water & caste

8/17/2019 Water & Caste

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For training purposes onlyLEVEL 3 ATA 38

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B737NG/38/301Water & Waste

Boeing B737-600/700/800/900

Training manual

Water & Waste


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B737NG/38/301Water & WasteTraining manual

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This publication was created by Sabena technics training department,

Brussels-Belgium, following ATA 104 specications.

The information in this publication is furnished for informational and training

use only, and is subject to change without notice.

Sabena technics training assumes no responsibility for any errors or

inaccuracies that may appear in this publication.

No part of this publication may be reproduced, stored in a retrieval system,

or transmitted, in any form or by any means, electronic, mechanical,

photocopying, recording, or otherwise, without the prior written permission

of Sabena technics training.

Contact address for

course registrations

course schedule information

Sabena technics training

[email protected]


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LIST OF EFFECTIVE PAGES


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1. GENERAL. ................................................................................................61.1. Potable Water System. ...........................................................................61.2. Waste Disposal System. ..........................................................................61.3. Component Location. ............................................................................8

2. POTABLE WATER ..................................................................................102.1. System Description...............................................................................10

2.2. Water Tank. .........................................................................................122.3. Potable Water Service Panel. ................................................................142.4. Fill / Overflow Valve and Control Cable. ...............................................162.5. Water Tank Drain Valve and Control Cable. ..........................................182.6. Water Quantity Indication System. .......................................................202.7. Water Tank Pressuriation. ...................................................................24

3. LAVATORY. ............................................................................................283.1. Lavatory Water Supply Shutoff Valve. ...................................................283.2. FWD Lavatory Drain Valve. ...................................................................283.3. Water Heater. ......................................................................................303.4. Lavatory Faucet. ...................................................................................32

4. GRAY WATER. .......................................................................................344.1. Drain Mast. ..........................................................................................344.2. Door Sill Drain......................................................................................344.3. Door Sill Drain Bladder. ........................................................................36

5. VACUUM WASTE SYSTEM. ..................................................................385.1. System Description...............................................................................385.2. Waste QTY Indication. .........................................................................405.3. Toilet Assembly. ...................................................................................425.4. Vacuum System - Component Locations. .............................................465.5. Waste Tank. .........................................................................................485.6. Waste Tank Sensors. ............................................................................505.7. Vacuum Blower & Filter . ......................................................................565.8. Vacuum Blower Operation. ..................................................................585.9. Waste Drain Ball Valve. ........................................................................625.10. Vacuum Waste Line Clean-out Fitting. ................................................645.11. Waste Tank Rinse System. ..................................................................665.12. Logic Control Module. .......................................................................685.13. LCM - Details. ....................................................................................70


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TABLE OF CONTENTS


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A/C Air ConditioningAMM Aircraft Maintenance ManualCLS Continuous level sensorCONT ControlE EmptyF FullFCU Flush Control UnitFWD ForwardIND IndicationLAV LavatoryLCM Logic Control ModulePLS Point Level SensorQTY QuantityREF ReferenceTYP Typical

AFT CARGO COMPARTMENT .................................................................................................47CONTINUOUS LEVEL SENSOR.................................................................................................53DOOR SILL DRAIN BLADDER................................................................................................... 37FILL/OVERFLOW VALVE .......................................................................................................... 17GRAY WATER .........................................................................................................................35LAVATORY .............................................................................................................................43LAVATORY FAUCET ................................................................................................................33LAVATORY WATER SUPPLY SHUTOFF VALVE ........................................................................... 29

LCM - DETAILS .......................................................................................................................71LIQUID SEPARATOR ................................................................................................................49LOGIC CONTROL MODULE ...................................................................................................69OPERATION............................................................................................................................45POINT LEVEL SENSORS ........................................................................................................... 51POTABLE WATER ....................................................................................................................11POTABLE WATER SERVICE PANEL ........................................................................................... 15PRESSURIzATION COMPONENTS ............................................................................................ 27VACUUM BLOWER BAROMETRIC SWITCH ............................................................................. 61VACUUM BLOWER & FILTER ...................................................................................................57VACUUM BLOWER - OPERATION ........................................................................................... 59VACUUM WASTE LINE CLEAN-OUT FITTING ...........................................................................65VACUUM WASTE - MECHANICAL .......................................................................................... 39WASTE DRAIN BALL VALVE .................................................................................................... 63WASTE QTY INDICATION .......................................................................................................41WASTE QTY INDICATION .......................................................................................................55WASTE SYSTEM ..................................................................................................................... 73WASTE TANK ......................................................................................................................... 49WATER HEATER......................................................................................................................31WATER QTY INDICATION ....................................................................................................... 23WATER QUANTITY INDICATION SYSTEM ................................................................................21WATER TANK .........................................................................................................................13

WATER TANK ........................................................................................................................27WATER TANK DRAIN VALVE ...................................................................................................19WATER TANK PRESSURIzATION SYSTEM ................................................................................ 25WATER TANK RINSE SYSTEM..................................................................................................67WATER / WASTE COMPONENT LOCATION ............................................................................... 9WATER / WASTE - GENERAL .....................................................................................................7


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ABBREVIATIONS AND ACRONYMSLIST OF ILLUSTRATIONS


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1. GENERAL.

1.2. Waste Disposal System.

There are two types of waste, gray water and human waste.Gray water comes from the sink drains in the lavatories and galleys.It flows to overboard drain masts.

The vacuum waste system removes human waste material from the toilets.The waste material collects in the waste tank.

The waste tank quantity indication system measures and shows the level ofwaste material in the waste tank.The waste tank quantity indication is at the aft attendant panel.

1.1. Potable Water System.

The potable (drinking) water system keeps water in a water tank.

The water tank pressuriation system gives the water tank pressuried air.This pushes the water through distribution lines to the galleys and lavatories.

Each lavatory has a sink and a vacuum toilet that use potable water.The water quantity indication system measures and shows the level of water inthe water tank.The water tank quantity indication is at the aft attendant panel.


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WATER / WASTE - GENERAL

rechauffer au sol 28VAC

en vol 115 vdc


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WATER / WASTE COMPONENT LOCATION

Air compressor inhibited


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2. POTABLE WATER

Training Information Point.When you drain the water system, you must drain water fromthese two areas :

- The water service panel,- The forward lavatory.

The water service panel lets you drain the water tank and aft supply lines.The forward lavatory has a drain valve downstream of the water supply shutoffvalve.The forward lavatory drain valve lets you drain the forward water supply lines.When you drain water from the forward lavatory, you must have the watersupply shutoff valve open.

