No parts or special tools are authorized for the maintenance of a "B"

coded item). However, the item may be reconditioned by adjusting, lubricating, etc., at the user level.(3) Recoverability Code. Recoverability codes are assigned to items to indicate the disposition action on

unserviceable items. The recoverability code is entered in the fifth position of the SMR Code as follows:


Z -Nonreparable item. When unserviceable, condemn and dispose of the item at the level of maintenance shown in 3d position of SMR code.

O -Reparable item. When uneconomically reparable, condemn and dispose of the item at the Unit orAviation Unit level.

F -Reparable item. When uneconomically reparable, condemn and dispose of the item at the Direct support or Aviation Intermediate level.

H -Reparable item. When uneconomically reparable, condemn and dispose of the item at the General support level.

D -Reparable item. When beyond lower level repair capability, return to depot. Condemnation and disposal of item not authorized below Depot level.

L -Reparable item. Condemnation and disposal not authorized below Specialized Repair Activity (SRA) (USMC -Test and Evaluation Unit (TEU)).

A -Item requires special handling or condemnation procedures because of specific reasons (e.g., precious metal content, high dollar value, critical material, or hazardous material). Refer to appropriate manuals/directives for specific instructions.

c. CAGEC (Column (3)). The Commercial and Government Entity Code (CAGEC) is a 5-digit code which is usedto identify the manufacturer, distributor, or Government agency, etc., that supplies the item.

C-3TM 3-4240-343-20 & P

TM 09205A-20 & P/2

C-3. EXPLANATION OF COLUMNS (SECTION II AND III). (CONT)

d. PART NUMBFR (Column (4)). Indicates the primary number used by the manufacturer (individual, company,firm, corporation, or Government activity), which controls the design and characteristics of the item by means of itsengineering drawings, specifications standards, and inspection requirements to identify an item or range of items.

NOTEWhen you use an NSN to requisition an item, the item you receive may have a different partnumber from the part ordered.

e. DESCRIPTION AND USABLE ON CODE (UOC) (Column (5)). This column includes the following information:(1) The Federal item name and, when required, a minimum description to identify the item.(2) The usable on code, when applicable. (See para. C-5, Special Information.)(3) The statement "END OF FIGURE" appears just below the last item description in Column 5 for a given figure in

both Section II and Section III.f. QTY (Column (6)). The QTY (quantity per figure column) indicates the quantity of the item used in the breakout

shown on the illustration figure, which is prepared for a functional group, subfunction group, or an assembly. A "V"appearing in this column in lieu of a quantity indicates that the quantity is variable and the quantity may vary fromapplication to application.

C-4. EXPLANATION OF COLUMNS (Section IV).

a. NATIONAL STOCK NUMBER (NSN) INDEX.(1) STOCK NUMBF.R column. This column lists the NSN by National Item Identification Number (NIIN)

sequence. The NIIN consists of the last nine digits of the NSN. (i.e., NSN )5305-01-674-1467

NINWhen using this column to locate an item, ignore the first 4 digits of the NSN. However, the complete NSN should beused when ordering items by stock number.

(2) FIG. column. This column lists the number of the figure where the item is identified/located. The figuresare in numerical order in Section II and III.

(3) ITEM column. The item number identifies the item associated with the figure listed in the adjacent FIG.column. This item is also identified by the NSN listed on the same line.

b. PART NUMBER INDEX. Part numbers in this index are listed by part number in ascending alphanumericsequence (i.e.,vertical arrangement of letter and number combination which places the first letter or digit of each group inorder A through Z, followed by the numbers 0 through 9 and each following letter or digit in like order).

(1) CAGFC column. The Commercial and Government Entity Code (CAGEC) is a 5-digit code used to identifythe manufacturer, distributor, or Government agency, etc., that supplies the item.

(2) PART NUMBER column. Indicates the primary number used by the manufacturer (individual, firm,corporation, or Government activity), which controls the design and characteristics of the item by means of itsengineering drawings, specifications standards, and inspection requirements to identify an item or range of items.

(3) STOCK NUMBER column. This column lists the NSN for the associated part number and manufactureridentified in the PART NUMBER and CAGEC columns to the left.

(4) FIG. column. This column lists the number of the figure where the item is identified/located in Section IIand III.

(5) ITFM column. The item number is that number assigned to the item as it appears in the figure referencedin the adjacent figure number column.

c. FIGURE AND ITEM NUMBER INDEX.(1) FIG. column. This column lists the number of the figure where the item is identified/located in Section II

and III.

C-4TM 3-4240-343-20 & P

TM 09205A-20 & P/2

C-3. EXPLANATION OF COLUMNS (SECTION IV).

(2) ITEM column. The item number is that number assigned to the item as it appears in the figure referencedin the adjacent figure number column.

(3) STOCK NUMBER column. This column lists the NSN for the item.(4) CAGEC column. The Commercial and Government Entity Code (CAGEC) is a 5-digit code used to

identify the manufacturer, distributor, or Government agency, etc., that supplies the item.(5) PART NUMBFR column. Indicates the primary number used by the manufacturer (individual, firm,

corporation, or Government activity), which controls the design and characteristics of the item by means of itsengineering drawings, specification standards, and inspection requirements to identify an item or range of items.

C-5. SPECIAL INFORMATION.

a. USABLE ON CODE. The usable on code appears in the lower left corner of the Description Column heading.Usable on codes are shown as "UOC: ..." in the Description Column (justified left) on the first line of the applicable itemdescription/nomenclature. Uncoded items are applicable to all models. Identification of the usable on codes used in theRPSTL are:

Code Used On

R90 M42 Combat Vehicle Mask (Sm.)90A M42 Combat Vehicle Mask (Med.)90B M42 Combat Vehicle Mask (Lg.)Z55 M42A 1I Combat Vehicle Mask (Sm.)5Z5 M42A I Combat Vehicle Mask (Med.)55Z M42A 1 Combat Vehicle Mask (Lg.)213 M42A2 Combat Vehicle Mask (Sm.)21M M42A2 Combat Vehicle Mask (Med.)21L M42A2 Combat Vehicle Mask (Lg.)

