Automatic Transfer of the FD 2 Indication to the PFD 1 Inoperative

TASK 22-83-00-810-831-A
Automatic Transfer of the FD 2 Indication to the PFD 1 Inoperative

1. Possible Causes

FMGC-2 [1CA2]
wiring of the FD OWN ENGD MON OPP discrete (from the FMGC 2 (1CA2) to the first terminal block)
DMC-1 [1WT1]
wiring of the FD 2 ENGD from the DMC 1 (1WT1) to the first terminal block
FMGC-1 [1CA1]
wiring of the FD OPP ENGD MON discrete (from the FMGC 1 (1CA1) to the first terminal block)
wiring of the FD OPP ENGD COM discrete (from the FMGC 1 (1CA1) to the FMGC 2 (1CA2))

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 228502
AMM 22-96-00-710-001	Operational Test of the AFS
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 31-60-00-860-001	EIS Start Procedure
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC

3. Fault Confirmation
Subtask 22-83-00-865-060-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AUTO FLT/FCU/1	9CA1	B05
49VU	AUTO FLT/FMGC/1	10CA1	B02
121VU	AUTO FLT/FCU/2	9CA2	M21
121VU	AUTO FLT/FMGC/2	10CA2	M17

Subtask 22-83-00-860-050-A

B. Aircraft Maintenance Configuration
(1) Do the EIS start procedure AMM 31-60-00-860-001.
(2) Make sure that the two FDs are engaged (if they are not engaged, push the FD pushbutton switches on the FCU).

Subtask 22-83-00-710-098-B

C. Test
(1) Open the circuit breaker 10CA1 and make sure that the FD 2 indication comes into view on the PFD 1.
(2) Close the circuit breaker 10CA1.
(3) Do the operational test of the AFS AMM 22-96-00-710-001 and read the result for the FMGC 1.

4. Fault Isolation
Subtask 22-83-00-810-090-B

A. If the FD 2 indication does not come into view on the PFD 1 and if the test gives the maintenance message AFS: FMGC1/FMGC2 (FD CKT):

replace the FMGC-2 [1CA2] , AMM 22-83-34-000-001 and AMM 22-83-34-400-001.

(1) If the fault continues:

do a check and repair the wiring of the FD OWN ENGD MON OPP discrete (from the FMGC 2 (1CA2) to the first terminal block), ASM 228502.

Subtask 22-83-00-810-091-A

B. If the FD 2 indication does not come into view on the PFD 1 and if no messages come into view after the test:

replace the DMC-1 [1WT1] , AMM 31-63-34-000-001 and AMM 31-63-34-400-001.

(1) If the fault continues:

do a check and repair the wiring of the FD 2 ENGD from the DMC 1 (1WT1) to the first terminal block, ASM 228502.

Subtask 22-83-00-810-092-A

C. If the FD 2 indication comes into view on the PFD 1 and if the test gives the maintenance message AFS: FMGC1/FMGC2 (FD CKT):

replace the FMGC-1 [1CA1] , AMM 22-83-34-000-001 and AMM 22-83-34-400-001.

(1) If the fault continues:

do a check of the wiring of the FD OPP ENGD MON discrete (from the FMGC 1 (1CA1) to the first terminal block), ASM 228502.

(a) If there is no continuity:

repair the above wiring.

(b) If there is continuity:

do a check and repair the wiring of the FD OPP ENGD COM discrete (from the FMGC 1 (1CA1) to the FMGC 2 (1CA2)), ASM 228502.

Subtask 22-83-00-710-099-A

D. Do the test given in Para. 3.

5. Close-up
Subtask 22-83-00-860-051-B

A. Put the aircraft back to its initial configuration.
(1) Close the circuit breaker 10CA1.
(2) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:25:31 UTC