WARNING : YOU MUST DRAIN THE POTABLE WATER SYSTEM AT LEASTONE TIME EVERY THREE DAYS TO PREVENT THE GROWTH OFBACTERIA IN THE SYSTEM.IF YOU DO NOT DRAIN THE SYSTEM AT LEAST ONE TIMEEVERY THREE DAYS AND YOU DRINK THE WATER, ILLNESS CANOCCUR.

It is necessary to fully drain the water system before you add a disinfectant orwhen you park the airplane in cold weather.

It is necessary to rinse and drain the water system when you park the airplanein cold weather.

2.1. System Description.

The water system has one tank that holds potable water.You fill and drain the water tank at the water service panel.There are control handles for the fill/overflow valve and the water tank drainvalve.

The water drains overboard through drain fittings.

The water tank supplies water to these locations :

- Galley faucets,- Lavatory faucets,- Lavatory toilets.

Each lavatory has a water supply shutoff valve.The valve lets you isolate the water supply to the sink or to the toilet.The valve also lets you isolate both the sink & toilet at the same time.

The forward lavatory has a drain valve.This valve drains water from the forward water supply lines.

A water heater in each lavatory increases the temperature of the water.The water goes to the hot side of the faucet.

The water tank level sensor sends the water quantity data to a water quantitytransmitter.The transmitter sends the information to a water quantity indicator at the aftattendant panel.The water quantity indicator shows the level of water in the tank.


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FWD DRAIN

MAST

DRAIN/OVERFLOW

DRAIN

HANDLEFILL

FILL

HANDLE

COMPRESSOR

CUT OUT

SWITCH

SENSOR

60 PSI

PRESS

SWITCH

REG

±35 PSI

M

TYP. AFT LAV AFT GALLEY

- F

- 3/4

- 1/2

- 1/4

- E

POTABLEQTY INDICATOR

(AFT ATTENDANT)

AFT DRAINMASTDRAIN

FWD GRAY WATER DRAINLINE

CAB FLOOR

WATER SUPPLY SOV - OFF - SUPPLY ON - TOILET ONLY - FAUCET ONLY

FWD LAV DRAIN VALVE- OPEN- CLOSED

FWD LAV FWD GALLEY

CAB FLOOR

ON OFFCTLRELAY

(R184)

40 PSI 30 PSI

115 VAC MAIN BUS 1

DRAIN VALVE

AIR COMPRESSOR

PNEUM.SYST.

SVC PANEL CLOSED

FILL/OVERFLOW VALVE

WATERSERVICE PANEL

QTY XMTR

WATER SUPPLY SOV - OFF- SUPPLY - TOILET ONLY - FAUCET ONLY

MED

LOWHI

TYPICAL

HEATER

ON

OFF

RESET

OPEN

C873 (P91)

POTABLE WATER40 PSI

as de fuite

is pas obliger de couper

e l'alimentation

indication sur attendand

panel

P14


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2.2. Water Tank.

Purpose.The water tank holds potable water.

Location.The water tank is in the aft area of the aft cargo compartment.You must remove the aft bulkhead cargo lining to get access to the tank.

Physical Description.The water tank is graphite filament wound.It has a (PETG) food grade plastic liner inside.

The water level sensor is a copper mesh capacitance sensor bonded onto

the tank liner.

It is a permanent internal part of the tank

.

Training Information Point.There are two water tank sies and each tank can have one of three standpipes installed.

The tanks and the stand pipes are interchangeable for different routerequirements.Whenever you install a different tank and/or stand pipe, you must also changethe water quantity transmitter adapter cable.If you do not use the correct transmitter adapter cable, the water quantity

indicator will not show the correct water level.

The 45 gallon tank can have a 113 liter / 30usg standpipe ora 151 liter / 40 usg standpipe.

The 62.1 gallon tank can have these sies of standpipes :

• 151 liter (40 gallon)• 189 liter (50 gallon)• 227 liter (60 gallon)souder


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WATER TANK

air compressor


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2.3. Potable Water Service Panel.

The water service panel lets you fill the potable water system.The service panel also has some drain functions.

Location.The water service panel is at the aft section of the fuselage, bottom right side.There are two snap latches to open the service panel door.

Access to the inside of the service panel is from the aft cargo compartment.

Functional Description.The water service hose connects to the tank fill port (fitting).The tank fill valve handle lets you open the fill/overflow valve.The fill/overflow valve permits water to fill the tank.It also permits air to flow overboard from the tank during the fill process.When the tank is at its maximum capacity, water will flow overboard throughthe overflow drain line.

To drain the tank, you open the drain valve.This will let water flow out of the tank and the aft distribution lines.

The compressor cut out switch stops operation of the air compressor when

the water service panel door is open.

Interference brackets on the service panel door prevent the door from closingif a valve handle is in the wrong position for flight.


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POTABLE WATER SERVICE PANEL


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2.4. Fill / Overflow Valve and Control Cable.

The fill / overflow valve has these functions :

- Lets water flow into the water tank from the service panel fill port- Lets air out of the water tank to vent overboard as the tank fills with

water- Lets water flow overboard when water volume reaches the stand pipe- Depressuries the water tank for system service or maintenance.

The control cable lets you open and close the fill/overflow valve from theservice panel.

Location.The fill/overflow valve is on the right side of the aft cargo compartment.It has an attachment above and outboard of the water tank.

Functional Description.The valve is a four-port rotary valve.The control cable is a rotary-in rotary-out type.

The control cable has a rotary actuator input at the service panel.It transmits motion to the valve at a rotary actuator on the valve.

When you put the fill/overflow valve in the open position, the service panel fillline connects to the tank fill line and the tank stand pipe line connects to theoverflow skin fitting.

When you put the valve in the close position, the service panel fill lineconnects to the overflow line and the tank fill line connects to the tank standpipe line.


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2.5. Water Tank Drain Valve and Control Cable.

The water tank drain valve lets water drain overboard from the water tank andthe aft water distribution lines.

The control cable operates the valve from the service panel.

Location.The drain valve is behind the aft bulkhead of the aft cargo compartment.

It is forward and below the water tank.

The control cable is below the cargo floor and is between the water servicepanel and the water tank drain valve.

Physical Description.The water tank drain valve is a two port, single ball dual seal valve.It operates by manual input and has open and closed positions.

The control cable is a rotary-in rotary-out type.It has a control handle rotary actuator (input) and a valve rotary actuator.(output).

Functional Description.The control cable sets the position of the drain valve through the controlhandle.The control handle is on the water service panel.The control cable attaches to the water drain valve through the control cable

rotary actuator (output).

Training Information Point.You must drain the water system at two locations to remove all the water inthe passenger water system.Use the forward lavatory drain valve and the water tank drain valve tocompletely drain the water system.


