38-WATER&WASTE

A319/A320/A321TECHNICAL TRAINING MANUAL

MECHANICS / ELECTRICS & AVIONICS COURSE

38 WATER & WASTE

This document must be used for training purpose only

Under no circumstances should this document be used as a reference.

It will not be updated.

All rights reserved.No part of this manual may be reproduced in any form,

by photostat, microfilm, retrieval system, or any other means,without the prior written permission of Airbus Industrie.

GENERAL** System Presentation (1) 1.......................

POTABLE WATER SYSTEM (A320)** Description/Operation (2) 5.....................** Controls and Indicating (1) 9...................** Components (3) 17................................

POTABLE WATER SYSTEM (A319)** Description/Operation (2) 33....................** Controls and Indicating (1) 39..................** Components (3) 47................................

POTABLE WATER SYSTEM (A321)** Description/Operation (2) 63....................** Controls and Indicating (1) 69..................** Components (3) 77................................

WASTE WATER SYSTEM** Description/Operation (3) 97....................** Components (3) 101...............................

TOILET SYSTEM** Principle (2) 107................................** Description (2) 111..............................** Controls and Indicating (1) 117.................** Monitoring (3) 123...............................** Components (3) 127...............................** Assembly Components (3) 141.....................

MAINTENANCE PRACTICES** Potable Water SYS Servicing (2) (A320) 149.....** Potable Water SYS Servicing (2)(A319/321) 153..** Toilet System Servicing (2) 157.................

_A319/A320/A321 TECHNICAL TRAINING MANUAL

38 WATER & WASTEMECHANICS / ELECTRICS & AVIONICS COURSE

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38 - WATER AND WASTE

38-00-00 WATER AND WASTE SYSTEMPRESENTATION

CONTENTS:Potable Water SystemWaste Water SystemToilet System

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WATER AND WASTE SYSTEM PRESENTATION

The water and waste system consists of a pneumaticallypressurized potable water system, a waste disposalsystem and a vacuum toilet system.

POTABLE WATER SYSTEM

The potable water system supplies the galleys andlavatories with water from a tank via a distributionsystem.It is pressurized by bleed air system. A groundconnector for external supply is also available.

WASTE WATER SYSTEM

The waste water system includes drainage of waste waterfrom lavatory wash basins and galley sinks, to bedischarged overboard via heated drain masts.

TOILET SYSTEM

The toilet system collects waste in an underfloor wasteholding tank. The tank is emptied and cleaned duringaircraft ground service.The toilet system uses water from the potable watersystem for the toilet flush. Waste is removed from thetoilet bowl due to differential pressure between thewaste tank and cabin.An electronic Vacuum System Controller (VSC) controlsand monitors the vacuum system.

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WATER AND WASTE SYSTEM PRESENTATION




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38 - WATER & WASTE SYSTEM

38-10-00 POTABLE WATER SYSTEM DESCRIPTION

CONTENTS:StoragePressurizationDistributionUser SupplyHeatingFillingDrainingSelf Examination

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POTABLE WATER SYSTEM DESCRITION

STORAGE

The potable water is stored in one tank installed inthe pressurized underfloor area of the right handfuselage, aft of the forward cargo compartment.Potable water tank capacity : 200 l (53 US gal).

PRESSURIZATION

Pressurization of the system enables water supply fromthe tank to the necessary service location.Compressed air is tapped from the cross feed line ofthe engine bleed air.On ground, when the bleed air system is not available,the ground air pressure supply system is used.If installed, an optional compressor ensurespressurization in case of bleed air decrease.

DISTRIBUTION

Potable water from the water tank is supplied througha system of distribution lines.The lavatory and galley distribution lines run belowthe passenger compartment floor.They are shrouded and insulated, and some of them areheated.

USER SUPPLY

Each lavatory can be isolated from the potable waterdistribution system through a manual shut-off valve.

HEATING

A water heater is installed under the wash basin insidethe sanitary unit cabinet.A thermostat allows the water temperature to bemaintained between 45 C (113 F) and 48 C (118,4 F).An over temperature safety device protects the heatingelement.

FILLING

Filling is achieved through a fill/drain valve operatedby the fill/drain control handle on the potable waterservice panel.The fill/drain control handle simultaneously opens theelectrically motorized overflow valve for venting.The quantity tramsmitter sends a tank-full signal toclose the fill/drain valve automatically.Manual operation is possible via control handlesdedicated to each valve.Maximum permissible pressure to fill the potable watertank is 50 psi (3.4 bars).

DRAINING

The draining operation is achieved through thefill/drain valve and two motorized drain valves usingthe same control handle as the filling operation.In this case, the overflow valve is also controlledto open.Manual operation is possible via control handlesdedicated to each valve.

