Operational Test of the Potable Water-Distribution System (with a Ground Air-Supply Cart)

TASK 38-12-00-710-002-A
Operational Test of the Potable Water-Distribution System (with a Ground Air-Supply Cart)

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

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	1	AIR SOURCE 1.7 TO 2 BAR (25 TO 30 PSI) - FILTERED, DRY

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
171AL

C. 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 38-12-00-861-052-A

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

Subtask 38-12-00-865-059-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2000VU	WATER SYSTEM-QANT-IND	1MA	B01
** ON A/C NOT FOR ALL
2001VU	WATER SYS-QUANT-IND	1MA	B06

Subtask 38-12-00-010-051-A

C. Get Access
(1) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position at Zone 171.
(2) Get access to the lavatories and galleys.
(3) Make sure that the potable water shutoff valve in the lavatories and in the galleys is set to the OPEN position.

Subtask 38-12-00-613-053-A

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

NOTE: Do not close the access panel 171AL.

Subtask 38-12-00-480-050-A

E. Connect the Ground Air-Supply Cart
(1) Put the AIR SOURCE 1.7 TO 2 BAR (25 TO 30 PSI) - FILTERED, DRY in position at Zone 171.
(2) Connect the ground air-supply cart to the ground air-pressure connection at the service panel 2023VU.

4. Procedure
Subtask 38-12-00-614-051-A

A. Presurize the Potable Water System
(1) Open the ground air-pressure charging-valve at the service panel 2023VU.
(2) Operate the reducing valve of the ground air-supply cart and pressurize the potable water tank to 23 +3 psi or -3 psi (1.5858 +0.2068 bar or -0.2068 bar).

Subtask 38-12-00-710-054-A

B. 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 38-12-00-080-050-A

A. Disconnect the Ground Air-supply Cart
(1) Close the ground air-pressure charging-valve at the service panel 2023VU.
(2) Disconnect and remove the ground air-supply cart.

Subtask 38-12-00-410-051-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access panel 171AL.
(3) Remove the access platform(s).

Subtask 38-12-00-862-052-A

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

[Rev.10 from 2021] 2026.04.01 04:27:16 UTC