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2.6. Water Quantity Indication System.

General.The water quantity indication system measures and shows the quantity ofwater in the water tank.

These are the water quantity indication components :

- Water level sensor (bonded inside water tank),

- Water quantity transmitter and adapter cable,- Water quantity indicator.

The water level sensor is a copper mesh capacitance type sensor that is part ofthe water tank.

The water quantity transmitter uses the measurement signal from the sensorto calculate the water level.

The adapter cable gives pin-programing to the transmitter for tank/stand pipeconfigurations.

The water level shows at the aft attendant panel on the water quantityindicator.

Functional Description.The water quantity transmitter receives 28V DC from bus 1.The water quantity transmitter reads the capacitance of the water level sensorin the tank and supplies a 0 to -10V DC output to the water quantity indicator.

Training Information Point.There are two adjustment screws in the water quantity transmitter.One adjustment screw changes the output voltage when the water tank isempty.

The other adjustment screw changes the output voltage when the water tankis full.The adjustment screws are behind a coverplate on the water quantitytransmitter.

There are different adapter cables for each water tank standpipeconfiguration.If you change the water tank or standpipe, you must also change the adaptercable.If you do not change the adapter cable, the water tank quantity will not becorrect.


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WATER QUANTITY INDICATION SYSTEM

quantite transmiter


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Water Quantity Indicator.The water quantity indicator shows the level of water in the water tank.

Location.The water quantity indicator is part of the potable water module on the aftattendant panel.The aft attendant panel is at the aft attendant station, adjacent to the aftentry door.

Physical Description.The water quantity indicator is a LED segment display.The segments are from E (empty) to F (full), in increments of 1/8 of a tank.

Functional Description.The capacitance of the water tank level sensor changes when the water levelin the water tank changes.

The water quantity transmitter senses the capacitance of the water tank levelsensor and changes the capacitance input to a 0 to -10V DC output voltage.The output voltage of the water quantity transmitter is in proportion to thequantity of water in the water tank.

The potable water module on the attendant panel senses the output voltageof the water quantity transmitter.The 0 to -10V DC input voltage is changed to a digital signal and used tooperate an LED array.The LEDs in the array show as a continuods display on the water quantity

indicator.The water quantity indicator shows water quantity as a percentage of full,with 1/8 tank intervals.

Training Information Point.

NOTE : The E (tank empty) LED on the water quantity indicator will always beon when power is available.

NOTE : If the water tank is not correctly grounded, intermittent operation ofthe water quantity indicator can occur.


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WATER QTY INDICATION


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2.7. Water Tank Pressurization.

The water tank pressuriation system uses pressuried air from the pneumaticsystem or the air compressor to pressurie the water tank.

Pneumatic System.The pneumatic system supplies pressuried air to the water tank when thepneumatic system is on.

The pneumatic system supply line gets air from a tap on the pneumaticmanifold forward of the APU check valve.

An in-line air filter cleans the air in the pneumatic system supply line.

A pressure regulator controls the pneumatic system supply line pressure to amaximum of 35 psig.

Air Compressor.The air compressor supplies pressuried air to the water tank when thepneumatic system is off and these conditions are true :

- Pressure in the water tank is less than 30 psig(pressure limit switch is closed)

- Water service panel door is closed (compressor cut-out switch is closed)- 115V AC main bus 1 is on.

The air compressor gets air from a muffler above the ceiling of the cargo

compartment.An air filter at the inlet of the air compressor cleans the air in the aircompressor supply line.

The pressure limit switch opens and stops the operation of the air compressorwhen the air pressure in the water tank increases to 40 psig.When the pressure decreases to 30 psig, the pressure limit switch closes andthe air compressor starts.


WARNING: SEAL THE CARGO COMPARTMENT WITH THE LINING. OBEYTHE INSTRUCTIONS IN THE SPECIFIED PROCEDURE WHEN YOUINSTALL THE LINING.IF YOU INSTALL THE LINING INCORRECTLY, THE FIREEXTINGUISHING AGENT OR SMOKE CAN GET INTO THEPASSENGER COMPARTMENT DURING A FIRE.

To get access to the water tank pressuriation system components, youremove the cargo compartment lining.When you are done, you must replace and seal the cargo compartment lining.

Before you remove water tank pressuriation system components, you mustrelease the pressure from the system.You can open the fill/overflow valve to release the pressure from thepneumatic pressure lines.To open the fill/overflow valve, use the valve handle at the water service panel.

To stop operation of the air compressor, open the water service panel.

Component Description.The water tank pressuriation components are in the aft cargo compartment.


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WATER TANK PRESSURIZATION SYSTEM


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There are two areas :

- Water tank system access,- Waste system access.

Air Compressor & Inlet Air Filter.The compressor is on the left side of the aft cargo compartment.

You must remove the forward waste access panel to get access to thecompressor.

The compressor attaches to the lower side the vacuum blower support shelf.

The water tank air compressor operates

when the compressor controlrelay energies.

-The water service door is closed and,

- Water tank pressure is below 30 psig.

Open the water system service panel to stop operation of the air

compressor. Open the fill/overflow valve to depressurie the water tank.The compressor inlet air filter element is replaceable.

Pressure Limit SwitchThe pressure limit switch is in the aft cargo compartment behind the aftbulkhead.You must remove the water tank access panel to get access to it.

The switch starts the air compressor when the pressure in the water tank is 30

psig or less.The switch stops the air compressor when the pressure in the water tank is 40psig.

Pressure Regulator.The pressure regulator keeps the air pressure from the pneumatic system to alimit of 35 psig.

The pressure regulator is in the aft cargo compartment.It is part of the pneumatic equipment installation forward and above the watertank.You must remove the cargo compartment ceiling lining to get access to thepneumatic equipment installation.

Check Valve.There is a check valve in the air compressor supply line and the pneumaticsupply line.

Pressure Relief Valve.If pressure in the pneumatic supply line increases to approximately 60 psi, thepressure relief valve opens.The valve resets at approximately 55 psi.

In-line Air Filter.The filter element is a 10-20 microns paper filter element and is replaceable.You must remove the bowl to get access to the filter element.


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WATER TANK

PRESSURIZATION COMPONENTS


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3. LAVATORY.

3.2. FWD Lavatory Drain Valve.

The forward lavatory drain valve lets you drain the water from the forwardlavatory supply lines.

The valve control handle permits you to put the valve in the OPEN or CLOSEposition.

In the OPEN position, the valve lets the water drain from all the forwardlavatory and galley supply lines.The water drains through the forward drain fitting.

In the CLOSE position, the water from the supply lines flows to the lavatoryand galley components.Water does not flow overboard.

