Failure of the Avionics Compartment ACP

TASK 23-51-00-810-804-A
Failure of the Avionics Compartment 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 235105
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 23-51-00-740-056-A

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

4. Fault Isolation
Subtask 23-51-00-810-053-D

A. If the test gives the maintenance message ACP4(2RN4):

(1) If there is 28VDC:

(2) If there is no 28VDC:

Do a check and repair the wiring from:
. The AMU [1RN] pin A/M to the circuit breaker C/B-COM NAV/ACP/AVNCS/COMPT [7RN] .
. The AMU [1RN] pin A/N to the ground terminal ASM 235105.

Subtask 23-51-00-740-057-A

B. Do the test given in Para. 3.

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