Pack 1 Trim Air Check Valve Fault

TASK 21-63-00-810-850-A
Pack 1 Trim Air Check Valve Fault

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-63-00-710-005	Operational Test of the Trim Air Check-Valves
AMM 21-63-42-000-001	Removal of the Trim-Air Check Valves
AMM 21-63-42-400-001	Installation of the Trim-Air Check Valves

3. Fault Confirmation
Subtask 21-63-00-710-135-A

A. Do an operational test of the trim air check-valve AMM 21-63-00-710-005.

4. Fault Isolation
Subtask 21-63-00-810-141-A

A. If during the test the pack 1 discharge temperature increases:

replace the P1 CHECK VALVE TRIM AIR [18HM] AMM 21-63-42-000-001 and AMM 21-63-42-400-001.

Subtask 21-63-00-720-053-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:05 UTC