a380-Level III - Ata 38 Water_waste

5/25/2018 a380-Level III - Ata 38 Water_waste

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A380TECHNICAL TRAINING MANUAL

MAINTENANCE COURSE - T1 & T2 (RR / Metric)LEVEL III - ATA 38 Water/Waste


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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.


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LEVEL III - ATA 38 WATER/WASTEPotable Water System Description (3) . . . . . . . . . . . . . . . . . . . . . . . . . 2

Toilet System Description (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Waste Water Drain System Description (3) . . . . . . . . . . . . . . . . . . . . 28

Water/Waste System Maintenance (3) . . . . . . . . . . . . . . . . . . . . . . . . 30Water/Waste System Component Location (3) . . . . . . . . . . . . . . . . . 34


TABLE OF CONTENTS Mar 21, 2006

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POTABLE WATER SYSTEM DESCRIPTION (3)

General Architecture

The potable water tanks are installed in the FWD area of the AFT cargo

compartment, above the body landing gear boxes (three on the LH side

and three on the RH side). As option, two additional tanks can be installed

(one on each side). Each tank has a capacity of 283 liters (75 US gallons)

for a basic total volume of 1700 liters (449 US gallons).

The potable water is distributed to the galley and lavatory faucets and to

the toilets and Galley Waste Disposal Units (GWDUs) for flushing.

Two compressors fulfill the tanks pressurization. For maintenance, it is

possible to pressurize the tanks by using a ground pressure connection.

Before distribution, a treatment module filters, heats and purifies the

potable water.

The filling of the water tanks is done from the potable water service panelinstalled in the AFT lower fuselage. The draining of the complete system

is done from the potable water service panel and from the FWD drain

panel installed in the FWD lower fuselage.

A depress valve, installed near the service panel, is used for system

depressurization on ground.


POTABLE WATER SYSTEM DESCRIPTION (3) Mar 17, 2006

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GENERAL ARCHITECTURE



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Potable Water Storage

The potable water tanks numbering is organized as follows:

- tanks number 1, 3, 5 (and 7 as option) on the LH side,

- tanks number 2, 4, 6 (and 8 as option) on the RH side.

Each tank has a recirculation port, an overflow port and a fill/drain port.

The middle tanks number 3 and 4 have an ultrasonic level sensor installed

in the bottom.

Note that the level sensors transmit the water level data to the Potable

Water Indication Panel (PWIP) for calculation. The average value of the

water quantity in the tanks is shown on the FAPs and on the PWIP.



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POTABLE WATER STORAGE



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Air Supply System

The air supply system supplies pressurized air to the potable water system

by means of two compressors installed on the LH side near the potable

water tanks.

The normal operating pressure of the system is between 35 psi and 41

psi.

An electric motor operates each compressor. An air compressor motor

controller, installed near the compressors, controls each motor.

The air is picked-up in the cargo compartment through an inlet filter

mounted on each compressor, and sent under pressure to an air manifold

assembly installed above the compressors.

The air manifold assembly has:

- two pressure switches (one low pressure and one high pressure) for afeedback to the controllers,

- an over pressure relief valve, which opens when the pressure reaches

130 psi,

- a ground pressure connection,

- filters, to make sure that unwanted material do not go into the potable

water system,

- air check valves, to prevent a backflow of air.



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AIR SUPPLY SYSTEM



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Potable Water Treatment Module

The potable water treatment module, installed on the RH side near the

potable water tanks, has:

- a circulation pump, installed just near the treatment module on the inlet

pipe. The pump, driven by an electric motor, helps the water circulation

inside the module,

- an inhibition of scaling module, which has a magnetic tube removing

scale deposits and particles. There is no maintenance servicing on it,

- a water heater, which warms-up the water entering in the loop.

The heating and disinfection control unit manages all the electrical

components of the potable water treatment module. It switches ON/OFF

the circulation pump as well as the water heater, in order to keep a

temperature range of 6-15C.