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POTABLE WATER SYSTEM DESCRIPTION

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SELF EXAMINATION

Why is the potable water tank pressurized ?A-To ease draining operation.B - To warm up the waterC - To enable water supply from the tank to

the service users.

How many valves are used during draining operation ?A-Two.B-Three.C-Four.

What is used for tank filling operation ?A-One handle, one filling valve.B-One handle, two valves.C-Two handles, two valves.

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38-10-00 POTABLE WATER SYSTEM CONTROLSAND INDICATING

CONTENTS:GeneralPotable Water Service PanelForward Water Drain PanelsForward Attendant PanelSelf Examination

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POTABLE WATER SYSTEM CONTROLS AND INDICATING

GENERAL

The potable water controls and indicating includes thedisplay on the Forward Attendant Panel (FAP) and threepanels located at the bottom of the aircraft fuselage.

POTABLE WATER SERVICE PANEL

The potable water service panel is installed in therear left side of the fuselage.

DOOR MICROSWITCHThe door microswitch isolates the indicating systemwhen the potable water service panel is closed.When the door is open, the electric motor of thecompressor is stopped.

QUANTITY INDICATORThe quantity indicator gives the level of the waterin the potable water tank.

FILL/DRAIN CONTROL HANDLEThe fill/drain control handle is used to select afilling or draining operation.

FORWARD DRAIN VALVE OPEN LIGHTThe forward drain valve open light comes on when theforward drain valve is open.The light has a filament press to test facility.

TANK FULL LIGHTThe tank full light comes on when the water tank isfull.The light has a filament press to test facility.

TANK DRAIN VALVE LIGHTThe tank drain valve light comes on when the tank drainvalve is open.The light has a filament press to test facility.

OVERFLOW VALVE LIGHTThe overflow valve light comes on when the overflowvalve is open.The light has a filament press to test facility.

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POTABLE WATER SYSTEM CONTROLS AND INDICATING - POTABLE WATER SERVICE PANEL

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FORWARD WATER DRAIN PANELS

The Forward Water Drain Panels are located in the lowerpart of the forward fuselage.

DRAIN CONTROL HANDLESThe drain control handles are used for manuallyoperating of the forward drain valve.

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POTABLE WATER SYSTEM CONTROLS AND INDICATING - FORWARD WATER DRAIN PANELS




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FORWARD ATTENDANT PANEL

The Forward Attendant Panel (FAP) is located in theforward section of the cabin.

WATER QUANTITYThe Forward Attendant Panel displays the potable "WATerQuantiTY" stored in the potable water tank when the"IND ON" pushbutton is pressed in.The water quantity is also displayed when the potablewater service door is open.

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POTABLE WATER SYSTEM CONTROLS AND INDICATING - FORWARD ATTENDANT PANEL




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SELF EXAMINATION

How many potable water service and drain panels arefitted on the aircraft ?

A - One.B - Two.C - Three.

Where is the fill and drain valve port located ?A - On the potable water service panel.B - On the forward water drain panel.C - On both.

How many potable water quantity indicators arethere ?


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38-10-00 POTABLE WATER SYSTEM - COMPONENTS

CONTENTS:Water TankQuantity TransmitterWater Service Panel Door SwitchQuantity IndicatorControl HandleFill/Drain ValveForward Drain ValveWater HeaterManual Shut-Off ValveShuttle ValveAir FilterCheck ValvePressure Reducing/Relief Valve

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POTABLE WATER SYSTEM - COMPONENTS

WATER TANK

IDENTIFICATIONFIN: 3000MM

LOCATIONZONE: 138

DESCRIPTIONIt is made of Glass Fiber Reinforced Plastic (GFRP).It is strengthened to accept the rated pressure forthe potable water system (between 25 psi and 28 psi).The tank is attached to the aircraft structure withclamps and has a capacity: 200 l (53 US gal).The tank has:

- an overflow port,- an installation port for the quantitytransmitter,

- a connection for distribution,- a connection for air pressurization.

QUANTITY TRANSMITTER

IDENTIFICATIONFIN: 3MA

LOCATIONZONE: 138

DESCRIPTIONThe Quantity transmitter is installed in the watertank and monitors the volume of water remaining in thetank. It operates as a variable capacitor.The transmitter also has a low-level switch and high-level switch.The low-level switch opens when the water level dropsto a set level to disconnect electrical supply to thewater heaters in the lavatories.The high-level switch de-energizes a relay which closesthe fill/drain valve when the tank is full.

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POTABLE WATER SYSTEM - COMPONENTS - WATER TANK - QUANTITY TRANSMITTER




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WATER SERVICE PANEL DOOR SWITCH


LOCATIONZONE: 171

DESCRIPTIONThe microswitch closes to energize the indicatingsystem when the potable water service panel is openedfor ground servicing.The microswitch isolates the indicating system whenthe service door is closed again. The "IND ON"pushbutton, on the Forward Attendant Panel, overridesthe microswitch when pushed in.

