Installation of the Digital Flight Data Recorder (DFDR)

TASK 31-33-55-400-002-A
Installation of the Digital Flight Data Recorder (DFDR)

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: 1TU ** 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 5M (16 FT)- ADJUSTABLE
No specific	1	WARNING NOTICE(S)

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 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-33-00-710-007-A	Operational Test of the DFDR
TASK 31-33-00-710-007-C	Operational Test of the DFDR
Removal/Installation of the DFDR ** ON A/C NOT FOR ALL
Removal/Installation of the DFDR ** ON A/C NOT FOR ALL
Removal/Installation of the DFDR ** ON A/C NOT FOR ALL

3. Job Set-up

NOTE: The Procedure is valid for the Digital Flight Data Recorder (DFDR) and Solid State Flight Data Recorder (SSFDR).

Subtask 31-33-55-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the WARNING NOTICE(S) are in position in the cockpit to tell persons not to operate the flight controls.
(3) Make sure that the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE is in position at access door 312AR.
(4) Make sure that access door 312AR is open.
(5) Make sure that light switch 3LJ is set to the ON position.

Subtask 31-33-55-865-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	RCDR/DFDR	7TU	K16

4. Procedure
Subtask 31-33-55-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the DFDR

Removal/Installation of the DFDR ** ON A/C NOT FOR ALL

(1) Make sure that the underwater locator beacon is correctly installed.
(2) Clean the component interfaces and the adjacent area.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Remove the blanking caps from the electrical connector(s) (5).
(5) Install carefully the DFDR (1) into the mounting tray (4).
(6) Make sure that the DFDR is correctly aligned to prevent damage to the electrical connection.
(7) Put the knurled nuts (3) in position at the attach tabs (2) and tighten them.

Subtask 31-33-55-865-052-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	RCDR/DFDR	7TU	K16

5. Close-up
Subtask 31-33-55-710-050-A ** ON A/C NOT FOR ALL

A. Operational Test
(1) Do the operational test of the Digital Flight Data Recorder (DFDR) (Ref. AMM TASK 31-33-00-710-007).

Subtask 31-33-55-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Set light switch 3LJ to the OFF position.
(3) Close access door 312AR.
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

Subtask 31-33-55-862-051-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:35:07 UTC