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POTABLE WATER TREATMENT MODULE



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Lavatory Water Supply Assembly

The lavatory water supply assembly has:

- a manual shut-off valve, installed below the sink. It isolates the water

going to the faucet and also to the toilet unit for flushing,

- a water heater, which warms-up the water up to 50C,

- a mixing unit, which mixes the hot and cold water to satisfy the water

supply temperature demand.

The lavatory water supply assembly control device receives the

temperature demand from the infrared controlled faucet and manages the

mixing process accordingly.



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LAVATORY WATER SUPPLY ASSEMBLY



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Control System Architecture

The PWIP, the heating and disinfection control unit, the air compressor

motor controllers and the lavatory water supply assembly control devicesmonitor and control the performance of their related system components.

Note that the PWIP manages the potable water quantity (level sensors

signal), the pre-selection and the valves operations (fill/drain, FWD drain

and depress valves).

The PWIP and the FAPs are the main controllers and indicators of the

potable water system.

The Cabin Intercommunication Data System (CIDS) directors, through

the vacuum system control function, manage the data exchange between

the potable water system components and some A/C systems like:

- the FAPs,- the Onboard Maintenance System (OMS) for failure report and tests,

- the Landing Gear Extraction Retraction System (LGERS).



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CONTROL SYSTEM ARCHITECTURE



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Water/Waste FAP Page

The Water/Waste FAP page has the following functions:

- indication of potable water quantity in the tanks,- indication of A/C configuration (location of lavatories and galleys),

- indication of system status,

- indication of failure messages,

- system depressurization on ground ("Water Depr." button),

- system depressurization in flight ("Shut Down" button),

- isolation of water distribution areas ("Shut Off LH" and "Shut Off RH"

buttons),

- water pre-selection ("Pre-Select" button).



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WATER/WASTE FAP PAGE



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TOILET SYSTEM DESCRIPTION (3)


The toilet system is divided into four independent subsystems, which

are:- the LH main deck,

- the RH main deck,

- the LH upper deck and,

- the RH upper deck.

Each subsystem has:

- toilet assemblies,

- Galley Waste Disposal Units (GWDUs),

- a waste tank,

- a waste separator with filter,

- a high level sensor,- two absolute pressure sensors,

- an overboard check valve,

- a vacuum generator,

- a waste drain valve connected to an individual control handle on the

waste service panel.

The waste tanks are installed in the under floor area behind the bulk cargo

compartment. The tanks for the main deck toilets and GWDUs have a

capacity of 675 liters each (178 US gallons). The tanks for the upper deck

toilets and GWDUs have a capacity of 373 liters each (98 US gallons).

The toilet system uses potable water to flush the toilets and the GWDUs.

The waste materials are transported into the waste tanks through flushvalves by cabin differential pressure.

When this differential pressure is insufficient, at altitudes below 16000

ft., the vacuum generators generate the necessary vacuum in the waste

tanks to fulfill the waste flow.

During servicing, the waste tanks are drained then rinsed from the waste

service panel installed in the AFT lower fuselage.


TOILET SYSTEM DESCRIPTION (3) Mar 17, 2006

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Toilet Assembly and GWDU

The toilet assembly and the GWDU have:

- a flush switch, which initiates the actuation of a flush sequence,- a rinse valve, which opens to spray potable water into the bowl for

rinsing,

- a flush valve, which opens to evacuate the waste materials to the waste

tanks,

- a Multi Purpose Interface (MPI) installed on the toilet or the GWDU

frame, which controls and sequences the rinse and flush functions.

Using the data from the weight sensing device, the toilet assembly MPI

can discriminate between a "seated" and a "standing" user and vary the

rinse water quantity accordingly. The MPI starts a short flush cycle for

a "standing" user and a long flush cycle for a "seated" user.The GWDU has two flushing modes:

- mode 1: wet flush, used for waste materials discard. The GWDU MPI

carries out a flush sequence with rinsing by using potable water.