QUANTITY INDICATOR


LOCATIONZONE: 171

DESCRIPTIONThe quantity indicator is supplied with the quantitytransmitter output signals. These signals move apointer over a scale calibrated in increments ofvolume.

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POTABLE WATER SYSTEM - COMPONENTS - DOOR SWITCH - QUANTITY INDICATOR

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CONTROL HANDLE


LOCATIONZONE: 171

DESCRIPTIONWhen you pull the control handle out and select it to"FILL" or "DRAIN" position, the fill drain valve opens.During filling operation, when the tank is full, thecontrol handle has to be manually put back to the"NORMAL" position.

FILL/DRAIN VALVE


LOCATIONZONE: 171

DESCRIPTIONThe fill/drain valve is installed between the waterservice panel and the potable water tank. Tubeassemblies connect the valve to the tank and to theports on the potable water service panel. The "FILL"function of the valve also operates as a "DRAIN"facility. Fill and drain facilities are manuallyselected on the service panel. The fill/drain valvedrains the rear section of the potable waterdistribution system (tank included).

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POTABLE WATER SYSTEM - COMPONENTS - CONTROL HANLDE - FILL/DRAIN VALVE

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FORWARD DRAIN VALVE

IDENTIFICATIONFIN: 4MP

LOCATIONZONE: 133

DESCRIPTIONThe forward drain valve drains the forward section ofthe potable water distribution system.When electrical power is available, the forward drainvalve is electrically controlled by operating thefill/drain valve handle.Without electrical power, the forward drain valve ismechanically controlled by operating the forward drainvalve handle.

WATER HEATER

LOCATIONZONE: Typical lavatory

DESCRIPTIONA water heater is installed under the wash basin insidethe sanitary unit cabinet. The potable water supplyline is connected to the heater inlet and the heateroutlet is connected to the water faucet.Capacity: 1.5 l (0.4 US gal).Temperature range: 45C to 48C (113F to 118F).Working pressure: 22 to 25 psi.An overtemperature safety device cuts off theelectrical power to the heating element when the watertemperature is above 60 5C (140 9F).This safety device can be reset with the resetpushbutton (under the cover).

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POTABLE WATER SYSTEM - COMPONENTS - FORWARD DRAIN VALVE - WATER HEATER

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MANUAL SHUT-OFF VALVE


DESCRIPTIONWhen the manual shut-off valve is closed, it isolatesthe lavatory from the potable water distribution systemand from the toilet. The shut-off valve is locatedunder the toilet shroud.

NOTE: Wet galleys are equipped with their own shut-offvalves.

SHUTTLE VALVE


LOCATIONZONE: 137

DESCRIPTIONThe shuttle valve directs the pressurized air.It allows the water tank to be pressurized either fromthe bleed air crossfeed line or the ground pressureconnection.

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POTABLE WATER SYSTEM - COMPONENTS - MANUAL SHUT-OFF VALVE - SHUTTLE VALVE

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AIR FILTER


LOCATIONZONE: 137

DESCRIPTIONThe air filter removes all unwanted materials whichare in the compressed air.

CHECK VALVE


LOCATIONZONE: 137

DESCRIPTIONThe check valve is installed between the pressurereducing/relief valve and the air filter. It makessure that the compressed air flows only in thedirection of the potable water tank.

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POTABLE WATER SYSTEM - COMPONENTS - FILTER - CHECK VALVE

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PRESSURE REDUCING/RELIEF VALVE


LOCATIONZONE: 137

DESCRIPTIONThe pressure reducing/relief valve reduces the airpressure to the system working pressure 25 psi (1.75bar) to 28 psi (1.93 bar).Above 32 psi (2.21 bar), it operates as a relief valveto protect the water tank.

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POTABLE WATER SYSTEM - COMPONENTS - PRESSURE REDUCING/RELIEF VALVE

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38-10-00 POTABLE WATER SYSTEMDESCRIPTION/OPERATION

Contents:StoragePressurizationDistributionHeatingIndicationServicingSelf Examination

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POTABLE WATER SYSTEM DESCRIPTION/OPERATION

STORAGE

The potable water tank with a capacity of 200 l. (53US gallons) is installed in the pressurized underfloorarea LH behind the rear cargo compartment.

PRESSURIZATION

Compressed air is used to pressurize the system inorder to supply water from the tank to the necessaryservice locations. The compressed air is tapped fromthe cross feed-line of the engine bleed air and isconnected to the water tank air inlet.

DISTRIBUTION

Potable water from the water tank is supplied througha system of distribution lines which are routed belowthe passenger compartment floor. A part of the forwarddistribution line goes through a hose for addedprotection. The potable water distribution lines areinsulated and electrically heated to prevent iceformation in and around the lines.

