Single Aisle 

 TECHNICAL TRAINING MANUAL 

 CMQ A330/A340 to A319/320/321 (IAE V2500/ME) T1 (Lvl
2&3) 
 WATER & WASTE 
 This document must be used for training purposes 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 S.A.S.
 Single Aisle TECHNICAL TRAINING MANUAL

WATER & WASTE

GENERAL
Water/Waste Level 2 (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
POTABLE WATER (A320)
Potable Water System D/O (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Potable Water System Controls & Indicating (2) . . . . . . . . . . . . . . . . 26
POTABLE WATER (A318/A319/A321)
Potable Water System D/O (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Potable Water System Controls & Indicating (2) . . . . . . . . . . . . . . . . 34
WASTE WATER
Waster Water System D/O (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
TOILET
Toilet System Principle (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Toilet System Description (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Toilet System Controls & Indicating (2) . . . . . . . . . . . . . . . . . . . . . . 48
Toilet System Monitoring (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
MAINTENANCE PRACTICE
Potable Water SYS Servicing (A320) (2) . . . . . . . . . . . . . . . . . . . . . . 54
Potable Water SYS Servicing (A318/319/321) (2) . . . . . . . . . . . . . . . 60
Toilet System Servicing (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
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WATER/WASTE LEVEL 2 (2)

SYSTEM OVERVIEW
The water and waste system consist of three subsystems:
- Potable water system
- Waste water system
- Toilet system
WATER AND WASTE FLUID STORAGE (A318 / A319 /
A321)
The potable water tank and the waste holding tank are installed in the
pressurized underfloor area LH rear the aft cargo compartment. An
indication system monitors the water and waste tank quantities.
POTABLE WATER SYSTEM
The potable water system supplies water from the water tank through
a distribution system to the user. The water is supplied to water faucets
in the galleys and lavatories. The system also supplies water to the
water heaters and vacuum toilet units. Mechanically or electrically
operated valves control the supply of the potable water system.
Compressed air is used to pressurize the system to supply water from
the tank to the necessary service locations. The air pressure is supplied
from the bleed air system in normal configuration or a ground pressure
connection for maintenance. An air compressor can be installed as an
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option. Each lavatory can be isolated from the potable water

distribution system through a manual shut-off valve.

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SYSTEM OVERVIEW - WATER AND WASTE FLUID STORAGE (A318 / A319 / A321) & POTABLE WATER SYSTEM

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WATER/WASTE LEVEL 2 (2)

SYSTEM OVERVIEW (continued)
WATER AND WASTE FLUID STORAGE (A320)
For the A320 only, the location of the potable water tank is aft of the
forward cargo compartment.
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SYSTEM OVERVIEW - WATER AND WASTE FLUID STORAGE (A320)

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WATER/WASTE LEVEL 2 (2)

SYSTEM OVERVIEW (continued)
POTABLE WATER HEATING, ICE PROTECTION AND
WINTERIZATION PROTECTION
One water heater is installed in each lavatory and in each galley. Water
pipes, where icing conditions can occur are insulated and heated by
tape electrical heaters. The potable water service panel is heated to
prevent ice formation. Optionally, the fill/drain nipple and overflow
nipple are also electrically heated. These heating elements are
controlled automatically by two anti-ice control units installed in the
cargo compartments. In winter conditions, the potable water system
must be drained during night stops.
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SYSTEM OVERVIEW - POTABLE WATER HEATING, ICE PROTECTION AND WINTERIZATION PROTECTION

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WATER/WASTE LEVEL 2 (2)

SYSTEM OVERVIEW (continued)
POTABLE WATER CONTROL AND INDICATING (FAP)
The water and waste indications are displayed on the Flight Attendant
Panel (FAP) for aircraft fitted with cabin systems. ON FAP, the
quantity indication is displayed automatically as soon as the service
panel is open, or when the Water/Waste key on the FAP is selected.
As an option, the filling quantity can be selected (25%, 50%, 75%
and 100%).
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SYSTEM OVERVIEW - POTABLE WATER CONTROL AND INDICATING (FAP)

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WATER/WASTE LEVEL 2 (2)

