Removal of the Engine Fire-Detection Unit (FDU)

TASK 26-12-34-000-001-A
Removal 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	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
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
Engine Fire-Detection Unit (FDU)

3. Job Set-up
Subtask 26-12-34-941-050-A

A. Safety Precautions
(1) In the cockpit, on the ENG panel 115VU, put a WARNING NOTICE(S) to tell the persons not to start the engine .

Subtask 26-12-34-865-050-A

B. Open, safety and tag 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 26-12-34-010-050-A

C. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(2) Open the access door 824.

4. Procedure
Subtask 26-12-34-020-050-A

A. Remove the Fire Detection Unit (FDU):
(1) Disconnect the electrical connectors (5) and (6) from the Fire Detection Unit (1).
(2) Put CAP - BLANKING on the electrical connectors (5) and (6).
(3) Remove the screws (2) and the washers (3).
(4) Remove the fire detection unit (1).

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