HEATING

In each lavatory, a water heater is installed underthe wash basin. If the quantity transmitter detects alow level into the water tank, it cuts the electricalsupply of the water heater.A thermostat maintains the water temperature between45C (113F) and 48C (149F). An over temperaturesafety device protects the heating element.

INDICATION

The quantity indication system indicates how much wateris available in the potable water tank. The quantitytransmitter transmits the signal to the indicator onthe water service panel and to the Forward AttendantPanel. The TANK FULL light on the service panel comeson when the tank is full.

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SERVICING

Servicing of the potable water system can be done withor without electrical power. With electrical power, the single FILL/DRAIN handlemechanically operates the fill/overflow drain valveand electrically controls the forward drain valve. Without electrical power, the valves are individuallyoperated by cables.The draining operation is accomplished by opening thefill/overflow drain valve and the forward drain valve.The filling operation is accomplished by opening thefill/overflow drain valve and closing the forward drainvalve.When the tank is full, the quantity transmitter sendsa signal to close the fill/overflow drain valveautomatically.

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SELF EXAMINATION

Why is the potable water tank pressurized ?A - To ease the draining operation.B - To warm up the waterC - To enable water supply from the tank to

the service users.

How many valves are used during the draining operation ?


Where can the potable water quantity be checked ?A - On the indicator on the water service

panel only.B - On the FAP only.C - On the indicator on the water service

panel and on the FAP.

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CONTENTS:GeneralPotable Water Service PanelForward Water Drain PanelForward Attendant PanelSelf Examination

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GENERAL

The potable water controls and indicating includes thedisplay on the Forward Attendant Panel (FAP) and twopanels located at the bottom of the aircraft fuselage.



DOOR MICROSWITCHThe door microswitch isolates the indicating systemwhen the potable water service panel is closed.


FILL/DRAIN CONTROL HANDLEThe fill/drain control handle is used to control theopening or closure of the fill/overflow drain valveand the forward drain valve for filling/drainingoperations.


TANK FULL LIGHTThe tank full light comes on when the water tank isfull.The light has a filament press to test facility.T M

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FORWARD WATER DRAIN PANEL

The Forward Water Drain Panel is located on the forwardleft side lower fuselage.

DRAIN CONTROL HANDLEThe drain control handle is used for manual operationof the forward drain valve.

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POTABLE WATER SYSTEM CONTROLS AND INDICATING - FORWARD WATER DRAIN PANEL




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SELF EXAMINATION



Where is the fill and drain valve port located ?A - On the potable water service panel.B - On the forward water drain panel.C - On both.



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38-10-00 POTABLE WATER SYSTEM COMPONENTS

CONTENTS:Water TankQuantity TransmitterWater Service Panel Door SwitchQuantity IndicatorControl HandleFill/Overflow Drain ValveForward Drain ValveWater HeaterManual Shut-off ValveShuttle ValveAir FilterCheck ValvePressure Reducing/Relief Valve

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POTABLE WATER SYSTEM COMPONENTS

WATER TANK

IDENTIFICATIONFIN : 3000MM

LOCATIONZONE : 171

DESCRIPTIONIt is made of Glass Fiber Reinforced Plastic (GFRP).It is strengthened to accept the rated pressure forthe potable water system (between 25 psi and 28 psi).The tank is attached to the aircraft structure withclamps and has a capacity : 200 l (53 US gal).The tank has:

- an overflow port- an installation port for thefill/overflow/drain valve

- an installation port for the quantitytransmitter

- a connection for distribution- a connection for air pressurization


IDENTIFICATIONFIN : 3MA

LOCATIONZONE : 171

DESCRIPTIONThe Quantity transmitter is installed in the watertank and monitors the volume of water in the tank. Itoperates as a variable capacitor.The transmitter also has a low-level switch and high-level switch.The low-level switch opens when the water level dropsto a set level to disconnect electrical supply to thewater heaters in the lavatories.The high-level switch de-energizes a relay which closesthe fill/overflow/drain valve when the tank is full.

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POTABLE WATER SYSTEM COMPONENTS - WATER TANK - QUANTITY TRANSMITTER

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LOCATIONZONE : 171

DESCRIPTIONThe microswitch closes to energize the indicatingsystem when the potable water service panel is openedfor ground servicing.The microswitch isolates the indicating system whenthe service door is closed again. The "IND ON"pushbutton, on the Forward Attendant Panel, overridesthe microswitch when pushed in.

QUANTITY INDICATOR


LOCATIONZONE : 171

DESCRIPTIONThe quantity indicator is supplied with the quantitytransmitter output signals. These signals move apointer over a scale calibrated in increments ofvolume.

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POTABLE WATER SYSTEM COMPONENTS - DOOR SWITCH - QUANTITY INDICATOR

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CONTROL HANDLE


LOCATIONZONE : 171

DESCRIPTIONWhen you pull the control handle out and select it to"FILL" or "DRAIN" position, the fill/overflow drainvalve opens.During filling operation, when the tank is full, thecontrol handle comes back automatically to the "NORMAL"position.