SYSTEM OVERVIEW (continued)
POTABLE WATER CONTROL AND INDICATING
(SERVICE PANEL)
There is only one control handle to fill or drain the water tank. It is
located on the water service panel. One drain valve is electrically
controlled when the fill/drain control handle is set to the drain position.
The overflow valve opens electrically when the fill/drain valve handle
is set to the drain or fill position. On the servicing panel, the indicator
gives the water quantity. One green light indicates that the forward
drain valve is open and one green light indicates that the tank is full.
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SYSTEM OVERVIEW - POTABLE WATER CONTROL AND INDICATING (SERVICE PANEL)

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WATER/WASTE LEVEL 2 (2)

SYSTEM OVERVIEW (continued)
WASTE WATER SYSTEM
The waste water system drains the used water from the lavatory
washbasins and the galley sinks. The waste water is discarded
overboard outside through the drain valve and the drain mast. The
two drain masts and drain lines have integrated electrical heating
elements to prevent ice formation at high altitude or during cold
weather.
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SYSTEM OVERVIEW - WASTE WATER SYSTEM

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WATER/WASTE LEVEL 2 (2)

SYSTEM OVERVIEW (continued) TOILET SYSTEM CONTROL AND INDICATING
The vacuum toilet system is connected to the CIDS. The CIDS controls
TOILET SYSTEM and monitors the system functions and the related electric components.
The toilet system gives sanitary facilities for the passengers and crews. A Flush Control Unit (FCU) per toilet controls the rinse and flush
The system is a vacuum type toilet system and uses potable water for cycle as soon as the flush SW is pressed. The system uses potable
flushing. water from the potable water system to rinse the toilet bowl. When
the waste holding tank is full, a signal is sent to the CIDS, which shuts
TOILET SYSTEM FLUSHING OPERATION
down the toilet systems. The FAP displays the waste tank quantity
The system uses potable water from the aircraft pressurized water stored in the waste holding tank when the Water/Waste key on the
system to flush the toilet. A vacuum drain valve removes waste from FAP is selected.
the toilet bowl to an under floor waste holding tank. At high altitude,
the differential pressure between the cabin and the atmospheres is
sufficient to move the waste from the toilet bowl into the waste holding
tank. At low altitude or on ground, a vacuum generator starts to give
the necessary differential pressure in the waste system to move the
waste from the bowl to the tank. The Vacuum System Controller
Function (VSCF), integrated in the Cabin Intercommunication Data
System (CIDS), controls the flushing system operation and stops the
operation when the waste servicing panel is open. When the tank is
full, the liquid level transmitter stops the system operation.
TOILET SYSTEM WASTE DISPOSAL
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The waste holding tank is installed on the right of the aircraft under
the floor behind the bulk cargo compartment. The tank includes a
water separator, a liquid level transmitter, a liquid level sensor, a waste
drain valve and two rinse line connections.
TOILET SYSTEM WASTE TANK HEATING
(OPTIONAL)
The waste holding tank can be insulated. The lines between the tank
and the service panel with the waste drain valve can be insulated and
heated.

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SYSTEM OVERVIEW - TOILET SYSTEM ... TOILET SYSTEM CONTROL AND INDICATING

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WATER/WASTE LEVEL 2 (2)

SERVICING
POTABLE WATER SERVICING
The potable water system supplies the galleys and toilets with water
from the tank via a distribution system. The tank is pressurized by air
either:
- From the pneumatic system,
- Or from a ground cart connected to the ground connector,
- Or optionally from a compressor.
On the A320 only, two valves are used for filling:
- The fill/drain valve, this is opened manually and closed electrically,
- The overflow valve, this is opened and closed electrically,
Four valves are used for draining:
- The fill/drain valve, this is opened and closed manually,
- The FWD drain valve, tank drain valve and overflow valve, these
are opened and closed electrically.

NOTE: On A320, if there is no electrical power all four valves can

be manually operated.
On A318, A319 and A321, one valve is used for filling:
- The overflow/fill/drain valve, this is opened manually and closed
electrically,
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Two valves are used for draining:

- The overflow/fill/drain valve, this is manually operated,
- The FWD drain valve, this is electrically operated.

NOTE: On A318, A319 and A321, if there is no electrical power

both valves must be manually operated.

