Installation of the Core Fire Detectors

TASK 26-12-17-400-040-A
Installation of the Core Fire Detectors

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

FIN: 4001WD1 ** ON A/C NOT FOR ALL
FIN: 4001WD2 ** 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	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 10 and 8 lbf.in (0.11 and 0.09 m.daN )
No specific	Torque wrench: range to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )
No specific	Torque wrench: range to between 30 and 25 lbf.in (0.34 and 0.28 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
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 26-12-00-710-001-A	Operational Check of Loop/Squib
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
Core Fire Detector (4001WD1) - Left Side
Core Fire Detector (4001WD2) - Right Side

3. Job Set-up
Subtask 26-12-17-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU:
(a) Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
(b) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
(4) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).

Subtask 26-12-17-865-054-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
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38

Subtask 26-12-17-010-056-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 26-12-17-040-053-A ** ON A/C NOT FOR ALL

D. Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

4. Procedure
Subtask 26-12-17-420-052-A ** ON A/C NOT FOR ALL

A. Installation of the Core Fire Detectors

CAUTION: INSTALL THE FIRE DETECTORS AND THE RAIL AS ONE ASSEMBLY. THE FIRE DETECTOR SENSOR ELEMENTS CAN BE DAMAGED IF NOT SUPPORTED BY THE RAIL.

(1) Install the fire detector sensors on the engine brackets as follows:

NOTE: Install the fire detector sensors before you attach the rail assembly to the mounting brackets.

(a) Put the LH core loop A fire detector sensor (4001WD1) in position on the engine bracket and attach it with the bolts (30) and washers (35) (two locations).
(b) Put the RH core loop B fire detector sensor (4001WD2) in position on the engine bracket and attach it with the bolts (30) and washers (35) (three locations).
(c) TORQUE the bolts (30) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(2) Connect the rail assembly (50) to the engine brackets as follows:
(a) Make sure that the fire detector rail assembly (50) is in the correct position on the engine.
(b) Put the center mount clamps (55) in position on the mounting brackets (60).
(c) Turn the screw (65) on the center mount clamp (55) to attach the clamp to the bracket (60).
(d) TORQUE the screw on the center mount clamp (55) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(3) Install the core loop A fire detector harness on the LH fire detector sensor (4001WD1):
(a) Put the harness wire (25) on terminal C of the sensor (40) and attach it with the nut (20).
(b) TORQUE the nut (20) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(c) Put the harness wire (45) on terminal A of the sensor (40) and attach it with the nut (15).
(d) TORQUE the nut (15) to between 30 and 25 lbf.in (0.34 and 0.28 m.daN )

.
(e) Put the clamp (10) on the harness and attach it with the screws (5).
(f) TORQUE the screws (5) to between 10 and 8 lbf.in (0.11 and 0.09 m.daN )

.
(g) Lock the screws (5) with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.
(4) Install the core loop B fire detector harness on the RH fire detector sensor (4001WD2):
(a) Put the harness wire (25) on terminal C of the sensor (40) and attach it with the nut (20).
(b) TORQUE the nut (20) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(c) Put the harness wire (45) on terminal A of the sensor (40) and attach it with the nut (15).
(d) TORQUE the nut (15) to between 30 and 25 lbf.in (0.34 and 0.28 m.daN )

.
(e) Put the clamp (10) on the harness and attach it with the screws (5).
(f) TORQUE the screws (5) to between 10 and 8 lbf.in (0.11 and 0.09 m.daN )

.
(g) Lock the screws (5) with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.

Subtask 26-12-17-865-055-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
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38

Subtask 26-12-17-860-054-A ** ON A/C NOT FOR ALL

C. Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).

Subtask 26-12-17-710-052-A ** ON A/C NOT FOR ALL

D. Do this test.
(1) On the upper DU, make sure that the FIRE ENG1(2) LOOP A (B) FAULT message has gone out of view .
(2) Do an operational test of the engine fire detection system (Ref. AMM TASK 26-12-00-710-001).

5. Close-up
Subtask 26-12-17-860-055-A ** ON A/C NOT FOR ALL

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

Subtask 26-12-17-410-053-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) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 26-12-17-440-051-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 26-12-17-410-054-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 26-12-17-862-051-A ** ON A/C NOT FOR ALL

E. De-energize the ground service network (Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.03.31 23:42:59 UTC