requirements bulletin - regulations.gov

Commercial Airplanes 737

Requirements BulletinALERT

Number: 737-57A1350 RBOriginal Issue: April 23, 2020ATA System: 5741

SUBJECT: WINGS - Leading Edge Access Panels - Outboard Blowout Door - Detailed Inspection

Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15CFR 300-774). An export license may be required before it is used for development, production or use by foreignpersons from specific countries. The controller of this data has the individual responsibility to abide by all exportlaws.

9E991ECCN:

Copyright © 2020 Boeing.Unpublished Work. All Rights Reserved.

Treatment of this document and its content is governed by contract with Boeing. Rights to use this documentare licensed on a per aircraft basis and such rights may not be transferable. For more information, contact TheBoeing Company.

Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner,BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon andBoeing liveries are all trademarks owned by The Boeing Company; and no trademark license is granted inconnection with this document unless provided in writing by Boeing.

Original Issue: April 23, 2020737-57A1350 RB

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Export Controlled ECCN: 9E991Copyright © Unpublished

Work - See page 1 for details.


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REQUIREMENTS BULLETIN 737-57A1350ALERTALERT

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Table of Contents1. EFFECTIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

A. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5B. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2. CONCURRENT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53. COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64. APPROVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9B. Work Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

FIGURE 1: LEFT WING - FLUID SEAL CONTACT INSPECTION . . . . . . . . . . . . . . . . . . . . 13FIGURE 2: LEFT WING - OUTBOARD BLOWOUT DOOR - DETAILED INSPECTION . . . . . . . . . 16FIGURE 3: LEFT WING - SEALANT APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 19FIGURE 4: LEFT WING - OUTBOARD BLOWOUT DOOR - SEALANT APPLICATION . . . . . . . . . 22FIGURE 5: RIGHT WING - FLUID SEAL CONTACT INSPECTION . . . . . . . . . . . . . . . . . . . 28FIGURE 6: RIGHT WING - OUTBOARD BLOWOUT DOOR - DETAILED INSPECTION . . . . . . . . 31FIGURE 7: RIGHT WING - SEALANT APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 34FIGURE 8: RIGHT WING - OUTBOARD BLOWOUT DOOR - SEALANT APPLICATION . . . . . . . . 37




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Commercial Airplanes 737

Requirements BulletinALERT

Number: 737-57A1350 RBOriginal Issue: April 23, 2020ATA System: 5741

SUBJECT: WINGS - Leading Edge Access Panels - Outboard Blowout Door - Detailed Inspection

THIS DOCUMENT IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN INPARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS DOCUMENTTO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THENEW OWNER. THIS IS AN ENHANCED REQUIRED FOR COMPLIANCE DOCUMENT. THE BOEINGPROCESSES USED TO CREATE THE SERVICE BULLETIN (SB) AND THE REQUIREMENTS BULLETIN(RB) ENSURE THAT THE INFORMATION BETWEEN "RC START" AND "RC END" IN THE SB ARE IDENTICALTO THE INFORMATION IN THE SAME SECTIONS (COMPLIANCE, WORK INSTRUCTIONS…) OF THE RBWHICH THE SB REFERS TO AS THE RELATED DOCUMENT.

1. Effectivity

A. AirplanesThis bulletin is applicable to 737-9 Airplane(s), line number(s) 6834, 6852, 6872, 6899, 6917, 6935,7096, 7173, 7196, 7201, 7208, 7216, 7246, 7253, 7261, 7268, 7306, 7316, 7338, 7348, 7361,7384, 7388, 7394, 7428 in 1 Group(s).

DESCRIPTIONCONFIGURATIONGROUP

737-9 Airplanes-1

Airplane Models:

737-9

GroupVariable Number

11D051 - 1D056

11D101 - 1D114


11D251 - 1D253

11D401


11D466

--

B. Spares AffectedNone.

2. CONCURRENT REQUIREMENTS

None.




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3. COMPLIANCE

The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related toRequirements Bulletin 737-57A1350 RB. The Airworthiness Directive will make the compliance tasks andtimes given in Requirements Bulletin 737-57A1350 RB mandatory.

Accomplish the required action(s), based on the applicable conditions in Tables 1 and 2, in accordancewith Accomplishment Instructions.