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SERVICING - POTABLE WATER SERVICING

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WATER/WASTE LEVEL 2 (2)

SERVICING (continued)
TOILET SYSTEM SERVICING
Connect the toilet service vehicle to the toilet service panel.
Move the drain valve control-handle from the close to the open
position.
Drain the waste from the toilet tank.
Flush the toilet system.
Fill the toilet tank with 10 l of disinfectant solution.
Do not discharge products such as oil, fuel, solvent, lubricant either
in trash bins, soil or into the water network (drains, gutters, rain water,
waste water, etc...)
Sort waste fluids and use specific waste disposal containers.
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SERVICING - TOILET SYSTEM SERVICING

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WATER/WASTE LEVEL 2 (2)

MEL/DEACTIVATION
If the drain mast is not heated, the aircraft can be dispatched provided
that the associated galleys or toilets are not used (toilet door locked and
placarded "Inoperative'') and their water shut off valves are closed.
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MEL/DEACTIVATION

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WATER/WASTE LEVEL 2 (2)

MAINTENANCE TIPS
POTABLE WATER SYSTEM DRAINING IN COLD
WEATHER CONDITIONS
In cold weather conditions the potable water system must be drained
to prevent damage to the system by ice. To decide if the potable water
system needs be drained, we must refer to the water system drain
configuration table in the AMM 12-24-38. If the bleed air system is
off and the outside air temperature is below 0 °C (32 °F), the drain
valves must remain open after the potable water system is drained to
prevent damage to the potable water system. The cold weather
maintenance practices for the potable water system are given in the
AMM 12-31-38.
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MAINTENANCE TIPS - POTABLE WATER SYSTEM DRAINING IN COLD WEATHER CONDITIONS

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POTABLE WATER SYSTEM D/O (2)

(118,4 °F). An over temperature safety device protects the heating
STORAGE element.
The potable water is stored in one tank installed in the pressurized INDICATING
underfloor area of the right hand fuselage, aft of the forward cargo
compartment. The potable water tank has a capacity of 200 l (53 US gal). The quantity indication system indicates how much water is available in
the potable water tank. The quantity transmitter transmits the signal to
PRESSURIZATION the indicator on the water service panel and to the Forward Attendant
Panel (FAP). The TANK FULL light on the service panel comes on when
Pressurization of the system enables water supply from the tank to the
the tank is full.
necessary service location. Compressed air is tapped from the cross feed
line of the engine or APU bleed air. On ground, when the bleed air system FILLING
is not available, the ground air pressure supply system is used. If installed,
an optional compressor is used for the pressurization in case of bleed air The Filling is achieved through a fill/drain valve operated by the fill/drain
decrease. During servicing, the overflow valve lets the potable water tank control handle on the potable water service panel. The fill/drain control
depressurized. handle simultaneously opens the electrically motorized overflow valve
for venting. The quantity transmitter sends a tank-full signal to close the
DISTRIBUTION fill/drain valve automatically. Manual operation is possible via control
handles dedicated to each valve. Maximum permissible pressure to fill
Potable water from the water tank is supplied through a system of
the potable water tank is 50 psi (3.4 bars).
distribution lines. The lavatory and galley distribution lines run below
the passenger compartment floor. They are shrouded and insulated, and
CAUTION: WITHOUT ELECTRICAL POWER YOU MUST OPEN
some of them are electrically heated to prevent ice formation. Each
THE OVERFLOW VALVE MANUALLY PRIOR TO THE
lavatory and each galley have an individual and manual shutoff valve.
FILLING TO PREVENT WATER SPILLAGE IN THE
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USER SUPPLY CABIN.

Each lavatory can be isolated from the potable water distribution system DRAINING
through a manual Shut-Off Valve (SOV).
The draining operation is achieved through the fill/drain valve and two
HEATING motorized drain valves using the same control handle as the filling
operation. In this case, the overflow valve is also controlled to open.
A water heater is installed under the wash basin inside the sanitary unit Manual operation is possible via control handles dedicated to each valve.
cabinet. If the quantity transmitter detects a low level into the water tank,
it cuts the electrical supply of the water heater. A thermostat allows the
water temperature to be maintained between 45 °C (113 °F) and 48 °C

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STORAGE ... DRAINING

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POTABLE WATER SYSTEM CONTROLS & INDICATING (2)

GENERAL OVERFLOW VALVE LIGHT
The overflow valve light comes on when the overflow valve is open.
The potable water controls and indicating includes the display on the The light has a lamp press to test facility.
Forward Attendant Panel (FAP) and three panels located at the bottom
of the aircraft fuselage.

