Failure of the FWC 1 A320
1. Possible Causes:
-FWC-1 (1WW1)
-wiring
-C/B FWS/FWC1/SUPLY
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
| Ref. AMM 31-50-00-710-001 | Ground Scanning of the Central Warning System |
| Ref. ASM 31-51-01 | |
| Ref. AMM 31-53-34-000-001 | Removal of the Flight Warning Computer (FWC) |
| Ref. AMM 31-53-34-400-001 | Installation of the Flight Warning Computer (FWC) |
3. Fault Confirmation
SUBTASK 31-53-00-710-056-A
A. Test(s)
(1) Do the ground scanning of the central warning system Ref. AMM 31-50-00-710-001.
4. Fault Isolation
SUBTASK 31-53-00-810-053-A
A. If the test gives the maintenance message:
FWC1
— do a check of the status of the circuit breaker (3WW).
(1) If the circuit breaker (3WW) is closed:
— replace the FWC-1 (1WW1), Ref. AMM 31-53-34-000-001 and Ref. AMM 31-53-34-400-001.
(a) If the fault continues:
— do a check of the wiring from the FWC 1 (1WW1) pin AC/1 to the circuit breaker (3WW) , Ref. ASM 31-51-01.
1 If there is no continuity:
— repair the wiring given above.
2 If there is continuity:
— replace the C/B FWS/FWC1/SUPLY
(2) If the circuit breaker (3WW) is open:
— close the circuit breaker.
(a) If the circuit breaker is open again:
— replace the FWC-1 (1WW1).
1 If the fault continues:
— do a check and repair for a short to ground the wiring between the circuit breaker (3WW) and the FWC 1 (1WW1).
(b) If the circuit breaker stays closed and the fault continues:
— replace the FWC-1 (1WW1).
SUBTASK 31-53-00-710-057-A
B. Do the test given in Para. 3.
