Removal of the Thrust-Reverser Cowl Fitting at RIB4

TASK 54-57-17-000-804-A
Removal of the Thrust-Reverser Cowl Fitting at RIB4

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, 415BR, 425AL, 425BR
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 54-51-21-000-802-A	Removal of the Pylon Lateral Access-Doors
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
Thrust-Reverser Cowl Fitting at RIB4
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
TASK 78-32-01-000-802-A	Removal of the Left Thrust Reverser Half - Engine 1
TASK 78-32-02-000-802-A	Removal of the Right Thrust Reverser Half - Engine 1
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
TASK 78-32-01-000-803-A	Removal of the Left Thrust Reverser Half - Engine 2
TASK 78-32-02-000-803-A	Removal of the Right Thrust Reverser Half - Engine 2

3. Job Set-up
Subtask 54-57-17-941-059-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 54-57-17-040-055-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 54-57-17-010-059-A ** ON A/C NOT FOR ALL

C. Get Access
(1) 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.
(2) Remove the thrust reversers:
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL and 452AR (Ref. AMM TASK 78-32-01-000-802) and (Ref. AMM TASK 78-32-02-000-802)
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL and 462AR (Ref. AMM TASK 78-32-01-000-803) and (Ref. AMM TASK 78-32-02-000-803).
(3) Remove the pylon lateral access-doors (Ref. AMM TASK 54-51-21-000-802):
(a) For the left pylon: 415AL 415BR
(b) For the right pylon: 425AL 425BR.

4. Procedure
Subtask 54-57-17-020-062-A ** ON A/C NOT FOR ALL

A. Removal of the Thrust-Reverser Cowl Fitting at RIB4

Thrust-Reverser Cowl Fitting at RIB4 ** ON A/C NOT FOR ALL

(1) Loosen the nuts (2).
(2) Remove the nuts (2) and the washers (3).
(3) Remove the bolts (6) and the washers (5).
(4) Remove the thrust-reverser cowl fitting (1) and the shim (4).

NOTE: Record the position of the shim (4) and the location and thickness of the peel shim installed on the shim (4).
Do this to put the shim (4) at the same position at the installation.

[Rev.10 from 2021] 2026.04.01 02:03:47 UTC