POTABLE WATER SERVICE PANEL

The potable water service panel is installed in the rear left hand side of
the fuselage.
DOOR MICROSWITCH
The door microswitch isolates the indicating system when the potable
water service panel is closed. When the door is open, the electric
motor of the compressor is stopped (if installed).
QUANTITY INDICATOR
The quantity indicator gives the level of the water in the potable water
tank.
FILL/DRAIN CONTROL HANDLE
The fill/drain control handle is used to select a filling or draining
operation.
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FORWARD DRAIN VALVE OPEN LIGHT

The forward drain valve open light comes on when the forward drain
valve is open. The light has a lamp press to test facility.
TANK FULL LIGHT
The tank full light comes on when the water tank is full. The light has
a lamp press to test facility.
TANK DRAIN VALVE LIGHT
The tank drain valve light comes on when the tank drain valve is open.
The light has a lamp press to test facility.
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GENERAL & POTABLE WATER SERVICE PANEL

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POTABLE WATER SYSTEM CONTROLS & INDICATING (2)

WATER DRAIN PANELS
The forward drain panel and the drain/overflow panel are located in the
lower part of the forward fuselage. The drain control handles are used to
manually operate the drain valves.
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WATER DRAIN PANELS

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POTABLE WATER SYSTEM CONTROLS & INDICATING (2)

FAP
The FAP is located in the forward section of the cabin. The FAP displays
the potable WATER QuantiTY stored in the potable water tank when the
INDication ON P/B is pressed. The WATER QTY is also displayed when
the potable water service door is open.
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FAP

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POTABLE WATER SYSTEM D/O (2)

STORAGE INDICATING
The potable water tank with a capacity of 200 l (53 US gal) is installed The quantity indication system indicates how much water is available in
in the pressurized LH under floor area behind the rear cargo compartment. the potable water tank. The quantity transmitter transmits the signal to
the indicator on the water service panel. It also sends the information to
PRESSURIZATION a Decoder/Encoder Unit (DEU) B, which in turn interfaces with the active
Cabin Intercommunication Data System (CIDS) director to display on
Compressed air is used to pressurize the system in order to supply water
the Flight Attendant Panel (FAP) the water tank contents in percentage
from the tank to the necessary service locations. The compressed air is
of volume. The TANK FULL light on the service panel comes on when
tapped from the cross feed-line of the engine or APU bleed air and is
the tank is full.
connected 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, SERVICING
an optional compressor is used for the pressurization in case of bleed air
decrease. The Servicing of the potable water system can be done with or without
electrical power. With electrical power, the single fill/drain control handle
DISTRIBUTION mechanically operates the fill/overflow drain valve and electrically
controls the forward drain valve. Without electrical power, the valves
Potable water from the water tank is supplied through a system of
are individually operated by cables. The draining operation is
distribution lines, which are routed below the passenger compartment
accomplished by opening the fill/overflow drain valve and the forward
floor. A part of the forward distribution line goes through a hose for added
drain valve. The filling operation is accomplished by opening the
protection. The potable water distribution lines are insulated and
fill/overflow drain valve and closing the forward drain valve. When the
electrically heated to prevent ice formation in and around the lines. Each
tank is full, the quantity transmitter sends a signal to close the fill/overflow
lavatory and each galley have an individual and manual shutoff valve.
drain valve automatically.
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HEATING
In each lavatory, a water heater is installed under the wash basin. If the
quantity transmitter detects a low level into the water tank, it cuts the
electrical supply of the water heater. A thermostat maintains the water
temperature between 45°C (113°F) and 51.7°C (125°F). An over
temperature safety device protects the heating element.

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STORAGE ... SERVICING

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POTABLE WATER SYSTEM CONTROLS & INDICATING (2)

GENERAL
The potable water controls and indicating includes the display on the
Flight Attendant Panel (FAP) and two panels located at the bottom of
the aircraft fuselage.

