Loss of the Data Output Bus of the FWC1

TASK 31-53-00-810-966-A
Loss of the Data Output Bus of the FWC1

1. Possible Causes

FWC-1 [1WW1]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
ASM 315205
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 31-53-00-710-309-A

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

4. Fault Isolation
Subtask 31-53-00-810-200-A

A. If the test gives the maintenance message:

FWC2 :NO DATA FROM OPPOSITE FWC

replace the FWC-1 [1WW1] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.

(1) If the fault continues:

do a check and repair the wiring ASM 315205:

(a) from the FWC 1 (1WW1) pins AE/12B, 12C to the first terminal block.
(b) from the FWC 1 (1WW1) pins AB/12F, 12G to the first terminal block.
(c) from the FWC 1 (1WW1) pins AB/12J, 12K to the first terminal block.

Subtask 31-53-00-710-310-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:22 UTC