C-6. HOW TO LOCATE REPAIR PARTS.

a. When National Stock Number or Part Number is Not Known.

(1) First. Using the table of contents, determine the functional group or subfunctional group to which the itembelongs. This is necessary since figures are prepared for functional groups and subfunctional groups, and listings aredivided into the same groups.

(2) Second. Find the figure covering the functional group or subfunctional group to which the item belongs.(3) Third. Identify the item on the figure and use the Figure and Item Number Index to find the NSN.

b. When National Stock Number or Part Number is Known.

(1) First. Using the National Stock Number or Part Number Index, find the pertinent National Stock Number orPart Number. The NSN index is in National Item Identification Number (NIIN) sequence. (see C-4.a(1)). The partnumbers in the Part Number Index are listed in ascending alphanumeric sequence (see C-4.b). Both indexes cross-reference you to the illustration/figure and item number of the item you are looking for.

(2) Second. Turn to the figure and item number, verify that the item is the one you're looking for, then locatethe item number in the repair parts list for the figure.

C-7. ABBREVIATIONS. Not applicable.

C-5

TM 3-4240-343-20 & PTM 09205A-20 & P/2

Figure C-1. Chemical-Biological Mask: Combat Vehicle M42

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

(1) (2) (3) (4) (5) (6)

ITEM SMR PARTNO CODE CAGEC NUMBER DESCRIPTION AND USABLE ON CODES(UOC) QTY

GROUP 00: CHEMICAL BIOLOGICAL MASK:COMBAT VEHICLE M42

FIGURE C-1. CHEMICAL BIOLOGICAL MASK

1 XAODD 81361 5-1-1534-10 FACEPIECE ASSEMBLY........................................................ 1UOC:R90

1 XAODD 81361 5-1-1534-20 FACEPIECE ASSEMBLY........................................................ 1UOC:90A

1 XAODD 81361 5-1-1534-30 FACEPIECE ASSEMBLY........................................................ 1UOC:90B

2 PAOZZ 80063 SM-C-963194 CORD ASSEMBLY, ELECT.................................................... 13 PAOZZ 81361 5-1-1545-20 OUTSERTS, NEUTRAL.......................................................... 14 PAOZZ 81361 5-1-1545-10 OUTSERTS, CLEAR .............................................................. 15 PAOZZ 81361 5-1-1005 CARRIER, MASK, ................................................................. 16 PCOZA 81361 5-3-1520 CANISTER, CHEMICAL-B...................................................... 17 PCOOO 81361 5-1-1536 CARRIER, CANISTER............................................................ 18 PAOZZ 81349 MILB51170 BAG, WATERPROOFING, C ................................................. 19 PCOZZ 81361 5-1-1002 HOOD, CHEMICAL-BIOL ....................................................... 1

10 PAOZZ 81361 5-1-1003 FACEFORM, PACKAGING..................................................... 1

END OF FIGURE

C-1-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

Figure C-2. Facepiece Assembly M42

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

(1) (2) (3) (4) (5) (6)


GROUP 01: FACEPIECE ASSEMBLYCOMBAT VEHICLE M42

FIGURE C-2. FACEPIECE ASSEMBLY

1 PCOZZ 81361 5-1-1081 DISK, VALVE ......................................................................... 22 PCOZZ 81361 5-1-1085 DRINK TUBE, INTERNAL ...................................................... 13 PAOZZ 81361 D5-2-1661 HARNESS, HEAD .................................................................. 14 PAOZZ 81361 5-1-1524 COVER, CLAMP .................................................................... 15 PAOZZ 81361 5-1-1522 GASKET ................................................................................ 16 PAOZZ 81361 5-1-1050-10 DEFLECTOR, POST, SUB ..................................................... 1

UOC: R906 PAOZZ 81361 5-1-1050-20 DEFLECTOR, POST, SUB ..................................................... 1

UOC: 90A, 90B7 PAOZZ 81361 5-1-1055 DISK, VALVE ......................................................................... 18 PAOZZ 81361 5-1-1086 QUICK DISCONNECT............................................................ 19 PAOZZ 81361 5-1-1057 DISK,VALVE ......................................................................... 1

10 PAOZZ 81361 5-1-1009 COVER, OUTLET VALVE....................................................... 111 PAOZZ 81361 5-1-1543 MICROPHONE, DYNAMIC..................................................... 112 PAOZZ 03038 LP57N26S5 SCREW, SELF-LOCKING ..................................................... 213 PAOZZ 03038 5-1-1059 RING, RETAINING.INST ........................................................ 114 PCOZZ 81361 5-1-1047 DIAPHRAGM,MICRO PHO NE .............................................. 115 PCOZZ 81361 5-1-1060 GASKET ................................................................................ 1

END OF FIGURE

C-2-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

Figure C-3. Canister Carrier M42

(1) (2) (3) (4) (5) (6)


GROUP 02: CANNISTER CARRIER

FIGURE C-3 CANNISTER CARRIER

1 PCOZZ 81361 5-1-1539 COVER, ACCESS .................................................................. 1

END OF FIGURE

C-3-1 (C-3-2 blank)

TM 3-4240-343-20 & PTM 09205A-20 & P/2

Figure C-4. Chemical Biological Mask: Combat Vehicle M42A1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

