Operational Test of the Auxiliary Air Supply System.

TASK 38-42-00-710-001-A
Operational Test of the Auxiliary Air Supply System.

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)
No specific	1	CONTAINER 20L (5 USGAL)

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 38-42-00-861-050-A ** ON A/C NOT FOR ALL

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

Subtask 38-42-00-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put the ACCESS PLATFORM 1M(3 FT) in position at Zone 171.
(2) Open the service panel 171AL.

Subtask 38-42-00-480-050-A ** ON A/C NOT FOR ALL

C. Put the CONTAINER 20L (5 USGAL) under the drain mast 14DU.

Subtask 38-42-00-865-050-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2001VU	WATER SYS-AIR-COMPRESSOR	19MD	F01

Subtask 38-42-00-613-050-A ** ON A/C NOT FOR ALL

E. Fill the potable water tank (Ref. AMM TASK 12-15-38-613-001) with 50 l (13.2085 USgal) of water.

4. Procedure
Subtask 38-42-00-710-050-A ** ON A/C NOT FOR ALL

A. Do this test.

NOTE: Make sure that the compressor does not leak.

ACTION	RESULT
1.In an aft lavatory: operate the water faucet to release the pressure in the potable water system.	In the lavatory: water flows into the wash basin. the flow rate of the water decreases.
2.At the service panel 2023VU: push and hold the limit switch 5MA.	In the air boost system: the pressure switch 10MD closes. the relay 9MD is energized. the air compressor 8MD starts to operate. the potable water system starts to pressurize.
	In the lavatory: the water flow increases.
3.At the service panel 2023VU: release the limit switch 5MA.	In the air boost system: the relay 9MD is de-energized. the air compressor 8MD stops.

5. Close-up
Subtask 38-42-00-613-051-A ** ON A/C NOT FOR ALL

A. If necessary fill the potable water tank (Ref. AMM TASK 12-15-38-613-001).

Subtask 38-42-00-080-050-A ** ON A/C NOT FOR ALL

B. Remove the container from below the drain mast.

Subtask 38-42-00-410-050-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the service panel 171AL.
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 38-42-00-862-050-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.02 07:19:45 UTC