Loss of the Data Output Bus of the FWC2

TASK 31-53-00-810-967-A
Loss of the Data Output Bus of the FWC2

1. Possible Causes

FWC-2 [1WW2]
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 31-53-00-710-311-A

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

4. Fault Isolation
Subtask 31-53-00-810-201-A

A. If the test gives the maintenance message:

FWC1 :NO DATA FROM OPPOSITE FWC

replace the FWC-2 [1WW2] 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 2 (1WW2) pins AE/12B, 12C to the first terminal block.
(b) from the FWC 2 (1WW2) pins AB/12F, 12G to the first terminal block.
(c) from the FWC 2 (1WW2) pins AB/12J, 12K to the first terminal block.

Subtask 31-53-00-710-312-A

B. Do the test given in Para. 3.

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