Removal of the Pylon Fire-Detector Ramp-Assembly

TASK 26-12-16-000-802-A
Removal of the Pylon Fire-Detector Ramp-Assembly

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: ALWAYS USE APPLICABLE GLOVES TO TOUCH HOT PARTS. HOT PARTS CAN CAUSE INJURY TO PERSONS.

ZONE: 415
ZONE: 425
FIN: 3WD1 ** ON A/C NOT FOR ALL
FIN: 3WD2 ** ON A/C NOT FOR ALL
FIN: 4WD1 ** ON A/C NOT FOR ALL
FIN: 4WD2 ** 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	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
415	LOWER PYLON
425	LOWER PYLON
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 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 36-11-49-000-824-A	Removal of the Environmental Control System (ECS) Interface Duct
TASK 36-11-53-000-802-A	Removal of the Overpressure Valve
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 75-25-49-000-802-A	Removal of the Turbine Cooling Air System
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Pylon Fire-Detectors Ramp-Assembly ** ON A/C NOT FOR ALL
Pylon Fire-Detectors Ramp-Assembly ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 26-12-16-861-052-A ** ON A/C NOT FOR ALL

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 26-12-16-941-052-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 26-12-16-865-058-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39

Subtask 26-12-16-010-060-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 26-12-16-040-055-A ** ON A/C NOT FOR ALL

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) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 26-12-16-010-061-A ** ON A/C NOT FOR ALL

F. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 26-12-16-020-054-A ** ON A/C NOT FOR ALL

G. Removal of the Components
(1) Remove the OPV (Ref. AMM TASK 36-11-53-000-802).
(2) Remove the Environment Control System (ECS) L-duct (Ref. AMM TASK 36-11-49-000-824).
(3) If necessary, remove the turbine cooling air-system-pipe (Ref. AMM TASK 75-25-49-000-802).

4. Procedure
Subtask 26-12-16-020-053-A ** ON A/C NOT FOR ALL

A. Removal 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.

(1) Turn the quarter-turn fasteners (11) by one quarter of a turn and open the clamps (10).
(2) Remove the two nuts (6) to disengage the two electrical connectors (7) from the two responders (5).
(3) Remove the two nuts (8) to disengage the two electrical connectors (9) from the two responders (5).
(4) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(5) Carefully disengage the four electrical cables (7) and (9) from the four clamps (10).
(6) Remove the screws (1) and the washers (2) from the ramp assembly (4).
(7) Carefully remove the ramp assembly (4) from the structure (3).

[Rev.10 from 2021] 2026.03.31 23:42:48 UTC