Failure of the Captain ACP

TASK 23-51-00-810-801-A
Failure of the Captain ACP

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-51-00-740-002	BITE Test of the Audio System
ASM 235102
AMM 23-51-12-000-001	Removal of the Audio Control Panel (ACP) (2RN1, 2RN2, 2RN3, 2RN4, 2RN5)
AMM 23-51-12-400-001	Installation of the Audio Control Panel (ACP) (2RN1, 2RN2, 2RN3, 2RN4, 2RN5)

3. Fault Confirmation
Subtask 23-51-00-740-050-A

A. Test
Do the BITE test of the Audio System AMM 23-51-00-740-002.

4. Fault Isolation
Subtask 23-51-00-810-050-B

A. If the test gives the maintenance message ACP1(2RN1):

(1) If there is 28VDC:

(2) If there is no 28VDC:

(a) If there is no ground signal:

Repair the wiring from the ACP-CAPT [2RN1] pin A/N to the ground terminal ASM 235102.

(b) If there is a ground signal:

Do a check and repair the wiring from the ACP-CAPT [2RN1] pin A/M to the first terminal block ASM 235102.

Subtask 23-51-00-740-051-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:43 UTC