When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. Whenmore than one ACTION is given for a CONDITION or an OPTION, do all of the ACTION numbers for thatCONDITION or OPTION.

Table 1: Inspection of the Left Wing - Leading Edge - Outboard Blowout Door.

Repeat Interval(Not to Exceed)

Compliance TimeActionCondition

-Within 12 monthsafter the OriginalIssue date of Re-quirements Bulletin737-57A1350 RB.

(ACTION 1): Do a fluidseal contact inspection.

All Airplanes.

(ACTION 2): Do a de-tailed inspection of theblowout door, inboardand outboard ends of thehinge, for sealant.

--No further action is re-quired for this condition.

CONDITION 1: CONTINU-OUS CONTACT FOUNDDURING FLUID SEALCONTACT INSPECTION.(a)

-Before furtherflight.

Apply sealant to theblowout door surround atall locations aligned towhere continuous contactwas not found.

CONDITION 2: CONTINU-OUS CONTACT NOTFOUND DURING FLUIDSEAL CONTACT INSPEC-TION. (a)


CONDITION 3: INBOARDAND OUTBOARD ENDSOF THE HINGE OFBLOWOUT DOOR ARESEALED. (a)


Apply sealant to the affect-ed blowout door inboardor outboard hinge area.

CONDITION 4: INBOARDOR OUTBOARD ENDS OFTHE HINGE OFBLOWOUT DOOR ARENOT SEALED. (a)

(a) More than one condition can be applicable to each airplane.




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Table 2: Inspection of the Right Wing - Leading Edge - Outboard Blowout Door.

Repeat Interval(Not to Exceed)

Compliance TimeActionCondition

-Within 12 monthsafter the OriginalIssue date of Re-quirements Bulletin737-57A1350 RB.

(ACTION 1): Do a fluidseal contact inspection.

All Airplanes.

(ACTION 2): Do a de-tailed inspection of theblowout door, inboardand outboard ends of thehinge, for sealant.


CONDITION 5: CONTINU-OUS CONTACT FOUNDDURING FLUID SEALCONTACT INSPECTION.(a)


Apply sealant to theblowout door surround atall locations aligned towhere continuous contactwas not found.

CONDITION 6: CONTINU-OUS CONTACT NOTFOUND DURING FLUIDSEAL CONTACT INSPEC-TION. (a)


CONDITION 7: INBOARDAND OUTBOARD ENDSOF THE HINGE OFBLOWOUT DOOR ARESEALED. (a)


Apply sealant to the affect-ed blowout door inboardor outboard hinge area.

CONDITION 8: INBOARDOR OUTBOARD ENDS OFTHE HINGE OFBLOWOUT DOOR ARENOT SEALED. (a)


4. APPROVAL

This Requirements Bulletin was examined by the Federal Aviation Administration (FAA). The changesspecified in this document comply with the applicable regulations and are FAA approved, as well as EuropeanAviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approvedairplanes listed in the service bulletin effectivity.This document and its approval were based on the airplanein its original Boeing delivery configuration or as modified by other Boeing changes.

If an airplane has a non-Boeing modification or repair that affects a component or system also affected bythis Requirements Bulletin, the operator is responsible for obtaining appropriate regulatory agency approvalbefore incorporating this Requirements Bulletin.




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5. ACCOMPLISHMENT INSTRUCTIONS

A. GENERAL INFORMATION

NOTE: 1. This is an Enhanced Required for Compliance document. There will be a separateService Bulletin (SB) and a separate Requirements Bulletin (RB). If an RB is mandatedby an Airworthiness Directive (AD), then all applicable requirements specified in theRB must be done. For the related SB, some locations are marked RC Start and RCEnd to identify the requirements that are restated from the RB. For the related SB,the areas between RC Start and RC End, including sub-steps and any figuresidentified between RC Start and RC End, must be done to comply with the AD.Therefore, an Alternative Method of Compliance (AMOC) is required for any deviationsto steps between RC Start and RC End, including substeps and identified figures.For the related SB, the steps not between RC Start and RC End may be deviatedfrom using accepted methods in accordance with the operator's maintenance orinspection program without obtaining approval of an AMOC; this is provided that thesteps between RC Start and RC End, including sub-steps and identified figures, canstill be done as specified, and the airplane can be put back in an airworthy condition.Figures not required for compliance are omitted from the RB.

