AP 1 Engagement Inoperative

TASK 22-83-00-810-805-A
AP 1 Engagement Inoperative

1. Possible Causes

FMGC-1 [1CA1]
FCU [2CA]
wiring of the CMD 1 SW COM and CMD 1 SW MON discretes (from the FCU (2CA) to the FMGC 1 (1CA1))

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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

3. Fault Confirmation
Subtask 22-83-00-710-058-A

A. Test
(1) On the FCU, push the AP 1 pushbutton switch.
(2) 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 22-83-00-810-054-A

A. If the test gives the maintenance message AFS : FMGC1/FCU (AP1 SW):

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

(1) If the fault continues:

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

(2) If the fault continues:

do a check and repair the wiring of the CMD 1 SW COM and CMD 1 SW MON discretes (from the FCU (2CA) to the FMGC 1 (1CA1)) ASM 228503.

Subtask 22-83-00-710-059-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:29 UTC