A placard shows the valve in the OPEN and CLOSE positions.

Training Information Point.You must put the forward lavatory drain valve in the CLOSE position for flight.

You must put the forward lavatory drain valve in the CLOSE position beforeyou service the water system.If you do not put the valve in the CLOSE position, water will drain from the

forward lavatory during operation.

3.1. Lavatory Water Supply Shutoff Valve.

The lavatory water supply shutoff valve lets you isolate the flow of water tothe lavatory components.

The valve has one line in and two lines out.

The valve control handle lets you to put the valve in one of four positions :

- OFF.When you turn the valve to the OFF position, the valve shuts off waterto all of the lavatory components.

- Toilet only.In the TOILET ONLY position, water will flow to the toilet only.

- Supply on.When the valve is in the SUPPLY ON position, water will flow to thefaucet and toilet.

- Faucet Only.In the FAUCET ONLY position, water will flow to the faucet only.

Training Information Point.Before you do work on the lavatory components, put the lavatory watersupply shutoff valve in the OFF position.This will prevent water flow through any open lines.

You must put the lavatory water supply shutoff valve in the SUPPLY ONposition when you drain the forward lavatory supply lines.


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3.3. Water Heater.

The lavatory water heaters increase the temperature of water for use in thehot water faucet.

Location.There is a water heater in each lavatory.You open the sink cabinet door to get access to it.

The overheat switch is under the water heater cover.

Physical Description.The temperature selector switch sets the water temperature to one of thesethree temperatures :

- LOW (40°C/105°F)- MEDIUM (46°C/115°F)- HIGH (52°C/125°F).

The power indicator light shows that power is available and that the overheatswitch is closed (no overheat).

The overheat switch opens when the water temperature is more than 76°C(170°F).

The pressure relief valve opens if pressure inside the water heater is more than140 psig.

Functional Description.When the power switch is in the ON position, 115V AC power goes to thecontrol electronics.

You can see the orange indicator light is on when the heater operates.

The temperature selector switch sets the temperature of the water heater(LOW, MEDIUM, or HIGH).

If the water is too cold, the control electronics connects power to the heaterelements.

If the water is at the correct temperature, the control electronics disconnectspower from the heater elements.

The overheat switch is a fail-safe device that is a back up to the controlelectronics. The overheat switch opens the power circuit if the watertemperature is more than 76°C (170°F).

Training Information Point.If the power switch is ON and the indicator light is off, do these steps :

- Make sure power is available to the unit,- Reset the overheat switch.

If the water heater overheats, you must remove the heater cover and reset theoverheat switch.

Open the circuit breaker for the water heaters when you drain the watersystem.

Remove the lid to get access to the reset switch.You push the center of the rubber cover over the overheat switch to reset the

heater.

The rubber cover on the reset switch is to isolate electrical power.Do not use a sharp object to push the reset switch.


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WATER HEATER

reset:

on appuyant dessus


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3.4. Lavatory Faucet.

The lavatory faucet controls the hot and cold water supply to the lavatory sink.

Location.There is a faucet in each lavatory.It is on the sink deck back splash.

Physical Description.

These are the parts on the outside of the faucet :

- Hot button,- Decorative cover,- Attach screw,- Reducer,- Drain button,- Cold button.

These are the parts in the faucet :

- Return springs (2),- Adjusting screws (2),- Shoulder screws (2),- Cartridge valve plungers (2).

The attach screw and the reducer attach the decorative cover to the faucet.

The adjustments screw lets you adjust the water flow from 4 seconds to 10seconds.

There is an adjustment screw for the hot and the cold water flows.

Functional Description.The hot and cold buttons each operate a cartridge valve plunger.The plungers permit water to flow through for a specified time.

The faucets are self venting.They do not need to be open to drain the system.


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4. GRAY WATER.

4.2. Door Sill Drain.

The door sill drain system removes rain water from the door sill areas.

The door sills are lower than the adjacent floor area and channel water to thedoor sill drains.The door sill drains direct the rain water to the drain bladders.

When the airplane is on the ground, the drain valves in the bladders are openand the water drains overboard through a drain fitting on the bottom of theairplane.

When the airplane is in the air, the flapper valves are closed and the water thatremains is kept in the bladders.

On Some Airplanes.When the airplane is in the air, differential pressure closes the sill drain checkvalves, and any remaining water is held in the system.

4.1. Drain Mast.

The drain masts let waste water from the lavatory and galley sinks flowoverboard.

The drain masts have internal heaters that keep the waste water fromfreeing.

There are two drain masts on the lower fuselage.

The drain mast is an aerodynamic fairing that attaches to the fuselage.

The waste water drains overboard through the drain masts when the airplaneis on the ground and when the airplane is in the air.

Electrical heaters in the drain masts prevent the drain masts from freeing.(ATA 30)

Each drain mast has an internal 250 watt heater.

Training Information Point.The heater on the forward drain mast connects to the airplane wiring throughan electrical connector.

The heater on the aft drain mast connects to the airplane wiring through wiresplices.When you replace the aft drain mast, you must make a splice in the wires.

CAUTION : WHEN YOU REMOVE THE FASTENERS, HOLD THE DRAIN MAST.IF THE DRAIN MAST FALLS, DAMAGE CAN OCCUR.


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4.3. Door Sill Drain Bladder.

The door sill drain bladder keeps rain water that has drained from the door

sill areas when the airplane is in the air.

Location.The door sill drain bladder for the forward door sill drain system is in theEE compartment on the forward left side, outboard of the E1 rack.

The door sill drain bladder for the aft door sill drain system is behind the aftcargo compartment, aft of the water tank.

Physical Description.The door sill drain bladder has a top half and a bottom half.The two halves of the door sill drain bladder are made of silicone rubber.The two halves of the door sill drain bladder are glued together to give awatertight seal.A valve assembly in the bottom of the door sill drain bladder closes when theairplane is pressuried to keep the water in the bladder.

The door sill drain bladder holds a maximum of one gallon of rain water.

When the airplane pressure increases to two to five psid, the valve in thebottom of the door sill drain bladder closes to keep the rain water in thebladder during flight.

When the airplane pressure decreases to 0.25 psid, the valve opens and

lets the rain water drain overboard through the door sill drain fitting on thebottom of the airplane.


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DOOR SILL DRAIN BLADDER


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5. VACUUM WASTE SYSTEM.

Interfaces.The flush switch sends a signal to operate the vacuum blower.The signal goes through the waste drain ball valve and the barometric switch.The waste drain ball valve must be closed.The barometric switch disables the vacuum blower when the airplane is above16,000 ft.