(1) (2) (3) (4) (5) (6)


GROUP 00: CHEMICAL BIOLOGICAL MASK:COMBAT VEHICLE M42AI

FIGURE C-4. CHEMICAL BIOLOGICAL MASK

1 XAODD 81361 5-1-2743-10 FACEPIECE ASSEMBLY........................................................ 1UOC:Z55

1 XAODD 81361 5-1-2743-20 FACEPIECE ASSEMBLY ....................................................... 1UOC:5Z5

1 XAODD 81361 5-1-2743-30 FACEPIECE ASSEMBLY........................................................ 1UOC:55Z

2 PAOZZ 81361 5-1-1545-20 OUSERTS, NEUTRAL ........................................................... 13 XAODD 81361 5-1-1545-10 OUTSERTS, CLEAR ............................................................. 14 XAODD 81361 5-1-2774 CARRIER ASSY..................................................................... 15 XAODD 81361 5-3-1520 CANISTER, CHEMICAL-B...................................................... 16 PAOZZ 81349 MILB51170 BAG, WATERPROOF, C........................................................ 17 PAOZZ 81361 5-1-1001 FACEFORM, PACKAGING..................................................... 18 PAOOO 81361 5-1-1963 HOSE ASSEMBLY ................................................................. 19 PAOOO 81361 5-1-1971 CANISTER CARRIER ASSEMBLY ........................................ 1

10 PCOZZ 81361 5-1-2701 HOOD ASSEMBLY................................................................. 111 PCOZZ 81361 5-1-2707-1 FACEPIECE SECOND ........................................................... 1

UOC: Z5511 PCOZZ 81361 5-1-2707-2 FACEPIECE SECOND ........................................................... 1

UOC: 55Z, 5Z512 PCOZZ 81361 5-1-3321-10 FACEPIECE, USS.................................................................. 1

UOC:Z5512 PCOZZ 81361 5-1-3321-20 FACEPTECE, USS ................................................................ 1

UOC:5Z5, 55Z13 PAOZZ 80063 SM-C-963194 CORD ASSEMBLY, ELECT ................................................... 1

END OF FIGURE

C-4-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

Figure C-5. Facepiece Assembly M42A1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

(1) (2) (3) (4) (5) (6)


GROUP 01: FACEPIECE ASSEMBLYFIGURE C-5. FACEPIECE ASSEMBLY

1 PCOZZ 81361 5-1-1081 DISK,VALVE ......................................................................... 22 PCOZZ 81361 5-1-1085 DRINK TUBE, INTERNAL ...................................................... 13 PAOZZ 81361 D2-2-1661 HARNESS, HEAD ................................................................. 14 PAOZZ 81361 5-1-1050-10 DEFLECTOR, POST, SUB- .................................................... 1

UOC: Z55...............................................................................4 PAOZZ 81361 5-1-1050-20 DEFLECTOR, POST, SUB- .................................................... 1

UOC:5ZS,55Z ........................................................................5 PCOZZ 81361 5-1-1055 DISK,VALVE ......................................................................... 16 PAOZZ 81361 5-1-1054 BODY,VALVE ........................................................................ 17 PAOZZ 81361 5-1-1086 QUICK DISCONNECT. ......................................................... 18 PAOZZ 81361 5-1-1057 DISK,VALVE ......................................................................... 19 PAOZZ 81361 5-1-1009 COVER, OUTLET VALVE ...................................................... 1

10 PAOZZ 81361 5-1-1059 RING, RETAINING, INST ....................................................... 111 PCOZZ 81361 5-1-1047 DIAPHRAGM, MICROPHONE ............................................... 112 PCOZZ 81361 5-1-1060 GASKET ................................................................................ 113 PCOZZ 81361 5-1-1543 MICROPHONE, DYNAMIC .................................................... 114 PAOZZ 03038 LP57N26S5 SCREW, SELF-LOCKING ..................................................... 2

END OF FIGURE

C-5-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

Figure C-6. Canister Carrier Assembly

(1) (2) (3) (4) (5) (6)


GROUP 02: CANNISTER CARRIERFIGURE C-6: CANNISTER CARRIER ASSEMBLY

1 PAOZZ 81361 5-1-1960-10 DISCONNECT, ASSY ARM.................................................... 1

END OF FIGURE

C-6-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

Figure C-7. Hose Assembly

(1) (2) (3) (4) (5) (6)


GROUP 03: HOSE ASSEMBLY

FIGURE C-7. HOSE ASSEMBLY

1 PCOZZ 81361 5-1-1522 GASKET, CONNECTOR ........................................................ 12 PAOZZ 81361 5-1-1524 COVER, CLAMP .................................................................... 2

END OF FIGURE

C-7-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II


TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

(1) (2) (3) (4) (5) (6)


GROUP 00: CHEMICAL BIOLOGICAL MASK:COMBAT VEHICLE M42A2

FIGURE C-8. CHEMICAL BIOLOGICAL MASK1 XAODD 81361 5-1-1001-10 FACEPIECE ASSEMBLY ....................................................... 1

UOC:2131 XAODD 81361 5-1-1001-20 FACEPIECE ASSEMBLY ....................................................... 1

UOC:21M1 XAODD 81361 5-1-1001-30 FACEPIECE ASSEMBLY........................................................ 1

UOC:21L2 PAOZZ 81361 5-1-3339 MICROPHONE, DETACHABLE ............................................. 13 PAOZZ 81361 5-1-1545-20 OUTSERTS, NEUTRAL ......................................................... 14 PAOZZ 81361 5-1-1545-10 OUTSERTS, CLEAR ............................................................. 15 PAOZZ 81361 5-1-2774 CARRIER ASSY. .................................................................. 16 PCOZA 81361 5-3-1520 CANISTER, CHEMICAL-B ..................................................... 17 PAOZZ 81349 MILB51170 BAG, WATERPROOF, C........................................................ 18 PAOZZ 81361 5-1-1003 FACEFORM, PACKAGING..................................................... 19 PAOOO 81361 5-1-1963 HOSE ASSEMBLY ................................................................. 1