POTABLE WATER SERVICE PANEL

The potable water service panel is installed in the rear left hand side of
the fuselage.
DOOR MICROSWITCH
The door microswitch isolates the indicating system when the potable
water service panel is closed. When the door is open, the electric
motor of the compressor is stopped (if installed).
QUANTITY INDICATOR
The quantity indicator gives the level of the water in the potable water
tank.
FILL/DRAIN CONTROL HANDLE
The fill/drain control handle is used to select a filling or draining
operation.
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FORWARD DRAIN VALVE OPEN LIGHT

The forward drain valve open light comes on when the forward drain
valve is open. The light has a lamp press to test facility.
TANK FULL LIGHT
The tank full light comes on when the water tank is full. The light has
a press to test facility.

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GENERAL & POTABLE WATER SERVICE PANEL

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POTABLE WATER SYSTEM CONTROLS & INDICATING (2)

FORWARD WATER DRAIN PANEL
The forward water drain panel is located in the forward left hand side of
the lower fuselage. The drain control handle is used to manually operate
the forward drain valve.
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FORWARD WATER DRAIN PANEL

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POTABLE WATER SYSTEM CONTROLS & INDICATING (2)

FAP
The FAP is located in the forward section of the cabin. The FAP displays
the potable WATER QUANTITY stored in the potable water tank when
the Water/Waste key on the FAP is selected. A tank symbol with a scale
shows the liquid level as a percentage. The service door OPEN
information, delivered by the door microswitch located on the potable
water service panel, is sent to the FAP through a Decoder/Encoder Unit
(DEU) B and the active Cabin Intercommunication Data System (CIDS)
director to energize the water quantity indicating system.
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FAP

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WASTER WATER SYSTEM D/O (3)

GENERAL
The waste water drain system discards the waste water from the lavatory
wash basins and from the galley sinks.

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

NOTE: The control knob is operated by the lavatory user.

DRAIN VALVE
Each drain valve opens only when a certain amount of water is collected.
This prevents a permanent loss of cabin air pressurization through the
drain lines.

DRAIN MAST
In flight, differential pressure between the cabin and the drain mast outlet
discards the waste water. On ground, gravity discards the waste water.
The drain masts are electrically heated to prevent ice formation.
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GENERAL ... DRAIN MAST

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TOILET SYSTEM PRINCIPLE (2)

GENERAL
Potable water from the aircraft pressurized potable water system is used
to flush the toilet bowl. Differential pressure between the cabin and the
atmosphere moves the waste from the toilet bowl to the waste holding
tank. This difference of pressure can be caused by the vacuum generator
or by aircraft pressurization.

RINSE/FLUSH CONTROL
A flush control unit per toilet controls the time and sequence of the toilet
operation during the flushing cycle.

VACUUM CONTROL
A vacuum generator is connected to the aircraft power circuit through
the motor starting relay. As soon as a FLUSH switch is pressed, the flush
control unit sends an electrical signal, through the connected
Decoder/Encoder Unit (DEU) B to the Cabin Intercommunication Data
System (CIDS) directors, which activates the motor starting relay
according to the altitude. The Cabin Pressure Controller (CPC) supplies
altitude data to CIDS via the System Data Acquisition Concentrator
(SDAC). At high altitude, the CPC stops the electrical supply of the
vacuum generator, the differential pressure between the cabin and the
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atmosphere being sufficient to move the waste from the toilet bowl to
the waste holding tank. At low altitude or on ground, the vacuum
generator generates the necessary differential pressure.

