Installation of the APU Fire-Detection Unit (FDU)

TASK 26-13-34-400-001-A
Installation of the APU Fire-Detection Unit (FDU)

ZONE: 127
FIN: 13WG

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	CAP - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
127	REAR AVIONIC COMPARTMENT
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 26-13-00-710-001-A	Operational Test of the APU Fire and Overheat Detection System
TASK 31-32-00-860-005-A	Procedure to Get Access to the SYSTEM REPORT/TEST FIRE PROT Page
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
APU Fire-Detection Unit

3. Job Set-up
Subtask 26-13-34-860-050-A

A. In the cockpit, on the OVERHEAD CTL & IND panel 25VU, make sure that the WARNING NOTICE(S) is in position to tell persons not to start the APU.

Subtask 26-13-34-010-051-A

B. Get Access
(1) Make sure that ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
(2) Make sure that the access door 824 is open.

Subtask 26-13-34-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/FIRE AND OVHT/DET/LOOP B	2WG	L44
121VU	APU/FIRE AND OVHT/DET/LOOP A	1WG	L43

4. Procedure
Subtask 26-13-34-420-050-A

A. Install the APU 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 CAP - BLANKING from the electrical connectors (5) and (6).
(4) Connect the electrical connectors (5) and (6) to the fire detection unit (1).

Subtask 26-13-34-865-052-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
121VU	APU/FIRE AND OVHT/DET/LOOP B	2WG	L44
121VU	APU/FIRE AND OVHT/DET/LOOP A	1WG	L43

Subtask 26-13-34-860-051-A

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

Subtask 26-13-34-710-050-A

D. On the upper ECAM DU, make sure that the FIRE APU DET FAULT message has gone out of view.

Subtask 26-13-34-710-051-A

E. Operational Test of the Engine Fire and Overheat Detection with the CFDS
(1) On one Multipurpose Control and Display Unit (MCDU), get the SYSTEM REPORT/TEST/FIRE PROT page (Ref. AMM TASK 31-32-00-860-005).
(2) Do this test:

ACTION	RESULT
1.On the MCDU:	On the MCDU:
push the line key adjacent to the FDU APU indication.	the FDU APU page comes into view.
push the line key adjacent to the TEST indication.	On the FDU APU page: the TEST WAIT message comes into view for 60 seconds then goes out of view, and these messages come into view (P/N given for example only): TEST OK P/N 7304 01 02 END OF TEST NOTE: Ignore other indications.

(3) Do the operational test of the APU fire and overheat detection system (Ref. AMM TASK 26-13-00-710-001).

5. Close-up
Subtask 26-13-34-860-052-A

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

Subtask 26-13-34-410-050-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 23:43:41 UTC