Installation of the Engine Fire-Detection Unit (FDU)

TASK 26-12-34-400-001-A
Installation of the Engine Fire-Detection Unit (FDU)

ZONE: 126
FIN: 2WD1
FIN: 2WD2

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

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
126	LATERAL AVIONIC COMPARTMENT
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 26-12-00-710-001-A	Operational Check of Loop/Squib
TASK 26-12-00-710-002-A	Operational Test of the Engine Fire and Overheat Detection with the Centralized Fault Display System (CFDS)
TASK 26-12-00-710-002-B	Operational Test of the Engine Fire and Overheat Detection with the Centralized Fault Display System (CFDS)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
Engine Fire-Detection Unit (FDU)

3. Job Set-up
Subtask 26-12-34-860-050-A

A. In the cockpit, on the ENG panel 115VU, make sure that the WARNING NOTICE(S) is in position to tell persons not to start the engines.

Subtask 26-12-34-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 2WD1 (FDUENG1)
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
FOR FIN: 2WD2 (FDUENG2)
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39

4. Procedure
Subtask 26-12-34-420-050-A

A. Install the Fire Detection Unit (FDU):
(1) Put the Fire Detection Unit (1) on its support (4).
(2) Install the washers (3), the screws (2) and tighten them.
(3) Remove the blanking caps from the electrical connectors (5) and (6).
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Connect the electrical connectors (5) and (6) to the Fire Detection Unit (1).

Subtask 26-12-34-865-052-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 2WD1 (FDUENG1)
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
FOR FIN: 2WD2 (FDUENG2)
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39

Subtask 26-12-34-860-051-A

C. Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).

Subtask 26-12-34-710-051-A

D. Do this test:
(1) On the upper ECAM DU, make sure that the FIRE ENG 1(2) DET FAULT message has gone out of view.
(2) Do an operational test of the engine fire and overheat detection with the Centralized Fault Display System (CFDS) (Ref. AMM TASK 26-12-00-710-002).
(3) Do an operational check of loop/squib (Ref. AMM TASK 26-12-00-710-001)

5. Close-up
Subtask 26-12-34-860-052-A

A. Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).

Subtask 26-12-34-410-050-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:43:24 UTC