FILL/OVERFLOW DRAIN VALVE


LOCATIONZONE : 171

DESCRIPTIONThe fill/overflow drain valve is installed between thewater service panel and the potable water tank. Tubeassemblies connect the valve to the tank and to theports on the potable water service panel. The fillfunction of the valve also operates as a drainfacility. Fill and drain facilities are manuallyselected on the service panel. The overflow functionoperates as an overflow outlet and a vent for the tank.The fill/overflow drain valve drains the rear sectionof the potable water distribution system (tankincluded).

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POTABLE WATER SYSTEM COMPONENTS - CONTROL HANLDE - FILL/OVERFLOW DRAIN VALVE

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FORWARD DRAIN VALVE

IDENTIFICATIONFIN : 4MP

LOCATIONZONE : 133

DESCRIPTIONThe forward drain valve drains the forward section ofthe potable water distribution system.When electrical power is available, the forward drainvalve is electrically controlled by operating thefill/overflow drain valve handle.Without electrical power, the forward drain valve ismechanically controlled by operating by the forwarddrain valve handle.

WATER HEATER

LOCATIONZONE : Typical lavatory

DESCRIPTIONA water heater is installed under the wash basin insidethe sanitary unit cabinet. The potable water supplyline is connected to the heater inlet and the heateroutlet is connected to the water faucet.Capacity : 1.5 l (0.4 US gal).Temperature range : 45C to 48C (113F to 118F).Working pressure : 22 to 25 psi.An overtemperature safety device cuts off theelectrical power to the heating element when the watertemperature is above 60 5C (140 9F).This safety device can be reset with the resetpushbutton (under the cover).

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POTABLE WATER SYSTEM COMPONENTS - FORWARD DRAIN VALVE - WATER HEATER

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LOCATIONZONE : Typical lavatory

DESCRIPTIONWhen the manual shut-off valve is closed, it isolatesthe lavatory from the potable water distribution systemand from the toilet. The shut-off valve is locatedunder the toilet shroud.

NOTE :Wet galleys are equipped with their own shut-offvalves.

SHUTTLE VALVE


LOCATIONZONE : 171

DESCRIPTIONThe shuttle valve directs the pressurized air.It allows the water tank to be pressurized either fromthe bleed air crossfeed line or the ground pressureconnection.

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FILTER


LOCATIONZONE : 171

DESCRIPTIONThe air filter removes all unwanted materials whichare in the compressed air.

CHECK VALVE


LOCATIONZONE : 171

DESCRIPTIONThe check valve is installed between the pressurereducing/relief valve and the air filter. It makessure that the compressed air flows only in thedirection of the potable water tank.

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LOCATIONZONE : 171

DESCRIPTIONThe pressure reducing/relief valve reduces the airpressure from between 41 psi (2.83 bar) and 47 psi(3.24 bar) to the system working pressure 25 psi (1.75bar) to 28 psi (1.93 bar).Above 32 psi (2.21 bar), it operates as a relief valveto protect the water tank.

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POTABLE WATER SYSTEM COMPONENTS - PRESSURE REDUCUNG/RELIEF VALVE -

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THIS PAGE INTENTIONNALY LEFT BLANK.

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38-10-00 POTABLE WATER SYSTEMDESCRIPTION/OPERATION

Contents:StoragePressurizationDistributionHeatingIndicationServicingSelf Examination

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STORAGE

The potable water tank with a capacity of 200 l. (53US gallons) is installed in the pressurized underfloorarea LH behind the rear cargo compartment.

PRESSURIZATION

Compressed air is used to pressurize the system inorder to supply water from the tank to the necessaryservice locations. The compressed air is tapped fromthe cross feed-line of the engine bleed air and isconnected to the water tank air inlet. On ground, when the bleed air system is not available,the ground air pressure supply system is used.If installed, an optional compressor ensurespressurization in case of bleed air decrease.

DISTRIBUTION

Potable water from the water tank is supplied througha system of distribution lines which are routed belowthe passenger compartment floor. A part of the forwarddistribution line goes through a hose for addedprotection. The potable water distribution lines areinsulated and electrically heated to prevent iceformation in and around the lines.

HEATING

In each lavatory, a water heater is installed underthe wash basin. If the quantity transmitter detects alow level into the water tank, it cuts the electricalsupply of the water heater.A thermostat maintains the water temperature between45C (113F) and 48C (149F). An over temperaturesafety device protects the heating element.

INDICATION

The quantity indication system indicates how much wateris available in the potable water tank. The quantitytransmitter transmits the signal to the indicator onthe water service panel and to the Forward AttendantPanel. The TANK FULL light on the service panel comeson when the tank is full.

