Installation of the Core Engine Fire Detection Elements with the Rail

TASK 26-12-17-400-805-A
Installation of the Core Engine Fire Detection Elements with the Rail

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 450
ZONE: 460
FIN: 4001WD1
FIN: 4001WD2

1. Reason for the Job
Two persons are necessary to do this task
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.34 and 0.28 m.daN (30.09 and 24.78 lbf.in )
No specific	Torque wrench: range to between 0.51 and 0.45 m.daN (45.13 and 39.82 lbf.in )
No specific	Torque wrench: range to between 0.62 and 0.56 m.daN (54.87 and 49.56 lbf.in )
No specific	Torque wrench: range to between 0.79 and 0.68 m.daN (69.91 and 60.18 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
450	ENG 1 THRUST REVERSER & EXHAUST SECTION
460	ENG 2 THRUST REVERSER & EXHAUST SECTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, 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 26-12-17-400-804-A	Installation of the Core Engine Fire Detection Elements
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Core Engine Fire Detection Elements with the Rail

3. Job Set-up
Subtask 26-12-17-861-070-A

A. Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).

Subtask 26-12-17-941-066-A

B. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 26-12-17-865-079-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39

Subtask 26-12-17-010-092-A

D. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 26-12-17-040-071-A

E. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 26-12-17-010-093-A

F. Get Access
(1) Make sure that the thrust reverser cowl-doors are open (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR
(2) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position.

4. Procedure
Subtask 26-12-17-420-066-A

A. Installation of the Core Engine Fire Detection Elements with the Rail
(1) Lubricate the threads of the bolts (6) and the screws (27) with engine oil (Material No.CP2442) .
(2) Before you install the left fire detection element rail (3) and the right fire detection element rail (22), examine the assembly as follows:
(a) Make sure that the fire loop and responders (2) are correctly installed on the left and right fire detection element rails (3) and (22) (Ref. AMM TASK 26-12-17-400-804).
(b) Make sure that the bolt (17) and nut (18) that connect the left and right rails (3) and (22) are installed but not tightened. This connection is a joint that moves to permit installation of the left and right rails.
(c) Make sure that the 15 loop clamps (5) are installed in the correct position around the left and right rails (3) and (22). Use the record made during the disassembly to get the correct positions.
(3) Use two mechanics to carefully put the core engine fire detection elements in position on the engine. Align the tabs of the loop clamps (5) with the mating engine brackets (4), (7), (8), (9), (10), (11), (12), (13), (14), (15), (16), (19), (20), (21) and (23).

NOTE: During installation of the left fire detection element rail, a potential clash exists between the rail and an EBU duct. It may be necessary for a mechanic to clamp the duct by hand to prevent the clash.

(4) Install and hand-tighten the 15 bolts (6) to attach the loop clamps (5) to the engine.
(5) TORQUE the 15 bolts (6) at each of the 15 loop clamps (5) to between 0.79 and 0.68 m.daN (69.91 and 60.18 lbf.in )

.
(6) TORQUE the nut (18) at the joint between the left and right rails (3) and (22) to between 0.79 and 0.68 m.daN (69.91 and 60.18 lbf.in )

.
(7) On the left side of the engine, connect the harness (1) to the left fire detection element rail (3) as follows:
(a) Put the harness (1) in position and put the two ring connectors on the two studs of the responder (2).

NOTE: The larger ring is installed on the larger stud and the smaller ring is installed on the smaller stud. The different sizes are necessary to make sure that the electrical polarity is correct.

(b) Install the two nuts (24) and (25) on the two studs of the responder (2).
(8) On the right side of the engine, connect the harness (1) to the right fire detection element rail (22) as follows:
(a) Put the harness (1) in position and put the two ring connectors on the two studs of the responder (2).

NOTE: The larger ring is installed on the larger stud and the smaller ring is installed on the smaller stud. The different sizes are necessary to make sure that the electrical polarity is correct.

(b) Install the two nuts (24) and (25) on the two studs of the responder (2).
(9) On the left side and on the right side of the engine, complete the connection of the harness (1) to the responders (2) as follows:
(a) TORQUE the larger nuts (24) to between 0.62 and 0.56 m.daN (54.87 and 49.56 lbf.in )

.
(b) TORQUE the smaller nuts (25) to between 0.51 and 0.45 m.daN (45.13 and 39.82 lbf.in )

.
(c) Install the screws (27) and the retainers (26) to attach the left and right harnesses (1) to the responders (2).
(d) TORQUE the screws (27) to between 0.34 and 0.28 m.daN (30.09 and 24.78 lbf.in )

Subtask 26-12-17-865-080-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
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 26-12-17-860-080-A

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

Subtask 26-12-17-710-061-A

D. Do this test:
(1) On the upper ECAM DU, make sure that the FIRE ENG1(2) LOOP A (B) FAULT message is out of view.
(2) Do an operational check of loop/squib (Ref. AMM TASK 26-12-00-710-001).

5. Close-up
Subtask 26-12-17-860-079-A

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

Subtask 26-12-17-410-070-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 26-12-17-440-057-A

C. Do the reactivation of the thrust reverser after maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 26-12-17-410-071-A

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

Subtask 26-12-17-862-063-A

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

[Rev.10 from 2021] 2026.03.31 23:43:20 UTC