Loss of the AP1 OPP Discretes

TASK 22-11-00-810-814-A
Loss of the AP1 OPP Discretes

1. Possible Causes

FMGC-1 [1CA1]
FMGC-2 [1CA2]
FWC-2 [1WW2]
ELAC-2 [2CE2]
FAC-2 [1CC2]
wiring of the AP OWN ENGD MON OPP discrete (from the FMGC 1 (1CA1) pin AD/14D to the first terminal block)
wiring of the AP OWN ENGD COM OPP discrete (from the FMGC 1 (1CA1) pin AA/14B to the first terminal block)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 31-32-00-810-932-A	Failure of the Discrete Links
AMM 22-66-34-000-002	Removal of the FAC
AMM 22-66-34-400-002	Installation of the FAC
AMM 22-83-34-000-001	Removal of the FMGC
AMM 22-83-34-400-001	Installation of the FMGC
ASM 228503
AMM 22-96-00-710-001	Operational Test of the AFS
AMM 27-93-34-000-001	Removal of the ELAC
AMM 27-93-34-400-001	Installation of the ELAC
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 22-11-00-710-064-A

A. Test
(1) Do the operational test of the AFS AMM 22-96-00-710-001 and read the results for the FMGC 1 and the FAC 2.
(2) On the FCU, push the AP1 pushbutton switch.
(3) Do the operational test of the AFS AMM 22-96-00-710-001 again and read the results for the FMGC 1 and the FAC 2.

4. Fault Isolation
Subtask 22-11-00-810-063-A

A. If one of the tests gives the maintenance messages:
AFS: FMGC1/AP ENGD FDBK and
AFS: FAC2/AP1 ENGD WIRING

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

(1) If the fault continues:

Do the troubleshooting procedure (Ref. TSM TASK 31-32-00-810-932):
. Related to the AP OWN ENGD MON OPP discrete
. Related to the AP OWN ENGD COM OPP discrete ASM 228503.
If you do not find fault during the troubleshooting procedure (Ref. TSM TASK 31-32-00-810-932), go to Para. (e).

(a) If the fault continues:

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

(b) If the fault continues:

Replace the FWC-2 [1WW2] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.

Replace the ELAC-2 [2CE2] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.

(d) If the fault continues:

Replace the FAC-2 [1CC2] AMM 22-66-34-000-002 and AMM 22-66-34-400-002.

(e) If the fault continues:

Do a check and repair the wiring of the AP OWN ENGD MON OPP discrete (from the FMGC 1 (1CA1) pin AD/14D to the first terminal block)
Do a check and repair the wiring of the AP OWN ENGD COM OPP discrete (from the FMGC 1 (1CA1) pin AA/14B to the first terminal block) ASM 228503.

Subtask 22-11-00-710-065-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:07 UTC