Loss of the TCAS Output Bus Detected by the FWC1

TASK 31-53-00-810-906-A
Loss of the TCAS Output 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
ASM 344301
AMM 34-43-34-000-001	Removal of the TCAS Computer
AMM 34-43-34-400-001	Installation of the TCAS Computer

3. Fault Confirmation
Subtask 31-53-00-865-072-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	COM NAV/TCAS	4SG	K10

Subtask 31-53-00-710-246-A

B. Test
Do the ground scanning of the central warning systems AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-53-00-810-155-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 TCAS computer (1SG) pins AE/7C, 7D to the first terminal block ASM 344301.

Subtask 31-53-00-710-247-A

B. Do the test given in Para. 3.

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