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GENERAL ... VACUUM CONTROL

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TOILET SYSTEM DESCRIPTION (2)

GENERAL STORAGE
The toilet system removes waste from the toilet bowl through a vacuum The waste holding tank is installed on the right hand side of the aircraft
drain to an underfloor waste holding tank. The vacuum toilet system is under the floor between FRame 65 and FR 68. The tank has a capacity
connected to the Cabin Intercommunication Data System (CIDS), which of 170 l (44.9 US gal). The tank has:
controls and monitors the system function and the related electric - a water separator,
components. The system uses potable water from the potable water system - a liquid level transmitter (hydrostatic pressure),
to flush the toilet. - a liquid level sensor (ultrasonic type),
- waste inlets,
FLUSHING - a waste outlet,
- two flush inlet nozzles.
When the FLUSH switch is pressed, the flush control unit initiates the
flush sequence. The vacuum generator starts to operate and after 1.6 CONTROL/MONITORING
seconds the water valve opens for 1.7 seconds. Then, the flush valve,
controlled by the flush control unit, opens for 4 seconds to evacuate the The waste system data is received by DEUs B and sent to the CIDS
waste material through differential pressure. directors (DIRs). This system is controlled and monitored by the Vacuum
System Controller (VSC) function, which is integrated inside the CIDS
VACUUM DIRs. It also reports the vacuum toilet system failures to the Centralized
Fault Display System (CFDS) and to the RS 232-C interface for shop
As soon as the FLUSH switch is pressed, the flush control unit sends an
maintenance.
electrical signal to the CIDS (via the connected Decoder/Encoder Unit
(DEU) B), which operates the vacuum generator for approximately 15 INDICATING
seconds. The vacuum generator creates the necessary differential pressure
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between the cabin and the waste holding tank to move the waste from The waste holding tank is equipped with a liquid level transmitter and a
the toilet bowl. The vacuum generator is activated: liquid level sensor. When the tank is full, a signal is sent to the CIDS
- on ground, DIRs through the DEU B, which shuts down the toilet systems. The signal
- during climb when the differential pressure is less than 246 mbar, is also sent to the Flight Attendant Panel (FAP) through the DIRs and a
- during descent when the differential pressure is less than 203 mbar. "WASTE TANK NOT EMPTY-CHECK LEVEL GROUND SERVICE
The different pressure information is supplied by the Cabin Pressure REQUIRED" message is displayed.
Controller (CPC) via the System Data Acquisition Concentrator (SDAC).
SERVICING
NOTE: The landing gear signal is used as a back up in case of CPC or
The waste holding tank is serviced from a service panel, which is located
SDACs failure.
on the right of the lower fuselage between FR 65 and FR 66. It has:
- a drain connection,
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- a rinse/flush connection,
- an optional waste quantity indicator,
- a waste drain valve control handle,
- a limit switch.
During servicing, the flush control units are automatically de-activated.
Thus, toilet use is inhibited during servicing. The waste drain control
handle mechanically operates the drain valve.
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GENERAL ... SERVICING

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TOILET SYSTEM CONTROLS & INDICATING (2)

GENERAL
The toilet system controls and indicating include the waste quantity
indication on the Flight Attendant Panel (FAP) and optionally on the
toilet service panel located at the bottom of the rear aircraft fuselage.

TOILET SERVICE PANEL

The toilet service panel is installed in the rear right hand side of the
fuselage between FRame 65 and FR66.
DOOR LIMIT SWITCH
On ground, when the toilet service panel door is open, the Cabin
Intercommunication Data System (CIDS) stops all toilet operations
through the Decoder/Encoder Unit (DEU) B and flush signals are
inhibited.
DRAIN CONTROL HANDLE
During ground service, the drain control handle located at the service
panel is used for the waste holding tank draining.
WASTE QUANTITY INDICATOR (OPTIONAL)
The waste quantity indicator (if installed) displays the waste quantity
stored in the waste holding tank.
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GENERAL & TOILET SERVICE PANEL

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TOILET SYSTEM CONTROLS & INDICATING (2)

FAP WATER/WASTE PAGE
The FAP is located in the forward section of the cabin. The FAP
WATER/WASTE page appears by selecting the dedicated key on the
tool bar. It can also appear automatically when the service door is open
or when there is a fault in the system. This page gives information about
the water and waste system. Fault, system and inoperative messages for
the vacuum lavatories are also indicated on the FAP.
WASTE QUANTITY
The FAP displays the waste quantity stored in the waste holding tank.
A waste tank symbol displays the filling level in percentage.
LAVATORY
On the aircraft symbol, the location of the lavatory is shown either
activated with a grey square or de-activated with an amber square and
its associated name. A lavatory is de-activated when the flush control
unit is inoperative. An amber cross is displayed on the square in case
of no communication with the flush control unit.
STATUS AND FAULT MESSAGES
Status and fault messages of the water and waste system are displayed
on a dedicated window.
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NOTE: On ground, when the toilet service panel is open the

"VACUUM SYSTEM DISABLED-GROUND
SERVICING" message comes on.
RESET WARNING
A RESET WARNing button is used in case of flush valve failure. All
visual warnings are reset by this same button (Area Call Panel,
Attendant Indication Panel and lavatory call light).