2. This is an Enhanced Required for Compliance document. The Boeing processesused to create the Service Bulletin (SB) and the Requirements Bulletin (RB) ensurethat the information between "RC Start" and "RC End" in the SB are identical to theinformation in the same sections (Compliance, Work Instructions...) of the RB whichthe SB refers to as the related document.

3. The compliance times for the actions in WORK INSTRUCTIONS are in Compliance.

4. Unless shown differently, these dimensions and tolerances are used:

– Linear dimensions are in inches– Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus

or minus 0.03 inch– Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch– Angular tolerance is plus or minus 2 degrees– Hole dimensions for standard solid rivets and fasteners are in Structural Repair

Manual (SRM) Chapter 51– Torque Values:

— Values for structural fasteners are given in 737 Structural Repair Manual,Chapter 51.

— Values for airframe maintenance tasks are included in Chapter 20 of 737Aircraft Maintenance Manual (AMM).

— Values for electrical maintenance tasks are included in Chapter 20 ofStandard Wiring Practices Manual (SWPM).

— Values for engine maintenance tasks are included in Chapter 70 of 737Aircraft Maintenance Manual (AMM).

— Non-standard torque values for maintenance tasks are included in theapplicable installation step.




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5. These work instructions refer to procedures included in other Boeing documents.When the words "refer to" are used and the operator has an accepted alternativeprocedure, the accepted alternative procedure can be used. When the words "inaccordance with" are included in the instruction, the procedure in the Boeing documentmust be used.

6. Where the work instructions include installation of a kept part, a new or serviceablepart with the same part number can be installed as an alternative to the kept part.

7. If it is necessary to remove more parts for access, you can remove those parts. Ifyou can get access without removing identified parts, it is not necessary to removeall of the identified parts. Jacking and shoring limitations must be observed.

8. Use the approved fastener, process and material substitutions in accordance withSRM Chapter 51.

9. A Detailed Inspection is defined as: An intensive examination of a specific item,installation or assembly to detect damage, failure or irregularity. This could includetactile assessment in which a component or assembly can be checked fortightness/security. Available lighting is normally supplemented with a direct sourceof good lighting at an intensity deemed appropriate. Inspection aids such as mirrorsand magnifying lenses may be necessary. Surface cleaning and elaborate accessprocedures may be required.

10. When more than one OPTION is given for a CONDITION, do only one of the OPTIONnumbers. When more than one ACTION is given for a CONDITION or an OPTION,do all of the ACTION numbers for that CONDITION or OPTION.

B. WORK INSTRUCTIONS

1. Requirements

Table 1: Detailed Inspection of the Left Wing - Leading Edge - Outboard Blowout Door.

Refer to the listedprocedures in737-57A1350 SBOriginal Issue orlater approved re-visions as an ac-cepted proce-dure.

Method of Compli-ance

ActionCondition

PART 1: OPENACCESS.

-(ACTION 1): Do a fluidseal contact inspection.

All Airplanes.

-FIGURE 1

-FIGURE 2(ACTION 2): Do a de-tailed inspection of theblowout door, inboardand outboard ends of thehinge, for sealant.

PART 2: CLOSEACCESS.

-




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Table 1: Detailed Inspection of the Left Wing - Leading Edge - Outboard Blowout Door.

Refer to the listedprocedures in737-57A1350 SBOriginal Issue orlater approved re-visions as an ac-cepted proce-dure.


ActionCondition


CONDITION 1: CONTINU-OUS CONTACT FOUNDDURING FLUID SEALCONTACT INSPEC-TION.(a)

-FIGURE 3Apply sealant to theblowout door surround atall locations aligned towhere continuous contactwas not found.

CONDITION 2: CONTINU-OUS CONTACT NOTFOUND DURING FLUIDSEAL CONTACT INSPEC-TION.(a)


CONDITION 3: INBOARDAND OUTBOARD ENDSOF THE HINGE OFBLOWOUT DOOR ARESEALED.(a)

-FIGURE 4Apply sealant to the affect-ed blowout door inboardor outboard hinge area.

