Pack 1/2 Compressor Outlet Temperature Fault

TASK 21-61-00-810-870-A
Pack 1/2 Compressor Outlet Temperature Fault

WARNING: PUT ON PROTECTIVE GOGGLES AND THERMAL GLOVES WHEN YOU GO NEAR AN AIR-CONDITIONING PACK WHEN IT OPERATES. THERE CAN BE LEAKAGE OF HOT AIR, WHICH CAN CAUSE INJURIES.

1. Possible Causes

heat exchanger unit
seals

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 12-33-21-618-001	Pre-conditioning through the LP Ground Connection

3. Fault Confirmation
Subtask 21-61-00-810-201-A

A. Access
(1) Get access to the heat exchanger areas for both packs.

Subtask 21-61-00-710-154-A

B. Test

NOTE: The fault indications cannot be reproduced on the ground.

(1) Do the pre-conditioning with the APU AMM 12-33-21-618-001.

4. Fault Isolation
Subtask 21-61-00-810-202-A

A. Leak Check
(1) In each heat exchanger unit area do a check for hot air leaks at:

the duct connections, the welded joints and all component surfaces.

(2) Leaks must be removed either by replacement of the applicable seals or by replacement of the faulty component.

5. Close-up
Subtask 21-61-00-860-093-A

A. Aircraft Maintenance Configuration
(1) Stop the pre-conditioning with the APU AMM 12-33-21-618-001.

[Rev.8 from Aug 2018] 2026.04.04 04:24:56 UTC