- mode 2: dry flush, used for liquids discard only. The GWDU MPI carries

out a flush sequence without rinsing, in order to reduce the consumption

of potable water when not required. Pressing twice in a second the flush

switch activates this special mode.



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TOILET ASSEMBLY AND GWDU



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Waste Tank Assembly and Associated Equipment

The waste tank assembly has:

- a waste tank,- a waste inlet with a flow diverter, which directs the waste materials to

the bottom of the tank,

- a waste separator with a filter, which separates the waste materials from

the air to make sure that only clean air will flow overboard,

- an ambient absolute pressure sensor installed on the air outlet of the

waste separator, which measures the air pressure above the waste surface

in the waste tank,

- a hydrostatic absolute pressure sensor installed at the bottom of the

waste tank, which measures the hydrostatic pressure. It calculates the

waste level in the tank with the received ambient and hydrostatic data,- a high level sensor installed in the upper section of the waste tank, which

provides the "full tank" signal in order to stop the related subsystem,

- three rinse nozzles installed on the top of the tank to rinse the tank and

introduce disinfection fluids.

A differential pressure is necessary to move the waste materials from the

toilets assemblies and the GWDUs to the waste tank. To obtain the

necessary vacuum in the tank when the altitude is below 16000 ft., a

vacuum generator operates, creating a differential pressure between 4 psi

(0,28 bar) and 9 psi (0,62 bar) below the cabin pressure.

A Motor Controller Interface (MCI) installed adjacent to the vacuum

generator controls the operation of the vacuum generator.When a flush sequence is initiated at a toilet assembly or a GWDU, the

MCI receives a signal from the related MPI.

Before the MCI supplies electrical power to the related vacuum generator,

it controls the flight phase data (ground signal, altitude) received from

the Landing Gear Extraction Retraction System (LGERS) and the Air

Data/Inertial Reference Units (ADIRUs) through the Cabin

Intercommunication Data System (CIDS).

Note that the MCI also receives a discrete landing gear status signal in

case of CIDS lost.

The MCI is connected to the service panel limit switch. Thus, when the

waste service panel door is opened and the A/C is on ground, the operationof the toilet system is inhibited.

Finally, the MCI is connected to the related high level sensor. Thus, when

a "full tank" signal is detected, the related subsystem is inhibited in order

to prevent an overflow of the waste materials storage.



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WASTE TANK ASSEMBLY AND ASSOCIATED EQUIPMENT



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Flush Sequence

The activation of the flush switch on a toilet assembly or on a GWDU

initiates the actuation of a flush sequence.The related MPI starts a timed sequence that includes the analysis of the

flush requirements (control of the flight phase data, "standing" or "seated

user", dry or wet flush...) before the flush cycle starts.

For a toilet assembly:

- 2.1 seconds after the beginning of the flush cycle, the rinse valve opens

during 0.9 second for a long flush ("seated" user), and during 0.3 second

for a short flush ("standing" user).

- 2.5 seconds after the beginning of the flush cycle, the flush valve opens

during 4 seconds.

The duration of the complete flush cycle is 9 seconds.For a GWDU:

- 8 seconds maximum (according to the required vacuum pressure) after

the beginning of the flush cycle, the rinse valve opens during 0.95 second

for a normal wet flush. For a dry flush the rinse valve is not activated.

- 1 second after the actuation of the rinse valve, the flush valve opens

during 4 seconds.

- 9 seconds after the actuation of the flush valve, the flush cycle is

complete.



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FLUSH SEQUENCE



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Control System Architecture

The following components have a microprocessor and are interconnected

via CAN bus:- toilet assembly MPIs,

- GWDU MPIs

- vacuum generator MCIs,

- hydrostatic and ambient absolute pressure sensors,

- high level sensors.

The CIDS directors, through the vacuum system control function, manage

the data exchange between the toilet system components and some A/C

systems like the FAPs, the Onboard Maintenance System (OMS), the

LGERS and the ADIRUs.