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SERVICING

Servicing of the potable water system can be done withor without electrical power. With electrical power, the single FILL/DRAIN handlemechanically operates the fill/overflow drain valveand electrically controls the forward drain valve. Without electrical power, the valves are individuallyoperated by cables.The draining operation is accomplished by opening thefill/overflow drain valve and the forward drain valve.The filling operation is accomplished by opening thefill/overflow drain valve and closing the forward drainvalve.When the tank is full, the quantity transmitter sendsa signal to close the fill/overflow drain valveautomatically.

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SELF EXAMINATION

Why is the potable water tank pressurized ?A - To ease the draining operation.B - To warm up the waterC - To enable water supply from the tank to

the service users.

How many valves are used during the draining operation ?


Where can the potable water quantity be checked ?A - On the indicator on the water service

panel only.B - On the FAP only.C - On the indicator on the water service

panel and on the FAP.

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CONTENTS:GeneralPotable Water Service PanelForward Water Drain PanelForward Attendant PanelSelf Examination

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GENERAL

The potable water controls and indicating includes thedisplay on the Forward Attendant Panel (FAP) and twopanels located at the bottom of the aircraft fuselage.



DOOR MICROSWITCHThe door microswitch isolates the indicating systemwhen the potable water service panel is closed.When the door is open, the electric motor of thecompressor is stopped.


FILL/DRAIN CONTROL HANDLEThe fill/drain control handle is used to fill or drainwater tank during filling or draining operations.


TANK FULL LIGHTThe tank full light comes on when the water tank isfull.The light has a filament press to test facility.T M

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FORWARD WATER DRAIN PANEL

The Forward Water Drain Panel is located in the forwardleft side lower fuselage.

DRAIN CONTROL HANDLEThe drain control handle is used for manually operatingof the forward drain valve.

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POTABLE WATER SYSTEM CONTROLS AND INDICATING - FORWARD WATER DRAIN PANEL




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SELF EXAMINATION



Where is the fill and drain valve located ?A - On the potable water service panel.B - On the forward water drain panel.C - On both.



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38-10-00 POTABLE WATER SYSTEM - COMPONENTS

CONTENTS:Water TankQuantity TransmitterWater Service Panel Door SwitchQuantity IndicatorControl HandleFill/Overflow Drain ValveForward Drain ValveWater HeaterManual Shut-off ValveShuttle ValveAir FilterCheck ValvePressure Reducing/Relief ValveCompressorCheck ValveAir FilterPressure Switch

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WATER TANK


LOCATIONZONE: 171

COMPONENT DESCRIPTIONIt is made of Glass Fiber Reinforced Plastic (GFRP).It is strengthened to accept the rated pressure forthe potable water system (between 25 psi and 28 psi).The tank is attached to the aircraft structure withclamps and has a capacity: 200 l (53 US gal).The tank has:

- an overflow port,- an installation port for thefill/overflow/drain valve,

- an installation port for the quantitytransmitter,

- a connection for distribution,- a connection for air pressurization.



LOCATIONZONE: 171

COMPONENT DESCRIPTIONThe quantity transmitter is installed in the watertank and monitors the volume of water remaining in thetank. It operates as a variable capacitor.The transmitter also has a low-level switch and high-level switch.The low-level switch opens when the water level dropsto a set level to disconnect electrical supply to thewater heaters in the lavatories.The high-level switch de-energizes a relay which closesthe fill/overflow/drain valve when the tank is full.

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POTABLE WATER SYSTEM - COMPONENTS - WATER TANK - QUANTITY TRANSMITTER

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LOCATIONZONE: 171

COMPONENT DESCRIPTIONThe microswitch closes to energize the indicatingsystem when the potable water service panel is openedfor ground servicing.The microswitch isolates the indicating system whenthe service door is closed again. The "IND ON"pushbutton, on the Forward Attendant Panel, overridesthe microswitch when pushed in.

QUANTITY INDICATOR


LOCATIONZONE: 171

COMPONENT DESCRIPTIONThe quantity indicator is supplied with the quantitytransmitter output signals. These signals move apointer over a scale calibrated in increments ofvolume.

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POTABLE WATER SYSTEM - COMPONENTS - DOOR SWITCH - QUANTITY INDICATOR

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CONTROL HANDLE


LOCATIONZONE: 171

COMPONENT DESCRIPTIONWhen you pull the control handle out and set it to"FILL" or "DRAIN" position, the fill/overflow drainvalve opens.During filling operation, when the tank is full, thecontrol handle comes back automatically to the "NORMAL"position.

FILL/OVERFLOW DRAIN VALVE


LOCATIONZONE: 171

COMPONENT DESCRIPTIONThe fill/overflow drain valve is installed between thewater service panel and the potable water tank. Tubeassemblies connect the valve to the tank and to theports on the potable water service panel. The "FILL"function of the valve also operates as a "DRAIN"facility. Fill and drain facilities are manuallyselected on the service panel. The overflow functionoperates as an overflow outlet and a vent for the tank.The fill/overflow drain valve drains the rear sectionof the potable water distribution system (tankincluded).

