Loss of the LH FLP SYNC Signal Output by the FWC 1

TASK 31-53-00-810-977-A
Loss of the LH FLP SYNC Signal Output by the FWC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 275501
AMM 31-32-00-869-002	Procedure for the Class 3 Fault Reading
AMM 31-53-34-000-001	Removal of the Flight Warning Computer (FWC)
AMM 31-53-34-400-001	Installation of the Flight Warning Computer (FWC)

3. Fault Confirmation
Subtask 31-53-00-710-334-A

A. On the CFDS MENU page, get access to the AVIONICS STATUS page AMM 31-32-00-869-002.

4. Fault Isolation
Subtask 31-53-00-810-234-A

A. If the test gives the maintenance message FWC1: LH FLP SYNC 3CNA:

(1) If the fault continues:

Do a check and repair the wiring from FWC1 (1WW1) pins AA/13B, 13C, 13D to the first terminal block ASM 275501.

Subtask 31-53-00-710-335-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:23 UTC