CONDITION 4: INBOARDOR OUTBOARD ENDS OFTHE HINGE OFBLOWOUT DOOR ARENOT SEALED.(a)





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Table 2: Detailed Inspection of the Right Wing - Leading Edge - Outboard Blowout Door.

Refer to the listedprocedures in737-57A1350 RBOriginal Issue orlater approved re-visions as an ac-cepted proce-dure.


ActionCondition

PART 1: OPENACCESS.

-(ACTION 1): Do a fluidseal contact inspection.

All Airplanes.

-FIGURE 5

-FIGURE 6(ACTION 2): Do a de-tailed inspection of theblowout door, inboardand outboard ends of thehinge, for sealant.

PART 3: CLOSEACCESS.

-


CONDITION 5: CONTINU-OUS CONTACT FOUNDDURING FLUID SEALCONTACT INSPEC-TION.(a)

-FIGURE 7Apply sealant to theblowout door surround atall locations aligned towhere continuous contactwas not found.

CONDITION 6: CONTINU-OUS CONTACT NOTFOUND DURING FLUIDSEAL CONTACT INSPEC-TION.(a)


CONDITION 7: INBOARDAND OUTBOARD ENDSOF THE HINGE OFBLOWOUT DOOR ARESEALED.(a)

-FIGURE 8Apply sealant to the affect-ed blowout door inboardor outboard hinge area.

CONDITION 8: INBOARDOR OUTBOARD ENDS OFTHE HINGE OFBLOWOUT DOOR ARENOT SEALED.(a)





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FIGURE 1: LEFT WING - FLUID SEAL CONTACT INSPECTION(SHEET 1 OF 3)




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The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTYnumbers shown below are the number of parts necessary for one side of the airplane.

More DataQtyIdentificationNameTaskStep

(a)1521ABBLOWOUT DOOROpen1

(b)1521ABBLOWOUT DOORClean2

(c)(d)-MET-L-CHEK (D70 OROPTIONAL D-100)

DEVELOPERApply3

(e)1521ABBLOWOUT DOORClose4


(f)--BLOWOUT DOORSURROUND

Inspect6





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(g)1521ABBLOWOUT DOORClean7

(g)1-BLOWOUT DOORSURROUND

Clean

(a) Open the blowout door. Refer to 737-7/8/8200/9/10 AMM 57-41-02 as an accepted procedure.

(b) Clean blowout door seal and blowout door surround of any dirt or debris.

(c) Apply developer along the blowout door surround common to blowout door seal contact area.

(d) Use bulk material and not the aerosol spray.

(e) Close and latch the blowout door. Refer to 737-7/8/8200/9/10 AMM 57-41-02 as an accepted procedure.

(f) Inspect the amount of developer transferred from the blowout door surround to the blowout door gasket.Make sure that the developer contact on the blowout door gasket is continuous. There is no minimumcontact width required as long as contact exists.

(g) Remove developer from blowout door and blowout door surround.





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FIGURE 2: LEFT WING - OUTBOARD BLOWOUT DOOR - DETAILED INSPECTION(SHEET 1 OF 3)




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(a)2-HINGE SLOTSEALANT

Inspect1

(b)1521ABBLOWOUT DOOROpen2

(c)1-HINGE SLOTSEALANT

Inspect3

(a) With the blowout door closed, do a detailed inspection of the area at the inboard and outboard ends ofthe blowout door hinge for continuous sealant. All visible space at the ends of the hinge to the inboardand outboard edges of the blowout door, and from the forward edge of the blowout door to the aft edgeof the strakelet skin must be continuously filled with sealant and faired to the external surface. If thesealant applied to the internal and external surfaces are not sealed as described, then the space at theinboard and outboard end of the hinge is not sealed.

(b) Open the blowout door. Refer to 737-7/8/8200/9/10 AMM 57-41-02 as an accepted procedure.

(c) With the blowout door open, do a detailed inspection of the hinge area at the inboard and outboard endsof the blowout for continuous sealant along the seal. For the sealant applied to the internal surface to becontinuous, it must be formed to match the profile of the edges of the blowout door and hinge, with nosurface defects, and it must be bonded to the seal and the blowout door surround. If the sealant appliedto the internal and external surfaces are not sealed as described, then the space at the inboard and out-board end of the hinge is not sealed.





