Installation of the Pylon Fire-Detector Ramp-Assembly

TASK 26-12-16-400-804-A
Installation of the Pylon Fire-Detector Ramp-Assembly

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: YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.

ZONE: 415
ZONE: 425
FIN: 3WD1
FIN: 3WD2
FIN: 4WD1
FIN: 4WD2

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	1	CLOTH - PROTECTIVE
No specific	1	FLASHLIGHT
No specific	1	MIRROR - INSPECTION
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.28 and 0.23 m.daN (24.78 and 20.35 lbf.in )
No specific	Torque wrench: range to between 0.40 and 0.34 m.daN (35.40 and 30.09 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
415	LOWER PYLON
425	LOWER PYLON
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

C. 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 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 71-52-43-000-803-A	Removal of the Electrical Harness from the Pylon to the Core Fire Detector Elements
TASK 71-52-43-000-804-A	Removal of the Electrical Harness from the Pylon to the Environmental Control System (ECS) Valves
TASK 71-52-43-400-803-A	Installation of the Electrical Harness from the Pylon to the Core Fire Detector Elements
TASK 71-52-43-400-804-A	Installation of the Electrical Harness from the Pylon to the Environmental Control System (ECS) Valves
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
Pylon Fire-Detector Ramp-Assembly

3. Job Set-up
Subtask 26-12-16-861-057-A

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

Subtask 26-12-16-860-065-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 26-12-16-865-065-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 26-12-16-010-072-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 26-12-16-040-060-A

E. Deactivation of the Thrust Reverser 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 the thrust reverser system is deactivated for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 26-12-16-010-073-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 an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.

Subtask 26-12-16-020-064-A

G. Removal of the Components
(1) Make sure that the electrical connectors are disconnected:
(a) For electrical harnesses 4204KS and 4205KS (Ref. AMM TASK 71-52-43-000-803).
(b) For electrical harness 4228KS (Ref. AMM TASK 71-52-43-000-804).

4. Procedure
Subtask 26-12-16-420-063-B

A. Installation of the Pylon Fire-Detector Ramp-Assembly

CAUTION: DO NOT USE ELECTRICAL OR PNEUMATIC TOOLS TO LOOSEN OR TIGHTEN THE QUARTER-TURN FASTENER ON THE FIRE DETECTOR CLAMP. ONLY USE A MANUAL SCREWDRIVER. ELECTRICAL OR PNEUMATIC TOOLS WILL CAUSE THE FASTENER TO TURN TOO MUCH AND POSSIBLY TO BREAK.

CAUTION: DO NOT BEND THE MANIFOLD OF THE SENSING ELEMENT. IF YOU BEND IT, YOU CAN CAUSE DAMAGE TO THE WELDING.

(1) Put a CLOTH - PROTECTIVE below the work area to help you to find the fasteners if they fall.
(2) If necessary, use a FLASHLIGHT and an MIRROR - INSPECTION.
(3) Carefully put the ramp assembly (4) in position on the right side of the pylon (3).
(4) Make sure that clamps are open.
(5) Make sure that the electrical cables from the pylon lower spar are correctly installed on the metal jaws of the clamps.
(6) Install the washers (2) and the bolts (1) on the ramp assembly (4).
(7) Tighten the bolts (1).
(8) Remove the blanking caps from the two responders (5).
(9) Remove the CAP-BLANKING from each electrical connector and receptacle.
(10) Make sure that all the electrical connections are clean and in the correct condition.
(11) Put the four electrical cables (6) and (7) in position on the two responders (5) and the eight clamps (10) and (11).
(a) Install the four nuts (8) and (9) on the two responders (5).
1 TORQUE the two nuts (8) to between 0.40 and 0.34 m.daN (35.40 and 30.09 lbf.in )

.
2 TORQUE the two nuts (9) to between 0.28 and 0.23 m.daN (24.78 and 20.35 lbf.in )

.
(b) Close the eight clamps (10) and (11).
1 Make sure that the electrical cables are correctly installed on the metal jaws of the clamps.
2 Close the eight clamps (10) and (11) and turn the related quarter-turn fasteners (12) by one quarter of a turn.

Subtask 26-12-16-420-064-A

B. Connect the electrical connectors of the pylon:
(1) For electrical harness 4204KS and 4205KS (Ref. AMM TASK 71-52-43-400-803).
(2) For electrical harness 4228KS (Ref. AMM TASK 71-52-43-400-804).

Subtask 26-12-16-865-066-A

C. 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: 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 26-12-16-860-066-A

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

Subtask 26-12-16-710-055-A

E. Do this test.
(1) On the upper ECAM DU, make sure that the FIRE ENG1(2) LOOP A (B) FAULT message is not shown.
(2) Do an operational test of the engine-fire detection system (Ref. AMM TASK 26-12-00-710-001).

Subtask 26-12-16-860-067-A

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

5. Close-up
Subtask 26-12-16-410-063-A

A. 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 26-12-16-440-055-A

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

Subtask 26-12-16-410-064-A

C. 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 access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 26-12-16-862-053-A

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

[Rev.10 from 2021] 2026.03.31 23:42:55 UTC