Loss of the Bus Output from the FWC2 detected by the CFDIU

TASK 31-53-00-810-914-A
Loss of the Bus Output from the FWC2 detected by the CFDIU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-869-002	Procedure for the Class 3 Fault Reading
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 31-53-00-865-065-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	EIS/FWC2/SPLY	2WW	Q07

Subtask 31-53-00-740-076-A

B. Test
On the CFDS MENU page, get access to the AVIONICS STATUS page AMM 31-32-00-869-002.

4. Fault Isolation
Subtask 31-53-00-810-163-A

A. If the test gives the maintenance message NO FWC2 DATA:

(1) If the fault continues:

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

Subtask 31-53-00-740-077-A

B. Do the test given in Para. 3.B.

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