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FIGURE 3: LEFT WING - SEALANT APPLICATION(SHEET 1 OF 3)




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---BLOWOUT DOORSURROUND

Clean2

(b)--BLOWOUT DOORSURROUND

Prepare

(c)--BLOWOUT DOORSURROUND

Clean3

(c)-521ABBLOWOUT DOORClean

(d)-FREKOTE 710-NCRELEASE AGENTApply4

(e)-BMS 5-45 B-1/2SEALANTApply5





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(f)1521ABBLOWOUT DOORClose6

(g)(h)(i)-BMS 5-45 B-1/2SEALANTClean7


(b) Abrade any existing cured sealant with 180 grit or finer sandpaper to remove all surface gloss where de-veloper contact is not continuous.

(c) Clean and prepare surfaces for sealant and release agent application at existing seal location on theblowout door and blowout door surround. Refer to SOPM 20-50-19 as an accepted procedure.

(d) Apply two coats of release agent to the blowout door surface in contact with the blowout door surround,allowing 5-10 minutes after each application to cure. Extend the release agent as needed to ease theremoval of sealant squeeze out. Do not apply to the blowout door surround.

(e) Apply sealant BMS5-45, Class B-1/2 or optional BMS 5-182, Type 1, Class B-1/2, or PR-1826 primer andsealant to the areas of the blowout door surround where contact was not made between the blowout doorand blowout door surround. Refer to SOPM 20-50-19 as an accepted procedure.

(f) Close and latch the blowout door. Refer to 737-7/8/8200/9/10 AMM 57-41-02 as an accepted procedure.Make sure 20 minutes has passed after the second application of the release agent before the closing ofthe blowout door.

(g) While the form-in-place gasket sealant is still wet, remove the excess sealant between the edges of bothdoor and the blowout door surround, fair the sealant at support structure edges and wait for the sealantto dry.

(h) After the sealant dries, open and close the blowout door to break it free from the sealant. After cyclingthe door, the door should open without assistance. Make sure that the sealant bonds to the blowout doorsurround and not the blowout door. Remove any sealant that has adhered to the blowout door. Refer toSOPM 20-50-19 as an accepted procedure. Petrolatum or Krytox may be applied to the door as a postcure lubricant. If petrolatum is applied to the door after the sealant has cured, it must be wiped off with alint-free rag leaving behind a thin film. If Krytox is used, it does not have to be wiped off.

(i) Make sure sealant has formed along the existing seal on the blowout door surround at the areas wherecontact was not made.





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FIGURE 4: LEFT WING - OUTBOARD BLOWOUT DOOR - SEALANT APPLICATION(SHEET 1 OF 6)




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(b)-521ABBLOWOUT DOORClean2


Clean

(c)-FREKOTE 710-NCRELEASE AGENTApply3

(d)-BMS 5-45 B-1/2SEALANTApply4


(f)-BMS 5-45 B-1/2SEALANTApply6

(g)(h)-BMS 5-45 B-1/2SEALANTClean7


(b) Clean and prepare surfaces for sealant and release agent application, at both ends of the blowout doorhinge, blowout door surround and blowout door. Refer to SOPM 20-50-19 as an accepted procedure.

(c) Apply two coats of release agent to the blowout door inner surface and edges that will be in contact withwet sealant and blowout door surround, allowing 5-10 minutes after each application to cure. Allow 20minutes after the second application before closing the door. Extend the release agent as needed to easethe removal of sealant squeeze out. As an option you may apply the Frekote to the entire side of the doorpanel. Do not apply to the door surround structure.

(d) Apply sealant BMS5-45, Class B-1/2 or optional BMS 5-182, Type 1, Class B-1/2, or PR-1826 primer andsealant to the space between the blowout door and the blowout door surround. Refer to SOPM 20-50-19as an accepted procedure. Make sure sealant is backfilled into the recesses in the space before toppingoff. Apply enough sealant so that excess will squeeze out and make sure the space is completely filled.


(f) While the sealant is still wet, remove the squeeze-out sealant between the edges of both blowout doorand the blowout door surround, except in the area of the intended filled space shown in view F and G.Fair the sealant in the area with the surrounding external surfaces so that the faired sealant has filled thespace completely, and wait for the sealant to dry.