10 PAOOO 81361 5-1-1971 CANISTER CARRIER ASSEMBLY ......................................... 111 PCOZZ 81361 5-1-2701 HOOD ASSEMBLY................................................................. 112 PCOZZ 81361 5-1-2707-1 FACEPIECE SECOND ........................................................... 1

UOC: 21312 PCOZZ 81361 5-1-2707-2 FACEPIECE SECOND ........................................................... 1

UOC:21M,21L13 PCOZZ 81361 5-1-3321-10 FACEPIECE, US .................................................................... 1

UOC: 21313 PCOZZ 81361 5-1-3321-20 FACEPIECE, USS ................................................................. 1

UOC: 21M, 21L

END OF FIGURE

C-8-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II


TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

(1) (2) (3) (4) (5) (6)


GROUP 01: FACEPIECE ASSEMBLY

FIGURE C-9. FACEPIECE ASSEMBLY

1 PCOZZ 81361 5-1-1081 DISK,VALVE ......................................................................... 22 PCOZZ 81361 5-1-1085 DRINK TUBE, INTERNAL ...................................................... 13 PAOZZ 81361 D2-2-1661 HARNESS, HEAD .................................................................. 14 PAOZZ 81361 5-1-1050-10 DEFLECTOR, POST, SUB- .................................................... 1

UOC: 2134 PAOZZ 81361 5-1-1050-20 DEFLECTOR, POST, SUB-. ................................................. 1

UOC:21M,21L5 PCOZZ 81361 5-1-1055 DISK,VALVE ......................................................................... 16 PAOZZ 81361 5-1-1054 BODY,VALVE......................................................................... 17 PAOZZ 81361 5-1-1086 QUICK DISCONNECT............................................................ 18 PCOZZ 81361 5-1-1057 DISK,VALVE ......................................................................... 19 PAOZZ 81361 5-1-1009 COVER, OUTLET VALVE....................................................... 1

10 PAOZZ 81361 5-1-1059 RING, RETAINING, INST ....................................................... 111 PCOZZ 81361 5-1-1047 DIAPHRAGM, MICROPHONE................................................ 112 PCOZZ 81361 5-1-1060 GASKET ................................................................................ 1

END OF FIGURE

C-9-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

Figure C-10. Canister Carrier Assembly

(1) (2) (3) (4) (5) (6)


GROUP 02: CANNISTER CARRIERFIGURE C-10. CANISTER CARRIER ASSEMBLY

1 PAOZZ 81361 5-1-1960-10 DISCONNECT, ASSY ARM.................................................... 1END OF FIGURE

C-10-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II

Figure C-11. Hose Assembly

(1) (2) (3) (4) (5) (6)


GROUP 03: HOSE ASSEMBLYFIGURE C-11. HOSE ASSEMBLY

1 PCOZZ 81361 5-1-1522 GASKET, CONNECTOR ........................................................ 12 PAOZZ 81361 5-1-1524 COVER, CLAMP .................................................................... 2

END OF FIGURE

C-11-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION III. SPECIAL TOOLS LISTNot Applicable

C-12-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION IV

CROSS-REFERENCE INDEXESNATIONAL STOCK NUMBER INDEX

STOCK NUMBER FIG ITEM STOCK NUMBER FIG ITEM

4240-00-377-9401 C-1 8 4240-01-2608711 C-2 2C-4 6 C-5 2C-8 7 C-9 2

5305-01-0404682 C-2 12 4240-01-260-8723 C-1 9C-5 14 4240-01-267-8161 C-2 6

4240-01-223-7313 C-2 3 C-5 4C-5 3 C-9 4C-9 3 4240-01-268-0392 C-2 6

4820-01-226-7005 C-5 6 C-5 4C-9 6 C-9 4

5330-01-231-3877 C-2 5 5995-01-276-0939 C-1 2C-11 1 C-4 13

4240-01-2608696 C-2 4 5965-01-277-8589 C-2 11C-7 2 C-5 13

C- 1 2 4240-01-361-1319 C-1 6424(M01-260-8697 C-1 10 C-4 5

C-4 7 C-8 6C-8 8 4240-01-3760471 C-4 11

4240(M1-2608698 C-1 5 C-8 124240-01-260-8699 C-2 10 4240-01-376-1382 C-4 9

C-5 9 C-8 10C-9 9 4240-01-376-3152 C4 10

5365-01-260-8700 C-2 13 C-8 11C-5 10 4240-01-378-6479 C-4 8C-9 10 C-8 9

5965-01-2608701 C-2 14 4240-01-381-1568 C-4 11C-5 11 C-8 12C-9 11 4730-01-391-8461 C-2 8

5330-01-260-8702 C-2 15 C-5 7C-5 12 C-9 7C-9 12 4730-01-392-2173 C6 1

4820-01-2608703 C-2 1 C-10 1C-5 1 4240-01-399-3350 C-4 4C-9 1 C-8 5

4240-01-260-8704 C-1 7 4240-01413-1540 C4 125340-01-2608705 C-3 I C-8 13424001-2608706 C-1 3 4240-01413-1543 C-4 12

C-4 2 C-8 13C-8 3 5965-01414-2257 C-8 2

4240-01-2608707 C-1 4C-4 3C-8 4

4820-01-260-8709 C-2 9C-5 8C-9 8

4820-01-2608710 C-2 7C-5 5C-9 5

I-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION IV

CROSS-REFERENCE INDEXESPART NUMBER INDEX

CAGEC PART NUMBER STOCK NUMBER FIG. ITEM

81361 D5-2-1661 4240-01-223-7313 C-2 3C-5 3C-9 3

03038 LP57N26S5 5305-01-040682 C-2 12C-5 14

81349 MILB51170 4240-0377-9401 C-1 8C-4 6C-8 7

80063 SM-C-963194 5995-01-27640939 C-1 2C-4 13

81361 5-1-1001-10 C-8 181361 5-1-1001-20 C-8 181361 5-1-1001-30 C-8 181361 5-1-1002 4240-01-260-8723 C-1 981361 5-1-1003 4240-01-260-8697 C-1 10