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POTABLE WATER SYSTEM - COMPONENTS - CONTROL HANLDE - FILL/OVERFLOW DRAIN VALVE

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FORWARD DRAIN VALVE

IDENTIFICATIONFIN: 4MP

LOCATIONZONE: 133

COMPONENT DESCRIPTIONThe forward drain valve drains the forward section ofthe potable water distribution system.When electrical power is available, the forward drainvalve is electrically controlled by operating thefill/overflow drain valve handle.Without electrical power, the forward drain valve ismechanically controlled by operating by the forwarddrain valve handle.

WATER HEATER

IDENTIFICATIONFIN:


COMPONENT DESCRIPTIONA water heater is installed under the wash basin insidethe sanitary unit cabinet. The potable water supplyline is connected to the heater inlet and the heateroutlet is connected to the water faucet.Capacity: 1.5 l (0.4 US gal).Temperature range: 45C to 48C (113F to 118F).Working pressure: 22 to 25 psi.An overtemperature safety device cuts off theelectrical power to the heating element when the watertemperature is above 60 5C (140 9F).This safety device can be reset with the resetpushbutton (under the cover).

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POTABLE WATER SYSTEM - COMPONENTS - FORWARD DRAIN VALVE - WATER HEATER

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IDENTIFICATIONFIN:


COMPONENT DESCRIPTIONWhen the manual shut-off valve is closed, it isolatesthe water faucet from the potable water distributionsystem and from the toilet. The shut-off valve islocated under the toilet shroud.

NOTE: Wet galleys are equipped with their own shut-offvalves.

SHUTTLE VALVE


LOCATIONZONE: 171

COMPONENT DESCRIPTIONThe shuttle valve directs the pressurized air.It allows the water tank to be pressurized either fromthe bleed air crossfeed line or the ground pressureconnection.

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AIR FILTER


LOCATIONZONE: 171

COMPONENT DESCRIPTIONThe air filter removes all unwanted materials whichare in the compressed air.

CHECK VALVE


LOCATIONZONE: 171

COMPONENT DESCRIPTIONThe check valve is installed between the pressurereducing/relief valve and the air filter. It makessure that the compressed air flows only in thedirection of the potable water tank.

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POTABLE WATER SYSTEM - COMPONENTS - AIR FILTER - CHECK VALVE

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LOCATIONZONE: 171

COMPONENT DESCRIPTIONThe pressure reducing/relief valve reduces the airpressure from between 41 psi (2.83 bar) and 47 psi(3.24 bar) to the system working pressure 25 psi (1.75bar) to 28 psi (1.93 bar).Above 32 psi (2.21 bar), it operates as a relief valveto protect the water tank.

COMPRESSOR

IDENTIFICATIONFIN: 8MD

LOCATIONZONE: 163

COMPONENT DESCRIPTIONThe compressor is a double-bellows reciprocating pumpthat is electrically driven. It has:

- an electric motor,- a housing,- a crankshaft,- bearings,- inlet and outlet valves,- two drive rods,- two bellows (which function as a double-pistonair compressor unit).

The electrical motor is fan cooled and has its ownhousing. The motor operates at 3600 rpm when it issupplied with 115 VAC 400Hz from the 3 phase currentof AC BUS 2. A thermal-overload protection circuitmomentarily stops the motor in case of overheat.The air compressor supplies approximately two cubicfeet of clean compressed air to the potable water tankat a pressure of 37 psi (2.55 bar). The pressure inthe tank is increased to 28 psi (1.93 bar).

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POTABLE WATER SYSTEM - COMPONENTS - PRESSURE REDUCUNG/RELIEF VALVE - COMPRESSOR

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CHECK VALVE


LOCATIONZONE: 163

COMPONENT DESCRIPTIONThe check valve makes sure that the compressed airflows only in the direction of the potable water tank.

AIR FILTER


LOCATIONZONE: 163

COMPONENT DESCRIPTIONThe air filter stops the ingress of impurities intothe system from the air around the compressor.

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POTABLE WATER SYSTEM - COMPONENTS - CHECK VALVE - AIR FILTER

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PRESSURE SWITCH

IDENTIFICATIONFIN: 10MD

LOCATIONZONE: 163

COMPONENT DESCRIPTIONThe pressure switch senses the pressure in the potablewater tank. It also switches the electric motor of thecompressor on and off. At 28 psi (1.93 bar), thepressure switch disconnects the 28 V DC line from therelay to stop the electric motor. When the pressurein the potable water tank is 25 psi (1.72 bar) thepressure switch connects the 28 V DC line to start theelectric motor to pressurize the system.

