Loss of the ARINC 429 Output Bus from the FWC 2 to the FWC 1

TASK 31-53-00-810-802-A
Loss of the ARINC 429 Output Bus from the FWC 2 to the FWC 1

1. Possible Causes

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 31-53-00-710-052-A

A. Test
Do the operational test of the central warning systems (system 1) AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-53-00-810-051-A

A. If the test gives the maintenance message:
NO DATA FROM OPPOSITE FWC

(1) If the fault continues:

do a check and repair the wiring from the FWC 2 (1WW2) pins AE/12B, 12C to the first terminal block, ASM 315205.

Subtask 31-53-00-710-053-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:11 UTC