C-4 7C-8 8

81361 5-1-1005 424(001-260-8698 C-1 581361 5-1-1009 4240-01-260-8699 C-2 10

C-5 9C-9 9

81361 5-1-1047 5965-01-260-8-01 C-2 14C-5 11C-9 11

81361 5-1-1050-10 424001-267-8161 C-2 6C-5 4C-9 4

81361 5-1-1050-20 4240-01-26840392 C-2 6C-5 4C-9 4

81361 5-1-1054 4820-01-226-7005 C-5 6C-9 6

81361 5-1-1055 4820-01-260-8710 C-2 7C-5 5C-9 5

81361 5-1-1057 4820-01-2608709 C-2 9C-5 8C-9 8

81361 5-1-1059 5365-01-260-8700 C-2 13C-5 10C-9 10

81361 5-1-1060 5330-01-260-8702 C-2 15C-5 12C-9 12

81361 5-1-1081 4820-01-260-8703 C-2 1C-5 1C-9 1

81361 5-1-1085 424001-260-8711 C-2 2C-5 2C-9 2

I-2

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION IV

CROSS-REFERENCE INDEXESPART NUMBER INDEX

CAGEC PART NUMBER STOCK NUMBER FIG. ITEM

81361 5-1-1086 473001-391-8461 C-2 8C-5 7C-9 7

81361 5-1-1522 5330-01-231-3877 C-2 5C-7 1C11 1

81361 5-1-1524 4240-01-260-8696 C-2 4C-7 2C-11 2

81361 5-1-1534-10 C-1 181361 5--1-1534-20 C-1 181361 5-1-1534-30 C-1 181361 5-1-1536 4240-01-260-8704 C-1 781361 5-1-1539 5340-01-260-8705 C-3 181361 5-1-1543 5965-01-277-8589 C-2 II

C-5 1381361 5-1-1545-10 4240-01-260-8707 C-1 4

C-4 3C-8 4

81361 5-1-1545-20 424001-2608706 C-1 3C-4 2C-8 3

81361 5-1-1960-10 4730-01-392-2173 C-6 1C-10 1

81361 5-1-1963 4720-01-3786479 C-4 8C-8 9

81361 5-1-1971 4240-01-376-1382 C-4 9C-8 10

81361 5-1-2701 424(0-01-376-3152 C-4 10C-8 11

81361 5-1-2707-1 4240-01-3760471 C-4 11C-8 12

81361 5-1-2707-2 4240-01-381-1568 C4 11C-8 12

81361 5-1-2743-10 C-4 181361 5-1-2743-20 C-4 181361 5-1-2743-30 C-4 181361 5-1-2774 4240-01-399-3350 C-4 4

C-8 581361 5-1-3321-10 4240-01-413-1540 C-4 12

C-8 1381361 5-1-3321-20 424(0-01413-1543 C-4 12

C-8 1381361 5-1-3339 5965-01414-2257 C-8 281361 5-3-1520 4240-01-361-1319 C-1 6

C-4 5C-8 6

I-3

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION IV

CROSS-REFERENCE INDEXESFIGURE AND ITEM NUMBER INDEX

FIG. ITEM STOCK NUMBER CAGEC PART NUMBER

C-1 1 81361 5-1-1534-10C-1 1 81361 5-1-1534-20C-1 1 81361 5-1-1534-30C-1 2 5995-01-276-0939 80063 SM-C-963194C-1 3 4240-01-260-8706 81361 5-1-1545-20C-1 4 4240-01-260-8707 81361 5-1-1545-10C-1 5 424(001-260-8696 81361 5-1-1005C-1 6 4240()1-361-1319 81361 5-3-1520C-1 7 4240-01-260-8704 81361 5-1-1536C-1 8 424000-377-9401 81349 MRLJB51170C-1 9 4240-01-260-8723 81361 5-1-1002C-1 10 4240-01-260-8697 81361 5-1-1003C-2 1 4820-01-260-8703 81361 5-1-1081C-2 2 4240-01-260-8711 81361 5-1-1085C-2 3 4240-01-223-7313 81361 D5-2-1661C-2 4 424(001-260-8696 81361 5-1-1524C-2 5 5330-01-231-3877 81361 5-1-1522C-2 6 4240-01-267-8161 81361 5-1-1050-10C-2 6 4240-01-268-0392 81361 5-1-1050-20C-2 7 4820-01-260-8710 81361 5-1-1055C-2 8 81361 5-1-1086C-2 9 4820-01-260-8709 81361 5-1-1057C-2 10 4240-01-260-8699 81361 5-1-1009C-2 11 5965-01-277-8589 81361 5-1-1543C-2 12 5305-01-040-4682 03038 LP57N26S5C-2 13 5365-01-260-8700 81361 5-1-1059C-2 14 5965-01-260-8701 81361 5-1-1047C-2 15 5330-01-260-8702 81361 5-1-1060C-3 1 5340-01-260-8705 81361 5-1-1539C4 1 81361 5-1-2743-10C4 1 81361 5-1-2743-20C-4 1 81361 5-1-2743-30C-4 2 4240-01-260-8706 81361 5-1-1545-20C-4 3 4240-01-260-8707 81361 5-1-1545-10C4 4 4240-01-399-3350 81361 5-1-2774C-4 5 4240-01-361-1319 81361 5-3-1520C-4 6 42400-M377-9401 81349 M11B51170C-4 7 4240)01-260-8697 81361 5-1-1003C-4 8 4720-01-378-6479 81361 5-1-1963C4 9 4240-01-376-1382 81361 5-1-1971C-4 10 4240-01-376-3152 81361 5-1-2701C-4 11 4240401-376-0471 81361 5-1-2707-1C-4 11 4240-01-381-1568 81361 5-1-2707-2C-4 12 4240-01413-1540 81361 5-1-3321-10C-4 12 4240-01413-1543 81361 5-1-3321-20C4 13 5995-01-2760939 80063 SM-C-93194C-5 1 4820-01-260-8703 81361 5-1-1081C-5 2 4240-01-260-8711 81361 5-1-1085C-5 3 4240-01-223-7313 81361 D5-2-1661