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38 - WATER/WASTE SYSTEM

38-32-00 WASTE WATER SYSTEMDESCRIPTION/OPERATION

CONTENTSGeneralDrain AssemblyDrain ValveDrain MastSelf Examination

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WASTE WATER SYSTEM DESCRIPTION/OPERATION

GENERAL

The waste water drain system disposes waste water fromthe lavatory wash basins and from the galley sinks.

DRAIN ASSEMBLY

Each lavatory wash basin has a drain assembly with avalve actuated by a control knob and a cable.

NOTE: The control knob is operated by the lavatoryuser.

DRAIN VALVE

Each drain valve opens only when a certain amount ofwater is collected.This prevents a permanent loss of cabin airpressurization through the drain lines.

DRAIN MAST

In flight, differential pressure between the cabin andthe drain mast outlet disgards the waste water.On ground, gravity disgards the waste water.The drain masts are electrically heated to prevent iceformation.

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WASTE WATER SYSTEM DESCRIPTION

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SELF EXAMINATION

Why are drain valves installed in the waste waterdrain system ?

A - To allow the sinks and wash basins to beisolated.

B - To prevent a permanent loss of cabin airpressurization.

C - To prevent wash basins from beingisolated.

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38-32-00 WASTE WATER SYSTEM COMPONENTS

CONTENTS:Galley & Lavatory Drain ValveLavatory Drain AssemblyDrain Mast

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WASTE WATER SYSTEM COMPONENTS

GALLEY & LAVATORY DRAIN VALVE

IDENTIFICATIONFIN:

LOCATIONZONE: Typical Wet Galley / Typical Lavatory

COMPONENT DESCRIPTIONOn ground, the drain valve is open. During flight, thevalve is held closed by pressurized cabin air. Thevalve opens when the waste water, which enters thevalve, has built up enough pressure to displace thediaphragm. This prevents leakage of cabin air throughthe drain line.The drain valve can be manually operated by liftingthe seal assembly using the pull ring.

LAVATORY DRAIN ASSEMBLY

IDENTIFICATIONFIN:

LOCATIONZONE: Typical Lavatory

COMPONENT DESCRIPTIONThe lavatory wash basins have a drain valve assemblyfor the drainage of the waste water. The wash basindrain valve has a connection for the drain line. Acontrol cable connects a poppet to a control knob onthe back of the sink. The knob can be turned to openor to close the valve.

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WASTE WATER SYSTEM COMPONENTS - GALLEY & LAVATORY DRAIN VALVE - LAVATORY DRAIN ASSEMBLY

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WASTE WATER SYSTEM COMPONENTS

DRAIN MAST

IDENTIFICATIONFIN: 4DU, 14DU

LOCATIONZONE: 133, 172

COMPONENT DESCRIPTION2 Drain masts are installed on the lower fuselage shellto discard waste water. Each drain mast has a draintube, an integrated electrical heating element and aflange for the installation of the drain mast.

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WASTE WATER SYSTEM COMPONENTS - DRAIN MAST

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38-31-00 VACUUM TOILET SYSTEM PRINCIPLE

CONTENTS:GeneralRinse/Flush ControlVacuum ControlSelf Examination

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EFFECTIVITY 38-31-00 Page 1Oct 31/99



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VACUUM TOILET SYSTEM PRINCIPLE

GENERAL

Potable water from the aircraft pressurized potablewater system is used to rinse the toilet bowl.Differential pressure between the cabin and theatmosphere moves the waste from the toilet bowl to thewaste holding tank.This difference of pressure can be caused by the vacuumgenerator or by aircraft pressurization.

RINSE/FLUSH CONTROL

A Flush Control Unit (FCU) per toilet controls therinse and flush cycle.

VACUUM CONTROL

As soon as a flush switch is pressed, electrical poweris supplied to the vacuum system controller.At high altitude, the altitude pressure switch stopsthe electrical supply of the vacuum generator, thedifferential pressure between the cabin and theatmosphere being sufficient to move the waste from thetoilet bowl to the waste holding tank.At low altitude or on ground, the altitude pressureswitch stays closed. The vacuum generator generatesthe necessary differential pressure.

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TOILET SYSTEM PRESENTATION

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SELF EXAMINATION

On ground, when does the vacuum generator startto operate?

A - As soon as the aircraft is energized.B - As soon as the flush switch is pressed

in, and only if the altitude pressureswitch is closed.

C - As soon as the altitude pressure switchcloses.

What happens when the flush switch is pressed athigh altitude?

A - As the differential pressure between thecabin and the atmosphere is sufficient,the vacuum generator does not operate.

B - As the differential pressure between thecabin and the atmosphere is notsufficient, the vacuum generator doesnot operate.

C - As the differential pressure between thecabin and the atmosphere is sufficient,the vacuum generator operates.

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EFFECTIVITY 38-31-00 Page 4O

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