Removal of the Cockpit Voice Recorder (CVR)

TASK 23-71-35-000-001-A
Removal of the Cockpit Voice Recorder (CVR)

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

WARNING: PUT WARNING NOTICES IN THE COCKPIT TO TELL PERSONS NOT TO OPERATE THE FLIGHT CONTROLS. THE MOVEMENT OF THE TRIMMABLE HORIZONTAL STABILIZER (THS) CAN CAUSE INJURY TO PERSONS.

ZONE: 312
FIN: 1RK ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
312	AFT FUSLG TAIL SECTION
312AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 31-39-33-000-801-A	Removal of the Cockpit Voice and Data Recorder (CVDR) and the Umbrella Panels
Solid State Cockpit Voice Recorder (SSCVR) ** ON A/C NOT FOR ALL
Solid State Cockpit Voice Recorder (SSCVR) ** ON A/C NOT FOR ALL

3. Job Set-up

NOTE: The procedure is valid for the Cockpit Voice Recorder (CVR) and Solid State Cockpit Voice Recorder (SSCVR).

Subtask 23-71-35-861-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 23-71-35-861-050-B ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) No special job set-up is necessary for this task.

Subtask 23-71-35-865-055-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/CVR/SPLY	2RK	E14
** ON A/C NOT FOR ALL
49VU	COM/CVR/SPLY	23RK	E14
** ON A/C NOT FOR ALL
49VU	RCDR1 CVR&FDR	40TU	E14

Subtask 23-71-35-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at zone 312.
(2) Open access door 312AR.

4. Procedure
Subtask 23-71-35-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Cockpit Voice Recorder (CVR)

Solid State Cockpit Voice Recorder (SSCVR) ** ON A/C NOT FOR ALL

(1) Loosen the knurled nuts (4) and lower the fasteners.
(2) Carefully remove the CVR (1) from the rack (2).
(3) Make sure that you do not damage the pins of the electrical connectors (3).
(4) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

Subtask 23-71-35-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the Cockpit Voice Recorder (CVR) (Ref. AMM TASK 31-39-33-000-801).

[Rev.10 from 2021] 2026.04.01 04:23:51 UTC