I-4

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION IV

CROSS-REFERENCE INDEXESFIGURE AND ITEM NUMBER INDEX

FIG. ITEM STOCK NUMBER CAGEC PART NUMBER

C-5 4 4240-01-267-8161 81361 5-1-1050-10C-5 4 4240-01-268-0392 81361 5-1-1050-20C-5 5 4820-01-260-8710 81361 5-1-1055C-5 6 4820-01-226-7005 81361 5-1-1054C-5 7 4730-01-391-8461 81361 5-1-1086C-5 8 4820-01-260-8709 81361 5-1-1057C-5 9 4240-01-260-8699 81361 5-1-1009C-S 10 5365-01-2608700 81361 5-1-1059C-5 11 5965-01-260-8701 81361 5-1-1047C-5 12 5330-01-260-8702 81361 5-1-1060C-5 13 5965-01-277-8589 81361 5-1-1543C-5 14 5305-01-0404682 03038 LP57N26S5C-6 1 4730-01-392-2173 81361 5-1-1960-10C-7 1 5330-01-231-3877 81361 5-1-1522C-7 2 4240-01-260-8696 81361 5-1-1524C-8 1 81361 5-1-1001-10C-8 1 81361 5-1-1001-20C-8 1 81361 5-1-1001-30C-8 2 5965-01414-2257 81361 5-1-3339C-8 3 4240-01-260-8706 81361 5-1-1545-20C-8 4 4240-01-260-8707 81361 5-1-1545-10C-8 5 4240-01-399-3350 81361 5-1-2774C-8 6 4240-01-361-1319 81361 5-3-1520C-8 7 4240-00377-9401 81349 MILB51170C-8 8 4240-01-260-8697 81361 5-1-1003C-8 9 4720-01-378-6479 81361 5-1-1963C-8 10 4240-01-376-1382 81361 5-1-1971C-8 11 4240-01-376-3152 81361 5-1-2701C-8 12 4240-01-3760471 81361 5-1-2707-1C-8 12 4240-01-381-1568 81361 5-1-2707-2C-8 13 4240-01413-1540 81361 5-1-3321-10C-8 13 4240-01413-1543 81361 5-1-3321-20C-9 1 4820-01-260-8703 81361 5-1-1081C-9 2 4240-01-260-8711 81361 5-1-1085C-9 3 4240-01-223-7313 81361 D5-2-1661C-9 4 4240-01-267-8161 81361 5-1-1050-10C-9 4 4240-01-268-0392 81361 5-1-1050-20C-9 5 4820-01-260-8710 81361 5-1-1055C-9 6 4820-01-226-7005 81361 5-1-1054C-9 7 4730-01-391-8461 81361 5-1-1086C-9 8 4820-01-260-8709 81361 5-1-1057C-9 9 4240-01-260-8699 81361 5-1-1009C-9 10 5365-01-260-8700 81361 5-1-1059C-9 11 5965-01-260-8701 81361 5-1-1047C-9 12 5330-01-260-8702 81361 5-1-1060C-10 1 4730-01-392-2173 81361 5-1-196010C-11 1 5330-01-231-3877 81361 5-1-1522C-11 2 4240-01-2608696 81361 5-1-1524

I-5 (I-6 blank)

TM 3-4240-343-20 & PTM 09205A-20 & P/2

APPENDIX D

EXPENDABLE AND DURABLE ITEMS LIST

SECTION I. INTRODUCTIOND-1. SCOPE

This appendix lists expendable and durable items that you will need to operate and maintain the M42 / M42A1 / M42A2Masks. This listing is for informational purposes only and is not authority to requisition the listed items. These items areauthorized to you by CTA 50-970, Expendable/Durable Items (except medical, Class V, repair parts, and heraldic items),or CTA 8-100, Army Medical Department Expendable/Durable Items.

D-2. EXPLANATION OF COLUMNS.a. Column 1-Item Number. This number is assigned to the entry in the listing and is referenced in the narrative

instructions to identify the item.,("Use tubing, item 5, app E").b. Column 2-Level. This column identifies the lowest level of maintenance that requires the listed item (C-

Operator/ Crew, O-Unit Maintenance, F-Direct Support Maintenance).c. Column 3-National Stock Number. This is the National stock number assigned to the item which you can use to

requisition it.d. Column 4-Description. Indicates the item name, description, (CAGEC) and part number. This provides the other

information you need to identify the item.e. Column 5-Unit of Measure (U/M). This code shows the physical measurement or count of an item, such as

gallon (GL), each (EA), dozen (DZ), gross (GZ), etc. If the unit of measure differs from the unit of issue, requisition thelowest unit of issue that will satisfy your requirements.