The FCU must receive an enable signal from the logic control module (LCM) tooperate the toilet assembly components.The LCM disables the FCU if the waste tank is full.

Training Information Point.The waste tank must be rinsed at every service interval.If the waste tank is not serviced properly, unwanted waste material can collecton the point level sensors.The collection of material on the point level sensors can cause a tank fullsignal.This will stop operation of the lavatory toilets.

You should flush crushed ice down the toilets at regular intervals.This will help to prevent the collection of unwanted material in the vacuumtubing.

CAUTION : DO NOT USE ICE CUBES AS AN ALTERNATIVE TO THE CRUSHED

ICE. ICE CUBES CAN CAUSE DAMAGE TO THE POINT LEVELSENSORS IN THE WASTE TANK.

There are clean-out fittings in the vacuum tubing.You use these to clear a blockage from the tubing.

5.1. System Description.

Vacuum Toilet Assemblies.

Operation of the flush switch sends a signal to the flush control unit (FCU).The FCU opens the rinse valve to supply potable water to flush the toilet bowl.After 0.7 seconds, the FCU closes the rinse valve.

Each rinse cycle uses eight ounces of potable water.The FCU then opens the flush valve for four seconds to let the toilet wastedrain out of the toilet. The flush valve then closes.The anti-siphon valve prevents the vacuum waste system from siphoning fromthe potable water system.

Waste Tank Assembly

Differential pressure causes the toilet bowl contents to flow from the toilet tothe waste tank.The vacuum blower or ambient pressure pulls air out of the waste tankthrough a water separator.This causes the tank to have a lower pressure than the cabin pressure.

The waste tank collects the waste from all the lavatory toilet assemblies.

Servicing the waste tank is from the waste service panel.You attach the service hose and open the waste tank drain valve.When the tank is empty, you attach the rinse hose and supply water pressure.Water flows through two filters and two rinse noles.The rinse noles spray water around the inside of the tank to clean the insidecomponents.The chemical precharge is put in after the tank is fully drained, and flushed.


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VACUUM WASTE - MECHANICAL

difference de presion

se troouve dans l P48

horizontal stabilser

onctionne 0-16000 ft

fonctionne de 0 - 16000 Ft ne

Microswitch qui arretera le

Flush


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5.2. Waste QTY Indication.

The waste quantity indicator shows the level of waste in the waste tank.

Location.The waste quantity indicator is a part of the attendant panel at the aftattendant station.

Physical Description.

The waste quantity indicator is a part of the waste system module.The waste system module has these features :

- Waste quantity indicator,- CLEAN/CHECK SENSOR light,- LAVS INOP light and test switch.

Operation.The waste quantity indicator shows the waste quantity with a LED segmentdisplay.The LED segment display shows the waste quantity from E (empty) to F (full) in1/8-tank increments.

The CLEAN/CHECK SENSOR light comes on when the waste tank level isthree inches (7.6 cm) or more below the tank full level and one of theseconditions occur :

- A point level sensor is fouled (dirty)

- A point level sensor failed the system BIT test

- There is a sensor disagreement.

Asensor disagreement occurs

when one point level sensor sends a tank full

signal and the other point level sensor sends a tank not full or sensor

fouled signal.

The LAVS INOP lightcomes on w hen both point level sensors send a tankfull signal.

You can do the system BIT test when you push the LAVS INOP test switch. If allcomponents pass the system BIT test, the waste quantity indicator shows a full

tank and the CLEAN/ CHECK SENSOR light is off.

Training Information Point.The CLEAN/CHECK SENSOR light shows problems with the point level sensors.When the waste tank level is three inches (7.6 cm) or less from the waste tankfull level, the CLEAN/ CHECK SENSOR light is disabled and can not come on.The CLEAN/CHECK SENSOR light is disabled to prevent nuisance indicationswhen splashes from turbulence or airplane maneuvers could cause the light tocome on.The signal to disable the CLEAN/CHECK SENSOR light comes from thecontinuous level sensor, through the logic control module.


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WASTE QTY INDICATION


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5.3. Toilet Assembly.

General.There is a vacuum toilet assembly and flush switch in each lavatory.

To get access to the flush switch, you must first remove the flush switch cover(two fasteners).The sink facia panel is next.It has a euss fastener under the sink.

The collar assembly has a keyhole slot and retainer clips.You pull the collar assembly toward you and clear the keyhole slot.You can lift the collar up and out to clear the retainer clip brackets.

The toilet assembly is behind the toilet shroud.You must remove the components to get access to the flush switch first.Then remove the toilet shroud.It lifts out as a unit.

Flush Switch.The flush switch controls the vacuum waste system flush cycle.It sends a signal to the flush control unit (FCU,) on the toilet assembly.The FCU starts the sequence that operates these waste system components :

- Vacuum blower when the airplane altitude is below 16,000 ft,- Vacuum toilet rinse valve,- Vacuum toilet flush valve.

Vacuum Toilet Assembly.The rinse valve sends potable water to the rinse ring.When the toilet flushes, the FCU opens the valve for 0.7 seconds and releaseswater.The rinse ring rinses the toilet bowl.

The anti-siphon valve prevents water in the rinse ring, and the toilet bowl fromgoing into the potable water system.This valve makes an air gap between the bowl and the potable water supply

The flush valve keeps the flow path between the toilet bowl and the wasteline closed.The valve opens to let waste material move from the toilet bowl to the wastelines to the waste tank.The FCU controls the flush valve.

Training Information Point.If the flush valve fails in the open position, cabin pressure is lost through theopen valve.There is a manual shutoff valve handle that will close the flush valve.Pull the handle (below the toilet shroud) to close the valve.Push the handle to open the valve.

The flush control unit has a maintenance switch.Use this switch if you must keep the flush valve open during maintenance.Push the switch one time to open the flush valve.Push the switch again and hold it in for two seconds to operate the blower.The blower operates for ten seconds and then stops.Operate the toilet flush switch (not shown) to close the flush valve and returnthe toilet to normal operation.

The toilet bowl has a coating of non-stick material.Do not let toilet bowl cleaner fluid stay in the toilet bowl for a long period of

time.This can damage the surface.


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Lavatory Flush Cycle Operation.When you push the flush switch, the vacuum blower operates if the airplane

is below 16000 ft.

The vacuum blower operates for 15 seconds.A duty cycle inhibit prevents another input from the flush switch for the next15 seconds.

One second after you push the flush switch, the rinse valve opens.The rinse valve stays open for approximately 0.7 seconds.

Eight ounces of potable water goes into the toilet bowl in this time frame.

Two seconds after the flush cycle starts, the flush valve opens.The flush valve is open for four seconds.


