Loss of the TCAS Input Bus Detected by the FWC1

TASK 31-53-00-810-907-A
Loss of the TCAS Input Bus Detected by the FWC1

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
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)
ASM 344301

3. Fault Confirmation
Subtask 31-53-00-710-248-A

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

4. Fault Isolation
Subtask 31-53-00-810-156-A

A. If the test gives the maintenance message:
FWC1 : NO DATA FROM TCAS

(1) If the fault continues:

do a check and repair the wiring from FWC1 (1WW1) pins AE/5A, 5B to the first terminal block ASM 344301.

Subtask 31-53-00-710-249-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:19 UTC