D-1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II. EXPENDABLE AND DURABLE ITEMS LIST

(1) (2) (3) (4) (5)Item National

Number Level Stock Number Description U/M

1 O 6515-01-2346838 APPLICATOR, DISPOSABLE: plastic EAor wood, cotton tipped (5L934) 362

2 O 7920-{(X205-0565 BRUSHDUSTING,LENS EA(81348)H-B-1654

3 O 7920(-061(1037 BRUSH, SCRUB: nylon bristle EA(81348) H-B-1490-6P1

4 O 6665-00-978-5516 BULBASPIRATOR EA(40912)B-H-5607

5 O 6810-00-2424770 CALCIUMHYPOCHORIE, TECHNICAL: LBgranular: 45 lb. bx. (12ea 3-3/4 lb. bt.)(81348)OC114

O 6810-25504)471 6 oz. BT OZO 6810.-238-8115 5 lb. BT LB

6 O 685(0-592-3283 CLEANING COMPOUND, OPIICAL LENS DZ(04019) LENSWICK

7 O 8305-00222-2423 CLOTH CHEESE CLOTH YD(81348) CCC-C440

8 O 8415-00926-669 GLOVES,CHEMICAL AND OIL PR(81348) ZZ-G-381

9 O 6505-00-655-8366 ISOPROPYL RUBBINGALCOHOL: PTbottle, plastic container (56287) PUREPAC

10 O 8010-00-085-0559 LACQUER: No. 4 black, bushing 4.0 oz OZ(133.4g) bt (19139)4

11 O 6810-00-123-7047 N-AMYLACETATE, REAGENT: PTclear flammable liquid (81349) MIL-C-5 1130

D-2

TM 3-4240-343-20 & PTM 09205A-20 & P/2

SECTION II. EXPENDABLE AND DURABLE ITEMS LIST

(1) (2) (3) (4) (5)Item National

Number Level Stock Number Description U/M

12 O 7240-01-0944305 PAIL, UTILITY: plastic, snap - on lid, EA5.00 gal. (58536) A-A-332

13 O 5120-0a228-0730 SCREWDRIVER,JEWELER EA(81348) GGG-S-1808 type 1

14 O 51 10-(0293-3444 SHEARS, STRAIGHT TRIMMERS: 6 in. PR(81348) GGG-S (78

15 O 8520-Ot228-0598 SOAP, TOILET: non-medicated, CLliquid, type 1 (81348) P-S-624

16 O 6665-00(928-5731 TUBE, SMOKE EA(40912) BH5645

17 O 8115-X-726-0673 BOX,SHIPPING EA(81348) PPP-B-40

18 O 8115430-222-3715 CRATE, SHIPPING EA(81336) DI 152-1

19 O 8135-00-116-1443 CUSHIONINGMATERIAL RO(81349) MILP-26514

20 O 7510-00-2665016 TAPE, PRESSURE SENSTIVE: 2" wide RO(81348) PPP-T-60

D-3 (D-4 blank)

TM 3-4240-343-20 & PTM 09205A-20 & P/2

INDEX

SUBJECT PAGEA

Adjusting Mask Assembly at Initial Fitting ................................ ................................ ................................ ....... 2-13Adjusting Mask Assembly ................................ ................................ ................................ ......................... 2-15Checking Mask Assembly for Fit ................................ ................................ ................................ ............... 2-16Putting on Mask Assembly................................ ................................ ................................ ........................ 2-14

Airflow Deflector, Inlet Valve Disk, and Valve Body ................................ ................................ ........................ 2-51Installation ................................ ................................ ................................ ................................ ............... 2-53Removal ................................ ................................ ................................ ................................ .................. 2-51

Armor Quick Disconnect (AQD) ................................ ................................ ................................ ...................... 2-61Installation ................................ ................................ ................................ ................................ ................ 2-61Removal ................................ ................................ ................................ ................................ ................... 2-61

CCanister Cover ................................ ................................ ................................ ................................ ............... 2-60

Installation ................................ ................................ ................................ ................................ ............... 2-60Removal ................................ ................................ ................................ ................................ .................. 2-60

Checking Drinking System for Proper Function ................................ ................................ .............................. 2-21Checking the Mask Assembly for Proper Function................................ ................................ ........................... 2-17

Testing Mask Assembly with a-Amyl Acetate ................................ ................................ ........................... 2-18Testing Mask Assembly with M41 PATS................................ ................................ ................................ ...2-17

Checking for Leaks ................................ ................................ ................................ ................................ ....... .2-17Clamp Cover ................................ ................................ ................................ ................................ .................. 2-62


Cleaning and Sanitizing................................ ................................ ................................ ................................ ...2-69Cleaning Carrier ................................ ................................ ................................ ................................ ....... 2-72Cleaning Mask Assembly................................ ................................ ................................ .......................... 2-69Sanitizing Mask Assembly ................................ ................................ ................................ ....................... 2-73

Common Tools and Equipment ................................ ................................ ................................ ........................ 2-3Corrosion Prevention and Control (CPC)................................ ................................ ................................ ........... 1-1

DDestruction of Army Materiel to Prevent Enemy Use................................ ................................ ......................... 1-1Detachable Microphone................................ ................................ ................................ ................................ ...2-58


Differences Between Models................................ ................................ ................................ ........................... 1-10E

(EIR), Reporting Equipment Improvement Recommendations................................ ................................ ........... 1-1Equipment Characteristics, Capabilities, and Features ................................ ................................ ..................... 1-2Equipment Data ................................ ................................ ................................ ................................ ............. .1-11Equipment/User Fitting Instructions ................................ ................................ ................................ ................ 2-13Expendable/Durable Supplies and Materials List ................................ ................................ ............................. D-1