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OPERATION


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5.4. Vacuum System - Component Locations.

- The waste tank is in the aft cargo compartment, left side of the airplane.You must remove cargo lining to get access to it.The waste tank has 60 gallons (227 liters) usable capacity.It is made of composite materials and has a stainless steel inner liner.

- The liquid separator is on top of the waste tank.

- The waste tank ball valve is below outboard, and forward of the waste tank.

- The vacuum check valve and vacuum blower are forward of the waste tank.They are behind the side wall panels in the aft cargo compartment.

- The waste drain valve assembly and the waste drain rinse fitting assembly areon the waste service panel.You can access them from below the floor.

- The waste tank rinse noles are on the top of the waste tank.The waste tank rinse filters are along the inboard side of the waste tank.


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AFT CARGO COMPARTMENT


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5.5. Waste Tank.

The waste tank collects waste material from the lavatory toilets.

The waste tank is in the aft cargo compartment, left side of the airplane.You must remove cargo lining to get access to it.

The waste tank has 60 gallons (227 liters) usable capacity.It is made of composite materials and has a stainless steel inner liner.

The waste tank has fittings for these components :

- Rinse nole (2),- Water separator,- Waste line inlet (2),- Drain,- Point level sensor (2).

Band straps at the forward and aft ends hold the waste tank to the airplanestructure.

Training Information Point.Do the procedure for waste system servicing before you work on the wastetank or components.

Liquid Separator.The liquid separator removes moisture and waste particles from the wastetank air.This prevents damage to the vacuum blower and the release of unwantedmaterial going overboard.

The vacuum blower pulls air out of the tank to an overboard port.The air goes through the bottom of the liquid separator.Filters in the liquid separator remove unwanted material before the air goes

through the port in the cap.

Training Information Point.Before you work on the liquid separator, isolate the waste tank electricalcomponents.Do the waste tank servicing.Do not add chemical precharge.

Use a general purpose cleaner detergent to clean the liquid separator.

Use food grade processing grease on the packing when you do the liquidseparator installation.


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LIQUID SEPARATORWASTE TANK


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5.6. Waste Tank Sensors.

A. Point Level SensorThe point level sensor gives a signal to the logic control module (LCM) whenthe waste tank is full.

The point level sensor is a capacitance type sensor.It has a sensor face and an electrical connector.

Functional Description.The LCM supplies 15V DC power to the point level sensors.The point level sensors supply these signals to the LCM :

• Tank not full (OV DC)• Tank full (15V DC)• Sensor fouled (1.83 H)• BIT test results.

When the waste tank level is below a point level sensor, the point level sensorsends a tank not full signal to the LCM.

When the waste tank level covers 50 % of the face of a point level sensor, thepoint level sensor sends a tank full signal to the LCM.

The point level sensors can tell the difference between the build-up of wastematerial on a point level sensor and a full tank.A point-level sensor sends a sensor fouled signal to the LCM when the build-

up is more than 1/8-inch (3-2 mm).If the build-up becomes more than 3/8-inch (9.5 mm), the point level sensorsends a tank full signal to the LCM.

When a system BIT input signal is received from the LCM, the point levelsensor starts BIT.If the point level sensor passes the BIT tests, a O.OV DC signal goes to theLCM. If the point level sensor fails the BIT tests, a 1.83 H signal goes to theLCM.

Training Information Point.The point level sensors sense changes in the level of the waste tank bychanges in capacitance.The waste tank must be grounded to the airplane structure for the point levelsensors to accurately sense the waste tank level changes.

When a point level sensor is fouled, a sensor fouled signal goes to the LCM.The sensor fouled signal causes these indications :

• Related SENSOR J1 or SENSOR J2 light on the LCM flashes• CLEAN/CHECK SENSOR light on the attendant panel comes on• Waste material on the sensor is greater than 3/8 inch.

The sensor fouled signal continues until one of these conditions occur :

• Waste material is no longer on the point level sensor surface• Level of waste in the tank covers the sensor(s).

If the SENSOR J1 or SENSOR J2 light continues to flash after a rinse, it may benecessary to remove the sensor to clean it.

CAUTION : USE EXTREME CARE TO AVOID DAMAGE TO THE FACE OF THEPOINT LEVEL SENSOR.SCRATCHES OR DAMAGE CAN CAUSE A FAILURE OF THE POINTLEVEL SENSOR.

Use a soft bristle brush and soap to clean the face of the point level sensor.

NOTE : The two point level sensor connectors are identical.Make sure that you connect the point level sensor connectors to thecorrect receptacle on the LCM.


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POINT LEVEL SENSORS

i on a 02 sensors H/S toute lesoiletteeront H/S

J3 /fonctionne en delta Pr

J1

J2

J3

lampe rouge

lampe verte


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B. Continuous Level Sensor.The continuous level sensor measures the level of waste material in the

waste tank.

The sensor module connects to the drain line at the forward lower end of thewaste tank.The remote diaphragm connects to the vacuum line at the forward upper endof the waste tank.

Functional Description.The continuous level sensor is a capacitance-type pressure sensor.The sensor has these parts :

- Remote diaphragm,- Sensor module,- Capillary tube.

The capillary tube connects the remote diaphragm to the sensor module.The sensor module connects to the logic control module (LCM).

The sensor module measures the liquid (head) pressure at the bottom of thewaste tank.The remote diaphragm

measures the pressure of the air in the waste tank

.The pressure transmits through the oil-filled capillary tube to the sensormodule. The sensor module finds the difference between the air pressure inthe waste tank and the liquid pressure in the drain line.

The sensor uses the difference to calculate the level of waste in the waste

tank.

The output signal goes to the LCM.

Auto Zero Adjustment.Y

ou must do the auto zero adjustment when one of these conditions

occur :- When you move or replace the continuous level sensor,

- When you move or replace the waste tank.

You use the LCM to do the auto ero adjustment.The auto ero adjustment calibrates the LCM for variations between theremote diaphragm and sensor module on the continuous level sensor.

To do the auto ero adjustment, you must make sure that the waste tank isfully drained.You must disconnect the point level sensors.Then you put the test switch in the TEST LAMPS position for more than 10seconds.

These lights will go off for three seconds to show that the test is complete :

- SENSOR J1- SENSOR J2- SENSOR J3- TANK FULL.

The POWER O N light will stay on.


NOTE : Make sure that you drain the waste tank fully before you do the autoero adjustment procedure.If you do not drain the waste tank fully, an error in the waste quantityindication can occur.Do not bend the capillary tube of the continuous level sensor to lessthan a 3-inch radius.Sharp bends can cause damage to the capillary tub


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CONTINUOUS LEVEL SENSOR

Drain Valve


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A sensor disagreement occurs when one point level sensor sends a tank fullsignal and the other point level sensor sends a tank not full or sensor fouledsignal.