(g) After the sealant dries, open and close the blowout door to break it free from the sealant. After cyclingthe door, the door should open without assistance. Make sure that the sealant bonds to the door structureand not the blowout door. Refer to SOPM 20-50-19 as an accepted procedure. Krytox or Petrolatum maybe applied to the door as a post-cure lubricant. If petrolatum is applied to the door after the sealant hascured, it must be wiped off with a lint-free rag leaving behind a thin film. If Krytox is used, it does not haveto be wiped off.





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(h) With the blowout door open, make sure the sealant has formed to continuously match the profile of theedges of the blowout door and hinge half, with no surface defects, and make sure it is bonded to the bulbseal and the surround structure inboard and outboard of the bulb seal. With the blowout door closed,make sure all visible space inboard and outboard of the ends of the hinge to the inboard and outboardedges of the door, and from the forward edge of the door to the aft edge of the strakelet skin are continu-ously filled with sealant and faired to the external surface.





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FIGURE 5: RIGHT WING - FLUID SEAL CONTACT INSPECTION(SHEET 1 OF 3)




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(b)1621ABBLOWOUT DOORClean2

(c)(d)-MET-L-CHEK (D70 OROPTIONAL D-100)

DEVELOPERApply3



(f)--BLOWOUT DOORSURROUND

Inspect6





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(g)1621ABBLOWOUT DOORClean7

(g)1-BLOWOUT DOORSURROUND

Clean


(b) Clean blowout door seal and blowout door surround of any dirt or debris.

(c) Apply developer along the blowout door surround common to blowout door seal contact area.

(d) Use bulk material and not the aerosol spray.


(f) Inspect the amount of developer transferred from the blowout door surround to the blowout door gasket.Make sure that the developer contact on the blowout door gasket is continuous. There is no minimumcontact width required as long as contact exists.

(g) Remove developer from blowout door and blowout door surround.





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FIGURE 6: RIGHT WING - OUTBOARD BLOWOUT DOOR - DETAILED INSPECTION(SHEET 1 OF 3)




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(a)1-HINGE SLOTSEALANT

Inspect1

(b)1621ABBLOWOUT DOOROpen2

(c)1-HINGE SLOTSEALANT

Inspect3

(a) With the blowout door closed, do a detailed inspection of the area at the inboard and outboard ends ofthe blowout door hinge for continuous sealant. All visible space at the ends of the hinge to the inboardand outboard edges of the blowout door, and from the forward edge of the blowout door to the aft edgeof the strakelet skin must be continuously filled with sealant and faired to the external surface. If thesealant applied to the internal and external surfaces are not sealed as described, then the space at theinboard and outboard end of the hinge is not sealed.

(b) Open the blowout door. Refer to 737-7/8/8200/9/10 AMM 57-41-02 as an accepted procedure.

(c) With the blowout door open, do a detailed inspection of the hinge area at the inboard and outboard endsof the blowout for continuous sealant along the seal. For the sealant applied to the internal surface to becontinuous, it must be formed to match the profile of the edges of the blowout door and hinge, with nosurface defects, and it must be bonded to the seal and the blowout door surround. If the sealant appliedto the internal and external surfaces are not sealed as described, then the space at the inboard and out-board end of the hinge is not sealed.





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FIGURE 7: RIGHT WING - SEALANT APPLICATION(SHEET 1 OF 3)




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-1-BLOWOUT DOORSURROUND

Clean2


Prepare

(c)--BLOWOUT DOORSURROUND

Clean3

(c)-621ABBLOWOUT DOORClean

(d)-FREKOTE 710-NCRELEASE AGENTApply4

(e)-BMS 5-45 B-1/2SEALANTApply5





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(f)1621ABBLOWOUT DOORClose6

(g)(h)(i)-BMS 5-45 B-1/2SEALANTClean7


(b) Abrade any existing cured sealant with 180 grit or finer sandpaper to remove all surface gloss where de-veloper contact is not continuous.

(c) Clean and prepare surfaces for sealant and release agent application at existing seal location on theblowout door and blowout door surround. Refer to SOPM 20-50-19 as an accepted procedure.

(d) Apply two coats of release agent to the blowout door surface in contact with the blowout door surround,allowing 5-10 minutes after each application to cure. Extend the release agent as needed to ease theremoval of sealant squeeze out. Do not apply to the blowout door surround.

