Operational Test of the Potable Water-Distribution System (with the Air Supply Boost-System)

TASK 38-12-00-710-003-A
Operational Test of the Potable Water-Distribution System (with the Air Supply Boost-System)

NOTE: Only the operational test of the water-distribution system in a lavatory/galley is given. The procedure is the same for all other lavatories/galleys.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
171AL

B. Referenced Information

REFERENCE	DESIGNATION
TASK 12-15-38-613-001-A	Fill the Potable Water Tank System (Aircraft Electrical Power Available)
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)

3. Job Set-up
Subtask 38-12-00-861-051-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

NOTE: The air-compressor 8MD will operate when the aircraft electrical circuits are energized, and the air-pressure in the tank is below 22 psi.

Subtask 38-12-00-865-060-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2001VU	WATER-SYSTEM-DEPRESS	1MD	F03
** ON A/C NOT FOR ALL
2001VU	WATER SYS-QUANT-IND	1MA	B06
2001VU	WATER SYS-AIR-COMPRESSOR	19MD	F01
** ON A/C NOT FOR ALL
2001VU	WATER-SYSTEM-DEPRESS	1MD	D05

Subtask 38-12-00-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Get access to the lavatory/galley.
(2) Make sure that the potable water shutoff valve in the lavatory/galley is open.

Subtask 38-12-00-613-052-A ** ON A/C NOT FOR ALL

D. Fill the potable water system (Ref. AMM TASK 12-15-38-613-001).

Subtask 38-12-00-210-050-A ** ON A/C NOT FOR ALL

E. Make sure that the access panel 171AL is closed.

4. Procedure
Subtask 38-12-00-710-053-A ** ON A/C NOT FOR ALL

A. Test
(1) Do this test.

ACTION	RESULT
1.In the lavatory/galley: operate the water faucet.	In the lavatory/galley: water flows from the water faucet.

5. Close-up
Subtask 38-12-00-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the lavatory door.

Subtask 38-12-00-862-051-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:25:38 UTC