Loss of the Reception of the FWC VALID Discretes by one FMGC

TASK 22-83-00-810-847-A
Loss of the Reception of the FWC VALID Discretes by one FMGC

1. Possible Causes

FMGC-1 [1CA1]
wiring of the FWC OWN VALID and FWC OPP VALID discretes (from the FMGC 1 (1CA1) to the first terminal block)
FMGC-2 [1CA2]
wiring of the FWC OWN VALID and FWC OPP VALID discretes (from the FMGC 2 (1CA2) to the first terminal block)
FWC-1 [1WW1]
FWC-2 [1WW2]
wiring of the FWC VALID discrete from the FWC 1 (1WW1) to the first terminal block
wiring of the FWC VALID discrete (from the FWC 2 (1WW2) to the first terminal block)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-83-34-000-001	Removal of the FMGC
AMM 22-83-34-400-001	Installation of the FMGC
ASM 228504
AMM 22-97-00-710-001	Operational Test of the LAND CAT III Capability

3. Fault Confirmation
Subtask 22-83-00-865-074-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	FWS/FWC1/SPLY	3WW	F01
121VU	EIS/FWC2/SPLY	2WW	Q07

Subtask 22-83-00-710-126-A

B. Test
(1) Do the operational test of the LAND CAT III Capability AMM 22-97-00-710-001.

4. Fault Isolation
Subtask 22-83-00-810-122-A

A. If the test gives only the maintenance message AFS: FWC1 AND FWC 2 (ISSUED BY: FG1):

(1) If the fault continues:

do a check and repair the wiring of the FWC OWN VALID and FWC OPP VALID discretes (from the FMGC 1 (1CA1) to the first terminal block) ASM 228504.

Subtask 22-83-00-810-123-A

B. If the test gives only the maintenance message AFS: FWC1 AND FWC2 (ISSUED BY: FG2):

(1) If the fault continues:

do a check and repair the wiring of the FWC OWN VALID and FWC OPP VALID discretes (from the FMGC 2 (1CA2) to the first terminal block) ASM 228504.

Subtask 22-83-00-810-124-A

C. If the test gives the maintenance messages:
AFS: FWC1 AND FWC2 (ISSUED BY: FG1) and
AFS: FWC1 AND FWC2 (ISSUED BY: FG2):

(1) If the fault continues:

(2) If the fault continues:

do a check of the wiring of the FWC VALID discrete from the FWC 1 (1WW1) to the first terminal block ASM 228504.

(a) If there is no continuity:

(b) If there is continuity:

do a check and repair the wiring of the FWC VALID discrete (from the FWC 2 (1WW2) to the first terminal block) ASM 228504.

Subtask 22-83-00-710-127-A

D. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:32 UTC