Cockpit Voice Recording Inoperative

TASK 23-71-00-810-804-A
Cockpit Voice Recording Inoperative

1. Possible Causes

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 23-71-13-000-001	Removal of the CVR Microphone
AMM 23-71-13-400-001	Installation of the CVR Microphone
AMM 23-71-14-000-001	Removal of the CVR Microphone Amplifier
AMM 23-71-14-400-001	Installation of the CVR Microphone Amplifier
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 23-71-00-710-056-A

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

4. Fault Isolation
Subtask 23-71-00-810-053-A ** ON A/C NOT FOR ALL

A. If during the operational test the CVR microphone is inoperative:

(1) If the fault continues:

(2) If the fault continues:

(3) If the fault continues:

do a check and repair the wiring of the amplifier (18RK) and of the microphone (16RK) ASM 237102.

Subtask 23-71-00-810-053-B ** ON A/C NOT FOR ALL

A. If during the operational test the CVR microphone is inoperative:

(1) If the fault continues:

replace the MIC-PREAMPLI INTEGRATED, CVR [17RK] AMM 23-71-13-000-001 and AMM 23-71-13-400-001.

(2) If the fault continues:

do a check and repair the wiring of the MIC-PREAMPLI INTEGRATED, CVR [17RK] and the CVR [1RK] ASM 237102.

Subtask 23-71-00-710-057-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:47 UTC