Removal of the Pylon Lateral Access-Doors

TASK 54-51-21-000-001-A
Removal of the Pylon Lateral Access-Doors

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

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)
No specific	AR	WARNING NOTICE(S)

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, 425AL, 425AR, 425BL, 425BR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
Pylon Lateral Access-Doors ** ON A/C NOT FOR ALL
Pylon Lateral Access-Doors ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 54-51-21-861-050-A ** ON A/C NOT FOR ALL

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

Subtask 54-51-21-941-050-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put the WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 54-51-21-040-050-A ** ON A/C NOT FOR ALL

C. 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 78-30-00-481-041).

Subtask 54-51-21-040-050-B ** ON A/C NOT FOR ALL

C. 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 78-30-00-040-012).

Subtask 54-51-21-040-050-C ** ON A/C NOT FOR ALL

C. 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 78-30-00-481-041).

Subtask 54-51-21-010-050-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) in position:
(a) At zone 410 for the left pylon
(b) At zone 420 for the right pylon.

4. Procedure
Subtask 54-51-21-020-050-A ** 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) Remove pylon lateral access-door 415BL:

NOTE: The procedure is the same for pylon lateral access-doors 415BR, 425BL and 425BR.

(a) Hold the pylon lateral access-door (1) and remove the screws (3), the washers (2) and the pylon lateral access-door (1).
(2) Remove pylon lateral access-door 415AL:

NOTE: The procedure is the same for pylon lateral access-doors 415AR, 425AL and 425AR.

(a) Hold the pylon lateral access-door (5) and remove the screws (4) and the pylon lateral access-door (5).

Subtask 54-51-21-020-050-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) Remove pylon lateral access-door 415BL:

NOTE: The procedure is the same for pylon lateral access-doors 415BR, 425BL and 425BR.

(a) Hold the pylon lateral access-door (3) and remove the screws (1) and the washers (2).
(b) Remove the spring pin (5), the captive screw (6), the washer (4) and the pylon lateral access-door (3).
(2) Remove pylon lateral access-door 415AL:

NOTE: The procedure is the same for pylon lateral access-doors 415AR, 425AL and 425AR.

(a) Hold the pylon lateral access-door (8) and remove the screws (7) and the pylon lateral access-door (8).

[Rev.10 from 2021] 2026.04.01 02:01:02 UTC