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

TASK 31-53-00-810-876-A
Loss of the LH SLT SYNC Signal Output by the FWC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 278501
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
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 31-53-00-710-186-A

A. Do the operational test of the central warning systems (FWC) AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-53-00-810-125-A

A. If the test gives the maintenance message FWC1: LH SLT SYNC 4CNA:

(1) If the fault continues:

do a check and repair the wiring from FWC1 (1WW1) pins AA/13G, 13H, 13J to the first terminal block ASM 278501.

Subtask 31-53-00-710-187-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:16 UTC