Loss of the Data from the First Officer ACP to the AMU

TASK 23-51-00-810-809-A
Loss of the Data from the First Officer ACP to the AMU

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 235103
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)
AMM 23-51-34-000-001	Removal of the Audio Management Unit (AMU) (1RN)
AMM 23-51-34-400-001	Installation of the Audio Management Unit (AMU) (1RN)

3. Fault Confirmation
Subtask 23-51-00-740-066-A

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

4. Fault Isolation
Subtask 23-51-00-810-058-B

A. If the test gives the maintenance message ACP2(2RN2)/AMU(1RN):

(1) If the fault continues:

(a) If the fault continues:

Do a check and repair the wiring of the DATA OUT signal from the ACP-F/O [2RN2] pins A/H, G to the AMU [1RN] pins AB/13B, 14B ASM 235103.

Subtask 23-51-00-740-067-A

B. Do the test given in Para. 3.

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