FFigure and Item Number Index ................................ ................................ ................................ .......................... I-4

HHead Harness ................................ ................................ ................................ ................................ ................ 2-43


Hose Assembly Conversion, Left/Right ................................ ................................ ................................ .......... 2-33How to Use This Manual ................................ ................................ ................................ ................................ ..... iii

Index 1

TM 3-4240-343-20 & PTM 09205A-20 & P/2

INDEX

SUBJECT PAGE

IIdentifying an Individual's Mask................................ ................................ ................................ ....................... 2-12Index (Chapter 2)................................ ................................ ................................ ................................ .............. 2-1Internal Drink Tube................................ ................................ ................................ ................................ .......... 2-40

Checking for Fit ................................ ................................ ................................ ................................ ........ 2-41Installation ................................ ................................ ................................ ................................ ................ 2-40Removal ................................ ................................ ................................ ................................ ................... 2-40

MMaintenance Allocation Chart (MAC)................................ ................................ ................................ ................ B-4Maintenance Forms, Records, and Reports................................ ................................ ................................ .......1-1Maintenance Procedures................................ ................................ ................................ ................................ .2-39Microphone, Detachable ................................ ................................ ................................ ................................ .2-58

Installation ................................ ................................ ................................ ................................ ................ 2-58Removal ................................ ................................ ................................ ................................ ................... 2-58

Microphone................................ ................................ ................................ ................................ ..................... 2-57Installation ................................ ................................ ................................ ................................ ................ 2-57Removal ................................ ................................ ................................ ................................ ................... 2-57

NNational Stock Number Index................................ ................................ ................................ ............................ I-1Nosecup Valve Disks ................................ ................................ ................................ ................................ ...... 2-50


Optical Insert Kit, Plastic ................................ ................................ ................................ ................................ .2-65Adjustment................................ ................................ ................................ ................................ ...................... 2-68


Optical Insert Kit, Wire ................................ ................................ ................................ ................................ ...2-64Installation ................................ ................................ ................................ ................................ ............... 2-44Removal ................................ ................................ ................................ ................................ .................. 2-64

Outlet Valve Cover and Outlet Valve Disk ................................ ................................ ................................ ...... 2-55Installation ................................ ................................ ................................ ................................ ............... 2-56Removal ................................ ................................ ................................ ................................ .................. 2-55

PPort Gasket ................................ ................................ ................................ ................................ .................... 2-63


Preparation for Storage or Shipment ................................ ................................ ................................ .............. 2-77Preventative Maintenance Checks and Services (PMCS) ................................ ................................ .............. 2-29Principles of Operation ................................ ................................ ................................ ................................ ...1-12Putting on Mask Assembly ................................ ................................ ................................ ............................. 2-14

QQuick Disconnect Coupling, External Drink Tube ................................ ................................ ........................... 2-42


Index 2

TM 3-4240-343-20 & PTM 09205A-20 & P/2

INDEX

SUBJECT PAGER

References ................................ ................................ ................................ ................................ ...................... A-1Repair Parts and Special Tools List (RPSTL) ................................ ................................ ................................ .. C-1Repair Parts, Special Tools, TMDE and Support Equipment................................ ................................ ............. 2-3Reporting Equipment Improvement Recommendations (EIR) ................................ ................................ ........... 1-1Reporting Errors and Recommending Improvements ................................ ................................ ........................ 1-1

SSanitizing ................................ ................................ ................................ ................................ ....................... 2-73Second Skin ................................ ................................ ................................ ................................ ................... 2-44


Second Skin, Universal................................ ................................ ................................ ................................ ...2-46Installation ................................ ................................ ................................ ................................ ................ 2-47Removal ................................ ................................ ................................ ................................ ................... 2-46

Second Skin, Universal (USMC only)................................ ................................ ................................ .............. 2-48Installation ................................ ................................ ................................ ................................ ................ 2-49Removal ................................ ................................ ................................ ................................ ................... 2-48

Service Upon Receipt................................ ................................ ................................ ................................ .......2-3Service Upon Receipt of Materiel ................................ ................................ ................................ ..................... 2-3Side Voicemitter, Voicemitter Retainer, and Gasket................................ ................................ ........................ 2-59


Storage or Shipment, Preparation for ................................ ................................ ................................ ............. 2-77Supplies and Materials List, Expendable/Durable ................................ ................................ ............................ D-1Part Number Index ................................ ................................ ................................ ................................ ............ I-2Symptom Index ................................ ................................ ................................ ................................ .............. 2-23

TTable of Contents . ................................ ................................ ................................ ................................ ............ iiTools and Equipment, Common ................................ ................................ ................................ ....................... 2-3Tool and Test Equipment Requirements ................................ ................................ ................................ ........... 2-3Troubleshooting ................................ ................................ ................................ ................................ .............. 2-23

UUnit Maintenance Repair Parts and Special Tools List ................................ ................................ ..................... C-1Unit Maintenance Instructions (See Individual Procedure) ................................ ................................ .............. 2-39Universal Second Skin ................................ ................................ ................................ ................................ ...2-46


Universal Second Skin (USMC only) ................................ ................................ ................................ .............. 2-48Installation................................ ................................ ................................ ................................ ....................... 2-49Removal ................................ ................................ ................................ ................................ ........................ 2-48

VVoicemitter, Side, Voicemitter Retainer and Gasket ................................ ................................ ....................... 2-59


Index 3 (Index 4 blank)

PIN: 074919-000

*tm 3-4240-343-20&p tm 09205a-20&p/2 unit...

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