Installation of the Cockpit Voice Recorder (CVR) Rack

TASK 23-71-35-400-002-A
Installation of the Cockpit Voice Recorder (CVR) Rack

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

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

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

B. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 20-28-00-912-803-A	Bonding Surface Preparation
TASK 23-71-35-000-001-A	Removal of the Cockpit Voice Recorder (CVR)
TASK 23-71-35-400-001-A	Installation of the Cockpit Voice Recorder (CVR)
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 23-71-00-00	COCKPIT VOICE RECORDER (CVR) - DESCRIPTION AND OPERATION
Cockpit Voice Recorder (CVR) Rack ** ON A/C NOT FOR ALL
Cockpit Voice Recorder (CVR) Rack ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 23-71-35-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) For the location of this component refer to the (Ref. AMM D/O 23-71-00-00).
(3) Make sure that the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position at zone 312.
(4) Make sure that access door 312AR is open.
(5) Make sure that the CVR is removed (Ref. AMM TASK 23-71-35-000-001).

4. Procedure
Subtask 23-71-35-420-052-A ** ON A/C NOT FOR ALL

A. Installation of the Cockpit-Voice-Recorder (CVR) Rack
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) For the CVR rack with part number S4416F01:
(a) Prepare for the bonding (Ref. AMM TASK 20-28-00-912-802).
(b) Put the CVR rack (19) in its installation position and install the washers (16),the screws (15) and the nuts (17).
(c) Tighten the screws (15).
(d) Complete the bonding procedure (Ref. AMM TASK 20-28-00-912-802).
(e) Remove the CAP-BLANKING from each electrical connector and receptacle.
(f) Make sure that all the electrical connections are clean and in the correct condition.
(g) Put the electrical connector (18) in position on the CVR rack (19) and install the screws (12), the washers (13) and the nuts (14).
(h) Tighten the screws (12).
(5) For the other types of the CVR rack:
(a) Prepare for the bonding (Ref. AMM TASK 20-28-00-912-802).
(b) Put the bonding straps (7) and the dampers (1) in their installation positions and install the screws (2), the washers (3) and the nuts (4).
(c) Tighten the screws (2).
(d) Put the bonding straps (7) and the CVR Rack (5) in position and install the screws (8).
(e) Complete the bonding procedure (Ref. AMM TASK 20-28-00-912-802).
(f) Remove the CAP-BLANKING from each electrical connector and receptacle.
(g) Put the electrical connector (6) in position on the CVR Rack (5) and install the screws (9), the washers (10) and the nuts (11).
(h) Tighten the screws (9).

Subtask 23-71-35-420-052-B ** ON A/C NOT FOR ALL

A. Installation of the CVR Rack
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
(5) Put the CVR rack (8) in its installation position and install the washers (5), the screws (4) and the nuts (6).
(6) Tighten the screws (4).
(7) Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
(8) Remove the CAP-BLANKING from each electrical connector and receptacle.
(9) Make sure that all the electrical connections are clean and in the correct condition.
(10) Put the electrical connector (7) in position on the CVR rack (8) and install the screws (1), the washers (2) and the nuts (3).
(11) Tighten the screws (1).

5. Close-up
Subtask 23-71-35-410-053-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Install the CVR (Ref. AMM TASK 23-71-35-400-001).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close access door 312AR.
(4) Remove the access platform(s).

Subtask 23-71-35-860-052-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 06:12:19 UTC