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FAP WATER/WASTE PAGE - WASTE QUANTITY ... RESET WARNING

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TOILET SYSTEM MONITORING (3)

symbol to indicate if a lavatory is inoperative or if the whole toilet system
GENERAL is inoperative.
Examples of messages list box:
The toilet system is monitored by the Vacuum System Controller (VSC)
- LAVatory X flush control unit water valve failure: SHUT OFF WATER
function, which is integrated inside the Cabin Intercommunication Data
SUPPLY: LAV XX,
System (CIDS) director (DIR). During aircraft power-up on ground and
- 115V AC failure or generator overheat: VACUUM SYSTEM
during flight, the system external circuits of the vacuum toilet system are
DISABLED ON GROUND,
monitored continuously.
- liquid level transmitter failure: VACUUM SYSTEM DISABLED -
FLUSH CONTROL UNIT WASTE TANK FULL,
- liquid level sensor failure: MAINTENANCE REQUIRED - WASTE
The BITE in each flush control unit monitors the water valve, the flush WATER,
valve and the internal control circuitry. If a fault is detected, it is - service door open and landing gear down: VACUUM SYSTEM
transmitted through the Decoder/Encoder Unit (DEU) B to DIR 1 and 2 DISABLED - GROUND SERVICING.
of the CIDS. A CAUTion amber button, located in the upper left corner of the
touchscreen, comes on and flashes when CIDS receives a message which
VSC FUNCTION cannot be shown immediately.
The VSC functions integrated inside the CIDS DIRs are:
- system control and monitoring,
- fault reporting.
The DIR calculates and transmits signals to the Flight Attendant Panel
(FAP) and optionally to the waste service panel to indicate the waste tank
level and to report system defects. The DEU B transmits system defects
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to the DIR through the middle line data bus. The DIR memorizes the
defect signals and send them to the Centralized Fault Display System
(CFDS) for ground maintenance and inspection. The DEU B is also
connected to RS 232-C interface unit and used in Workshop.

NOTE: Each toilet assembly has a separate DEU B.

FAP WATER/WASTE PAGE INDICATING

The FAP WATER/WASTE page gives information about water and
waste. The waste tank level is displayed on this page. Fault, system and
inoperative messages can also be displayed in the list box and on the A/C
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GENERAL ... FAP WATER/WASTE PAGE INDICATING

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POTABLE WATER SYS SERVICING (A320) (2)

FILLING
The water service panel is located on the left side of the aft fuselage.
Electricity must be supplied to the panel. Use ground power and turns
on the MAINTenance BUS switch. When the panel door is open, the
light on the fill gauge indicates that the panel has power. As a back-up
check for electricity, press any one of the four indicator lights, they should
light up. Also on panel are the fill and drain port and the control handle.
To fill the water system, open the service door. Connect the fill hose to
the port. Turn the control handle counter clockwise to the FILL position
and pull out on the handle. Make sure the overflow valve opens: the
indicator light should light up. Turn on the water pump at the truck. The
quantity gauge will show when the system is taking on water. When the
tank is full the FULL light should come on. Turn off the pump of the
truck.
Push the control handle in and turn it back to the NORMAL position. On
some A320, the control handle is automatically pulled in and returns to
the NORMAL position by itself. Disconnect the hose and cap the port.
Before closing the door, clean and dry the service panel and check for
leaks, then close the access door.

NOTE: Filling of the potable water system is also available without

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electrical power( AMM Reference Task 12-15-38-613-002).