The FAPs are the main controllers and indicators of the toilet system.The interface with the OMS is used for failure report and test of the toilet

system.

The LGERS and ADIRUs give flight phase data (ground signal and

altitude) for the control of the vacuum system.



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CONTROL SYSTEM ARCHITECTURE



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Water/Waste FAP Page

The Water/Waste FAP page has the following functions:

- indication of waste quantity in the tanks,- indication of A/C configuration (location of lavatories and galleys),

- indication of system status,

- indication of failure messages,

- auto flush ("Auto Flush" button),

- rinse valve warning reset ("Reset Warn." button).



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WATER/WASTE FAP PAGE



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WASTE WATER DRAIN SYSTEM DESCRIPTION (3)


The waste water drain-system discards overboard the waste water from

the galley sinks and the lavatory washbasins.The waste water flows through the drain valves to the FWD and the AFT

heated drain masts installed on the lower fuselage.

The waste water is achieved by gravity on ground and by differential

pressure in flight.

The diaphragm type drain valves are usually closed. They open only if

a sufficient amount of waste water is collected. This prevents a continuous

leakage of the cabin air through the drain lines.

To prevent icing, the drain masts are electrically heated.


WASTE WATER DRAIN SYSTEM DESCRIPTION (3) Mar 17, 2006

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WASTE WATER DRAIN SYSTEM DESCRIPTION (3) Mar 17, 2006

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WATER/WASTE SYSTEM MAINTENANCE (3)

Potable Water System Tests

Potable Water System (PWS) tests are done to check several functions

of the system.

OMS Interactive Tests Overview

The PWS has the following interactive tests:

- system test,

- valve test.

These tests are launched from the OMS HMI (using the OMT, OIT

or PMAT).

System Test

The system test does a check of all monitored components of the PWS:

- the Potable Water Indication Panel (PWIP),- the level sensors,

- the air compressor motor controllers,

- the heating and disinfection control unit,

- the fill/drain valve,

- the FWD drain valve,

- the depress valve,

- the optional valves.

Valve Test

The valve test does a check of all installed valves of the PWS:

- the fill/drain valve,

- the FWD drain valve,

- the depress valve,

- the optional valves.


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POTABLE WATER SYSTEM TESTS - OMS INTERACTIVE TESTS OVERVIEW ... VALVE TEST



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WATER/WASTE SYSTEM MAINTENANCE (3)

Vacuum Toilet System Tests

Vacuum Toilet System (VTS) tests are done to check several functions

of the system.

OMS Interactive Tests Overview

The VTS has the following interactive tests:

- system test,

- subsystem test MD/LH,

- subsystem test MD/RH,

- subsystem test UD/LH,

- subsystem test UD/RH.

These tests are launched from the OMS HMI (using the OMT, OIT

or PMAT).

System Test

The system test does a check of all monitored components of the VTS:

- the vacuum generator Motor Controller Interfaces (MCIs) of all four

subsystems,

- the liquid level sensors of all four subsystems,

- the absolute pressure sensors of all four subsystems,

- the Multi Purpose Interfaces (MPIs) of all toilet assemblies and

Galley Waste Disposal Units (GWDUs) (refer to cabin layout).

Subsystem Test

The test of each vacuum toilet subsystem does a check of its relatedmonitored components:

- the vacuum generator MCI,

- the liquid level sensor,

- the two absolute pressure sensors,

- the MPIs of the related toilet assemblies and GWDUs.



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VACUUM TOILET SYSTEM TESTS - OMS INTERACTIVE TESTS OVERVIEW ... SUBSYSTEM TEST



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WATER/WASTE SYSTEM COMPONENT LOCATION (3)

FWD Fuselage

Rear Cargo Compartment

Potable Water

Waste Equipments

Cabin


WATER/WASTE SYSTEM COMPONENT LOCATION (3) Mar 17, 2006

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a380-Level III - Ata 38 Water_waste