Leak Check of the Components in the Air Supply System

TASK 38-41-00-790-001-A
Leak Check of the Components in the Air Supply System

NOTE: You can use the bleed air supply as an alternative to the ground air supply to do the leak check.

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	GROUND AIR-SUPPLY UNIT(HIGH PRESSURE)

B. Consumable Materials

REFERENCE	DESIGNATION
No specific	soap solution

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
171AL

3. Job Set-up
Subtask 38-41-00-941-053-A

A. Put the ACCESS PLATFORM 1M(3 FT) in position at Zone 171.

Subtask 38-41-00-010-055-A

B. Open the access panel 171AL.

Subtask 38-41-00-480-053-A

C. Connect the GROUND AIR-SUPPLY UNIT(HIGH PRESSURE) to the ground air-pressure port.

4. Procedure
Subtask 38-41-00-790-050-A

A. Do the Leak Check
(1) Apply soap solution to the applicable connection(s).
(2) Operate the ground air-supply cart and pressurize the potable water system to 44 +3 psi or -3 psi (3.0337 +0.2068 bar or -0.2068 bar).
(3) Examine the connection(s) for leaks.

NOTE: Leaks are not permitted.

(4) Clean the connection(s).
(5) Release the pressure from the potable water system.

5. Close-up
Subtask 38-41-00-080-052-A

A. Disconnect the ground air-supply cart.

Subtask 38-41-00-410-056-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the potable-water service panel-door 171AL.

NOTE: Make sure that the latches are correctly locked and that the door makes a continuous surface with the skin of the aircraft.

(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 01:21:33 UTC