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FILLING

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POTABLE WATER SYS SERVICING (A320) (2)

DRAINING
Three drain ports controlled by the service panel are used to empty the
water system. The main drain port is located on the underside of the
aircraft directly below the water tank and next to the overflow port. A
few feet ahead of the main drain is another drain port for the forward lav
and galley lines. The port on the water service panel is used to drain the
lines for the rear lavs and galley. To drain the water system, move a
container under the main port.
At the control panel, uncap the port. Turn the control handle clockwise
to the DRAIN position and pull the handle out. Three indicator lights
should come on. They are: the OVERFLOW VALVE OPEN light, the
TANK DRAIN VALVE OPEN light and the FORWARD DRAIN
VALVE OPEN light. Most of the water will come out of the main drain,
only a small amount will come out of the forward and aft drains. When
the system is drained, push the control handle in. Make sure that it returns
to the NORMAL position. All the indicator lights should go off. Replace
the drain cap.
Make sure the service panel is clean and dry. Then close the panel door.
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DRAINING

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POTABLE WATER SYS SERVICING (A320) (2)

MISCELLANEOUS
Without electricity, you will have to use the following manual overrides:
- for filling, open the overflow valve,
- for draining, open both valves of the main drain and the one of the
forward drain.
Maintenance will eventually replaced the X screw holding in this panel
shut with a P/B latch. Information on cold weather water servicing will
be provided by your instructor.
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MISCELLANEOUS

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POTABLE WATER SYS SERVICING (A318/319/321) (2)

NORMAL FILLING
The water service panel is located on the left side of the aft fuselage.
Electricity must be supplied to the panel. Use ground power and turns
on the maintenance bus (MAINT BUS ON switch). When the service
panel is opened, the light on the fill gauge indicates that the panel has
power. Also on the panel are the fill and drain port and the control handle.
To fill the water system, connect the fill hose to the port. Turn the control
handle couterclockwise to the FILL position and pull out on the handle.
Turn on the water pump on the truck. The quantity gauge will show when
the system is taking on water. When the tank is full, the FULL light comes
on. The control handle returns to the NORMAL position by itself. Turn
off the pump on the truck. Disconnect the hose. Before closing the door,
clean and dry the service panel and check for leaks. Then, close the access
door.
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NORMAL FILLING

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POTABLE WATER SYS SERVICING (A318/319/321) (2)

MANUAL FILLING
If electrical power is not available, the manual filling procedure must be
used. To fill the water system, open the servicing panel. Connect the fill
hose to the port. Turn the control handle counterclockwise to the FILL
position and pull out on the handle. Turn on the water pump on the truck.
When the tank is full, the water comes out by the overflow port. Manually
push the control handle back in its NORMAL position. Turn off the pump
on the truck. Disconnect the hose. Before closing the door, clean and dry
the service panel and check for leaks. Then, close the access door.
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MANUAL FILLING

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TOILET SYSTEM SERVICING (2)

DRAINING
The lavatory service panel is located on the right side of the aft fuselage.
Open the service door. The controls consist of a drain port, two valve
levers, a drain control handle and a filling port. To empty the waste
system, open the cap assembly and connect the drain hose and next to it
the fill hose. Next to the drain connection is a small lever marked OPEN.
Push this lever in the direction of the arrow; the lever marked CLOSED
should rotate by spring action indicating that the valve has opened. Pull
the drain control handle outward to the extended position. This allows
waste materials to flow from the drain port. When the system is drained
return the control handle to the normal position. To flush the tank, use 5
gallons (19 l) of disinfectant commonly called "Blue Juice". Now drain
the system by extending the control handle. Once drained, return the
handle to the normal position. Replenish with 2 gallons (7,5 l) of blue
juice. You are now ready to disconnect hoses and replace the connection
caps on the drain and rinse ports. By closing the drain cap the drain valve
automatically closes. Clean and dry the panel with a clean cloth and do
not forget to close the service door. On the Forward Attendant Panel:
- if the LAV indicator light is on, reservice the system,
- if the light remains on, contact maintenance or maintenance control.
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DRAINING

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 AIRBUS S.A.S.
31707 BLAGNAC cedex, FRANCE
STM
REFERENCE U5F07351
SEPTEMBER 2007
PRINTED IN FRANCE
AIRBUS S.A.S. 2007
ALL RIGHTS RESERVED

AN EADS JOINT COMPANY

WITH BAE SYSTEMS