System BIT.

When system power comes on, the LCM does a power-up BIT test.The power-up BIT test makes sure that these components operate correctly:

- Point level sensors

- Continuous level sensor

- LCM

You can do the power-up BIT test at anytime when you do one of these steps:

- Push the LAVS INOP test switch on the w aste system module

- Put the test switch on the LCM in the TEST SEN SORS position.

After the LCM completes the power-up BIT test, it starts a continuous monitorcycle.This monitor cycle makes sure that the point level sensor says the LCM arefunctional.The continuous level sensor does not do a test during the monitor cycle.

Waste QTY - Functional Description.

PowerThe 28V DC ground service bus supplies power to the waste tank quantityindication system.

Displays.The continuous level sensor sends waste level data to the logic control module(LCM).

The LCM sends a waste level signal to the waste system module.The waste quantity indicator shows the waste level in 1/8 tank intervals.The E(empty) LED will be on when the waste quantity indication system has

power.

The waste level signal also goes to the service panel waste quantity indicator.

This indicator shows the waste level in 1/8 tank intervals.

When both point level sensors send a full tank signal to the LCM, the LCMdoes these steps:

- Stops operation of the toilets- Sends a full tank signal to the waste system module

The full tank signal causes the LAVS INOP light to come on

The CLEAN/CHECK SENSOR light comes on when the waste tank level is threeinches (7.6cm) or more below the tank full level and one of these conditionsoccur:

- A point level sensor is fouled (dirty)- A point level sensor has failed the power-up BIT test or the continuousmonitoring test- There is a sensor disagreement


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5.7. Vacuum Blower & Filter .

The vacuum blower removes air from the waste tank.

The vacuum blower takes the air from the waste tank and blows it out of theairplane.This causes a low pressure one in the waste tank.When a flush valve opens, higher pressure cabin air pushes lavatory toilet,waste to the (low pressure) waste tank.

The filter removes particles from air used to cool the vacuum blower duringoperation.

The vacuum blower operates when you push the flush switch and the airplaneis below 16,000 feet.

Three thermal switches give overheat protection. The switches are wiredin series and operate at 132°C (270°F). If a switch operates, it stops motoroperation. The switches reset when the temperature decreases to less thantheir set point.

Training Information Point.The vacuum blower has two flexible coupling hoses that attach with clamps.Four fasteners on shock mounts and a jumper cable attach the blower to theshelf.

There are four packings that hold the filter to the vacuum blower.

You can clean the filter.Use an air source and blow the air through the filter in the opposite directionof the usual flow.

Vacuum Check Valve.

The vacuum check valve prevents the pull of air from the waste tank vent portby the vacuum blower.

Functional Description.The vacuum check valve is spring-loaded to the closed position.The check valve opens when there is sufficient differential pressure betweenthe waste tank and the vent port.

A flow direction arrow shows the correct installation orientation.

si j'ai des traces noir :

probleme du separator


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VACUUM BLOWER & FILTER

Air compressor


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5.8. Vacuum Blower Operation.

Transfer bus 1 supplies 115V AC three-phase power for vacuum bloweroperation.

The control power is 28V DC from bus 1.

Functional Description.The vacuum blower operates when the airplane is below 16,000 feet altitude

and these conditions are true :

- Waste drain ball valve is closed

- Waste tank is not full

- Lavatory flush switch operates .

The barometric pressure switch senses ambient pressure

.When the airplane is below 16,000 feet, the barometric pressure switch isclosed.

The waste drain ball valve proximity switch is closed when the waste drain

ball valve is closed.

If the tank is not full, the logic control module (LCM) sends an enable signal toeach flush control unit (FCU).Each lavatory flush switch sends a signal to the FCU.The operational logic in each FCU completes the circuit for the vacuum blowerto operate.

The barometric pressure switch stops operation of the vacuum blower whenthe airplane is above 16,000 feet.

Three thermal switches in the vacuum blower stop the motor operation if the

temperature in the vacuum blower is more than 132°C (270°F).The thermal switches reset when the vacuum blower temperature decreases toless than 132°C (270°F).


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VACUUM BLOWER - OPERATION

Srvicing Panel

Stop Flush


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Waste Service Panel.The waste service panel is in the aft, lower-left area of the fuselage.

These are the components in the waste service panel :

- Waste drain valve assembly,- Waste drain ball valve pull rod T-handle- Waste tank rinse fitting assembly.- Waste quantity indicator (some installations)

Two snap-latches hold the panel closed.

You can get access to the waste service panel components from inside the aftcargo compartment.The service panel components are forward and below the waste tank.

Functional Description.The waste drain valve assembly connects to the waste drain elbow.The waste tank rinse fitting assembly connects to the rinse hose.The control handle lets you open the waste drain ball valve.

To drain the waste tank, you open the waste drain ball valve.

The proximity switch on the waste drain ball valve stops operation of

the vacuum blower w hen the waste drain ball valve is open.

The waste quantity indicator (if installed) shows the quantity of waste in the

waste tank.

Vacuum Blower Barometric Switch.The vacuum blower barometric switch opens when it senses altitude

above 16,000 feet.

The open switch does not let the vacuum blower come on.

The vacuum blower barometric switch is in the jackscrewcompartment. You get access to it through the section 48 access andblowout door.

The barometric switch attaches to structure on the left side of the fuselage.

The barometric switch has an aneroid capsule and an electrical connector.

Functional Description.The capsule senses the ambient air pressure.As the pressure outside decreases, the capsule expands.When the capsule expands to a specific sie, it opens an internal switch.

Interfaces.The vacuum blower barometric switch is part of the control circuit for vacuumblower operation.


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5.9. Waste Drain Ball Valve.

The waste drain ball valve and pull rod control the flow of waste out of thewaste tank.

Functional Description.The Waste drain ball valve is a manually operated two position ball valve.It has these parts :

- Ball valve,- Actuator lever,- Proximity switch.

There is an electrical connection at the proximity switch.The pull rod has a uniball assembly at the waste service panel.

You pull the T-handle at the waste service panel to open the valve

.The T-handle transmits motion through the pull rod to the actuator lever.The actuator lever moves the ball valve into position.

The proximity switch stops the operation of the vacuum blower when thevalve is not closed.

Training Information Point.The valve connects to the drain lines with v-band clamps and gask-o-sealgaskets.

You must remove the waste drain heater blanket before you work on thewaste drain ball valve.

There is a clean-out line from the drain elbow to the blockage removal valve.