(e) Apply sealant BMS5-45, Class B-1/2 or optional BMS 5-182, Type 1, Class B-1/2, or PR-1826 primer andsealant to the areas of the blowout door surround where contact was not made between the blowout doorand blowout door surround. Refer to SOPM 20-50-19 as an accepted procedure.

(f) Close and latch the blowout door. Refer to 737-7/8/8200/9/10 AMM 57-41-02 as an accepted procedure.Make sure 20 minutes has passed after second application of release agent before closing the blowoutdoor.

(g) While the form-in-place gasket sealant is still wet, remove the excess sealant between the edges of bothdoor and the blowout door surround, fair the sealant at support structure edges and wait for the sealantto dry.

(h) After the sealant dries, open and close the blowout door to break it free from the sealant. After cyclingthe door, the door should open without assistance. Make sure that the sealant bonds to the blowout doorsurround and not the blowout door. Remove any sealant that has adhered to the blowout door. Refer toSOPM 20-50-19 as an accepted procedure. Petrolatum or Krytox may be applied to the door as a postcure lubricant. If petrolatum is applied to the door after the sealant has cured, it must be wiped off with alint-free rag leaving behind a thin film. If Krytox is used, it does not have to be wiped off.

(i) Make sure sealant has formed along the existing seal on the blowout door surround at the areas wherecontact was not made.





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FIGURE 8: RIGHT WING - OUTBOARD BLOWOUT DOOR - SEALANT APPLICATION(SHEET 1 OF 6)




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(b)-621ABBLOWOUT DOORClean2


Clean

(c)-FREKOTE 710-NCRELEASE AGENTApply3

(d)-BMS 5-45 B-1/2SEALANTApply4


(f)-BMS 5-45 B-1/2SEALANTApply6

(g)(h)-BMS 5-45 B-1/2SEALANTClean7


(b) Clean and prepare surfaces for sealant and release agent application at both ends of the blowout doorhinge, blowout door surround and blowout door. Refer to SOPM 20-50-19 as an accepted procedure.

(c) Apply two coats of release agent to the blowout door inner surface and edges that will be in contact withwet sealant and blowout door surround, allowing 5-10 minutes after each application to cure. Allow 20minutes after the second application before closing the door. Extend the release agent as needed to easethe removal of sealant squeeze out. As an option you may apply the Frekote to the entire side of the doorpanel. Do not apply to the door surround structure.

(d) Apply sealant BMS5-45, Class B-1/2 or optional BMS 5-182, Type 1, Class B-1/2, or PR-1826 primer andsealant to the space between the blowout door and the blowout door surround. Refer to SOPM 20-50-19as an accepted procedure. Make sure sealant is backfilled into the recesses in the space before toppingoff. Apply enough sealant so that excess will squeeze out and make sure the space is completely filled.

(e) Close and latch door assembly. Refer to 737-7/8/8200/9/10 AMM 57-41-02 as an accepted procedure.

(f) While the sealant is still wet, remove the squeeze-out sealant between the edges of both blowout doorand the blowout door surround, except in the area of the intended filled space shown in view F and G.Fair the sealant in the area with the surrounding external surfaces so that the faired sealant has filled thespace completely, and wait for the sealant to dry.

(g) After the sealant dries, open and close the blowout door to break it free from the sealant. After cyclingthe door, the door should open without assistance. Make sure that the sealant bonds to the door structureand not the blowout door. Refer to SOPM 20-50-19 as an accepted procedure. Krytox or Petrolatum maybe applied to the door as a post-cure lubricant. If petrolatum is applied to the door after the sealant hascured, it must be wiped off with a lint-free rag leaving behind a thin film. If Krytox is used, it does not haveto be wiped off.





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(h) With the blowout door open, make sure the sealant has formed to continuously match the profile of theedges of the blowout door and hinge half, with no surface defects, and make sure it is bonded to the bulbseal and the surround structure inboard and outboard of the bulb seal. With the blowout door closed,make sure all visible space inboard and outboard of the ends of the hinge to the inboard and outboardedges of the door, and from the forward edge of the door to the aft edge of the strakelet skin are continu-ously filled with sealant and faired to the external surface.





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requirements bulletin - regulations.gov

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