Loss of the AP2 OWN Discretes

TASK 22-11-00-810-812-A
Loss of the AP2 OWN Discretes

1. Possible Causes

FMGC-2 [1CA2]
FWC-2 [1WW2]
ELAC-2 [2CE2]
FAC-2 [1CC2]
wiring of the AP OWN ENGD MON OWN discrete (from the FMGC 2 (1CA2) pin AE/12G to the first terminal block)
wiring of the AP OWN ENGD COM OWN discrete (from the FMGC 2 (1CA2) pin AB/10D to the first terminal block)
FCU [2CA]

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 22-81-12-000-001	Removal of the FCU
AMM 22-81-12-400-001	Installation of the FCU
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 22-11-00-710-060-A

A. Test
(1) Do the operational test of the AFS AMM 22-96-00-710-001 and read the results for the FMGC 2 and the FAC 2.
(2) On the FCU, push the AP2 pushbutton switch.
(3) Do the operational test of the AFS AMM 22-96-00-710-001 again and read the results for the FMGC 2 and the FAC 2.

4. Fault Isolation
Subtask 22-11-00-810-061-A

A. If one of the tests gives the maintenance messages:
AFS: FMGC2/AP ENGD FDBK and
AFS: FAC2/AP2 ENGD WIRING

Replace the FMGC-2 [1CA2] 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 OWN discrete
. Related to the AP OWN ENGD COM OWN discrete ASM 228503.
If you do not find fault during the troubleshooting procedure (Ref. TSM TASK 31-32-00-810-932), go to Para. (d).

(a) If the fault continues:

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

(b) If the fault continues:

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

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

(d) If the fault continues:

Do a check and repair the wiring of the AP OWN ENGD MON OWN discrete (from the FMGC 2 (1CA2) pin AE/12G to the first terminal block)
Do a check and repair the wiring of the AP OWN ENGD COM OWN discrete (from the FMGC 2 (1CA2) pin AB/10D to the first terminal block) ASM 228503.

(2) If the fault continues:

Replace the FCU [2CA] AMM 22-81-12-000-001 and AMM 22-81-12-400-001.

Subtask 22-11-00-710-061-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:06 UTC