Removal of the Pylon Lateral Access-Doors

TASK 54-51-21-000-802-A
Removal of the Pylon Lateral Access-Doors

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: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

ZONE: 410
ZONE: 420
FIN: 4020KM1 ** ON A/C NOT FOR ALL
FIN: 4020KM2 ** 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 3M (10 FT)- ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING
415AL, 415AR, 415BL, 415BR, 415CR, 425AL, 425AR, 425BL, 425BR, 425CR
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 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 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
Door Fairing Assembly
Pylon Lateral Access-Doors

3. Job Set-up
Subtask 54-51-21-941-052-A ** ON A/C NOT FOR ALL

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

Subtask 54-51-21-040-054-A ** ON A/C NOT FOR ALL

B. Deactivation of the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER IS LOCKED. IF NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO THE REVERSER.

(1) Make the thrust reverser unserviceable for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 54-51-21-010-052-A ** ON A/C NOT FOR ALL

C. 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) 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.
(3) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position:
(a) For the left pylon, in zone 415
(b) For the right pylon, in zone 425.

Subtask 54-51-21-020-055-B ** ON A/C NOT FOR ALL

D. Removal of the Components
(1) Removal of the Door Fairing Assembly that is installed on access doors 415BR and 425BR:

Door Fairing Assembly ** ON A/C NOT FOR ALL

(a) Hold the door fairing assembly (18).
(b) Remove the screws (19) and (20).
(c) Remove the door fairing assembly (18).

4. Procedure
Subtask 54-51-21-020-052-B ** ON A/C NOT FOR ALL

A. Removal of the Pylon Lateral Access-Doors

Pylon Lateral Access-Doors ** ON A/C NOT FOR ALL

(1) Removal of the pylon lateral access-doors 415AL 415AR 425AL and 425AR:
(a) Hold the access doors (3).
(b) Remove the screws (1) and (2).
(c) Remove the access doors (3).
(d) Hold the access doors (11).
(e) Remove the screws (12).
(f) Remove the access doors (11).
(2) Removal of the pylon lateral access-doors 415BR and 425BR:
(a) Hold the access doors (10).
(b) Remove the screws (9).
(c) Remove the access doors (10).
(3) Removal of the pylon lateral access-doors 415BL 415CR 425BL and 425CR:
(a) Hold the access doors (5).
(b) Remove the screws (4).
(c) Remove the access doors (5).
(d) Hold the access doors (6).
(e) Remove the screws (7) and (8).
(f) Remove the access doors (6).

[Rev.10 from 2021] 2026.04.01 03:51:08 UTC