CAPT (F/O, 3rd OCCPT) Channel inaudible

TASK 23-71-00-810-809-A
CAPT (F/O, 3rd OCCPT) Channel inaudible

1. Possible Causes

wiring
AMU [1RN]
CVR [1RK]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-71-00-710-001	Operational Test of the CVR and the CVR Channel Recording
ASM 237102
AMM 23-71-35-000-001	Removal of the Cockpit Voice Recorder (CVR) 1RK
AMM 23-71-35-400-001	Installation of the Cockpit Voice Recorder (CVR) 1RK

3. Fault Confirmation
Subtask 23-71-00-710-063-A

A. Test
(1) Do the operational test of CVR channel AMM 23-71-00-710-001.

4. Fault Isolation
Subtask 23-71-00-810-057-A

A. If there is confirmation of the fault:

NOTE: This fault isolation is applicable to the Captain station. Apply this fault isolation test to the others stations. Use the indications in parentheses.

(1) Replace and connect a new boomset.
(2) If the fault continues:
(a) Do a check and repair of the wiring of the CAPT (F/O, 3rd OCCPT) channel between the AMU [1RN] and the CVR [1RK] ASM 237102.
(3) If the fault continues:

Replace the CVR [1RK] AMM 23-71-35-000-001 AMM 23-71-35-400-001.

Subtask 23-71-00-810-060-A

B. If there is no confirmation of the fault:
(1) Replace the CVR [1RK] AMM 23-71-35-000-001 AMM 23-71-35-400-001.

Subtask 23-71-00-710-064-A

C. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:48 UTC