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5.10. Vacuum Waste Line Clean-out Fitting.

The vacuum waste line clean-out fitting lets you, clean a blockage betweenthe forward cargo compartment and the waste tank.

Location.The vacuum waste line clean-out fitting is in the forward cargo

compartment. Remove the cargo compartment ceiling lining to get access tothe vacuum waste line clean-out fitting.

Functional Description.When the vacuum waste line clean-out fitting is removed, you can put aplumbers snake or a kinetic air-ram equipment in the vacuum waste line toremove the blockage.


WARNING : MAKE SURE YOU ATTACH A DO-NOT-OPERATE TAG TO THETOILET FLUSH HANDLES FOR ALL TOILETS IN THE SYSTEM.IF YOU FLUSH THE TOILETS UPSTREAM OF THE BLOCKAGE,THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TOEQUIPMENT.


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VACUUM WASTE LINE CLEAN-OUT FITTING

enlever le bouchon pour deploquer les ordures


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5.11. Waste Tank Rinse System.

Waste Tank Rinse Filter.The waste tank rinse filter removes small particles from the rinse water thatgoes through it.This prevents the rinse noles from becoming clogged.You can remove and clean the rinse filter element when it becomes dirty.

Waste Tank Rinse Nozzle.

The waste tank rinse nozzle sprays rinse water at the point level sensors and

at the waste tank interior surface.

The waste tank rinse nole is a rotating sphere with small holes.

Functional Description.Rinse water goes into the inlet of the rinse nole at the pressure of the servicehose.The nole increases the water velocity through small diameter holes.As the water goes out of the holes, it causes the rinse nole to turn.The rinse water sprays the high velocity stream around the inside of the wastetank.The rinse nole stream flushes the point level sensors.

Drain Line Blockage Removal Valve.The waste tank drain line blockage removal valve permits rinse water to clear aclogged waste tank drain line.

The manual position handle lets you to put the valve in one of these twopositions :

- Normal,- Blockage removal.

The normal position lets rinse water flow to the rinse noles during wastesystem servicing.

The blockage removal position lets rinse water flow to the drain line elbowfitting.This is the section of drain line between the waste drain ball valve and thewaste drain valve assembly at the service panel.

Training Information Point.The blockage removal procedure requires you to use the rinse fitting.You supply rinse water with the blockage removal valve is in the blockageremoval position.This is to loosen a blockage in the waste drain line.


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WATER TANK RINSE SYSTEM

direction du levier le sens de l'eau(normal/inverser l'eau)


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5.12. Logic Control Module.

Purpose.The logic control module (LCM) does these functions :

- Stops operation of the vacuum toilet assemblies when the waste tank isfull,

- Sends the waste tank level signal to the attendant panel waste quantityindicator,

- BITE. Location.The logic control module is part of the waste system in the aft cargocompartment.The LCM attaches to the structure above and forward of the waste tank.

Physical Description.The LCM has four connections and a three-position switch.It has these five indicator lights :

- SENSOR J1,- SENSOR J2,- SENSOR J3,- TANK FULL,- POWER ON.

The SENSOR J1 light & SENSOR J2 light give indication for the point level

sensors.The SENSOR J3 light gives indication for the continuous level sensor.The TANK FULL light shows the status of the waste tank and the LCM.

The PWR ON LED is green.The other LEDs are red.

Functional Description.The logic control module monitors the point level sensors and the continuouslevel sensor.

If both of the two point level sensors send tank full signals, the LCM stopsoperation of the vacuum toilet assemblies.It also sends a signal to the waste system module on the attendant panel forindication.

If the J1 or J2 sensor light flashes, it indicates a dirty (fouled) sensor.The LCM sends a signal to the waste system module for indication.

The continuous level sensor sends tank level data to the LCM.The LCM outputs a signal to the attendant panel waste quantity indicator.

LED Status.The four red LEDs show system status.System status updates every 250 milliseconds.

The are the conditions necessary for LED status :


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5.13. LCM - Details.

Two of the electrical connectors are for the point level sensors.One electrical connector is for the continuous level sensor.One electrical connector is for the power and signal connections to theairplane.

The test switch is a three-position (center off) momentary switch.In the UP position (TEST SENSORS), the LCM starts a power-up sequence

which includes a full system BIT test.In the DOWN position (TEST LAMPS), a test of the LEDs occurs.If the test switch is held down for more than 10 seconds and the point levelsensors are disconnected, an auto ero adjustment of the continuous levelsensor will occur.

The LCM sends a waste tank level signal to the waste tank quantityindicator on the attendant panel and the waste quantity gage (if installed). A tank full signal from the continuous level sensor does not affect toilet

operation.

The two point level sensors are level switches.When the level of the waste in the waste tank covers 50 of the face of a

point level sensor, the point level sensor sends a tank full signal to the

LCM. When both point level sensors send a tank full signal to the LCM, the

LCM stops the operation of the toilets.

The LCM uses a delay of 20 seconds on the point level sensor data before itstops the operation of the toilets. This delay makes sure that there is a stable

tank full signal and prevents the effects of momentary tank full signals due toairplane maneuvers or turbulence.

In normal circumstances,both point level sensors must send the tank full

signal to the LCM for the LCM to stop toilet operation .However, when one point level sensor has an error, the LCM uses a tank

full signal from the other point level sensor to stop toilet operation.

If both point level sensors have an error, the LCM will stop toilet operation

.

Lamp Test.You do a lamp test when you put the test switch in the TEST LAMPS position.During the lamp test, the four software-controlled LEDs on the LCM come on.The green POWER ON LED will be on when system power is on.

System BIT.When system power comes on, the LCM does a power-up BIT test.The power-up BIT test makes sure that these components operate correctly:

- Point level sensors.- Continuous level sensor.- LCM.

During the power-up BIT test, the LEDs flash momentarily and then come onfor three seconds. If all components pass the BIT test, all LEDs go off.If a component did not pass the BIT test, the related LED flashes at a two Hrate. The results of the BIT test for the LCM are reported by the TANK FULLLED.

To do the power-up BIT test, put the LCM test switch in the TEST SENSORSposition.

You can also do the power-up BIT test by a push of the test switch

on the attendant panel w aste quantity module.

After the LCM completes the power-up BIT test, it then starts a continuousmonitor cycle.This monitor cycle occurs every five milliseconds. The monitor cycle makes surethat the point level sensors and LCM are functional.

The continuous level sensor does not do a test during the monitoring cycle.

If the continuous level sensor fails after the power-up BIT test is complete,the failure will not be sensed.An erroneous signal from the continuous level sensor will not affect toiletoperation.You can detect errors in the continuous level sensor when you do the power-up BIT test.


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