Removal of the Thrust Reverser Door Opening System (DOS) Actuator [PW11]

TASK 78-36-02-000-801-A
Removal of the Thrust Reverser Door Opening System (DOS) Actuator

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

ZONE: 400

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 1M(3 FT)
636-3000-25GSE	1	TR DOS INSTALL TOOL

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR

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
Thrust Reverser Door Opening System (DOS) Actuator
Thrust Reverser DOS Installation Tool

3. Job Set-up
Subtask 78-36-02-941-050-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 78-36-02-010-050-A ** ON A/C NOT FOR ALL

B. 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 1M(3 FT) in position.

Subtask 78-36-02-040-050-A ** ON A/C NOT FOR ALL

C. 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 ground maintenance (Ref. AMM TASK 78-30-00-040-805).

4. Procedure
Subtask 78-36-02-480-050-A ** ON A/C NOT FOR ALL

A. Installation of the 636-3000-25GSE TR DOS INSTALL TOOL
(1) Attach the 636-3000-25GSE TR DOS INSTALL TOOL to the DOS actuator (1).
(2) Use 636-3000-25GSE TR DOS INSTALL TOOL to compress the DOS actuator (1) until the DOS rod ends line up with brackets on the torque box and fan case. Refer to the instructions of the manufacturer.

Subtask 78-36-02-020-050-A ** ON A/C NOT FOR ALL

B. Removal of the Door Opening System (DOS) Actuator (1)

NOTE: This procedure is for the left side. The right side is opposite.

(1) Remove the bolt (3), washer (5), bushing (4) and nut (6) that attach the actuator (1) to the thrust reverser.
(2) Remove the bolt (3), washer (5), bushing (4) and nut (6) that attach the actuator (1) to the engine fan case.
(3) Remove the six bolts (7) and the six washers (8) to remove the fitting (2) from the engine case, as necessary.
(4) Remove the thrust reverser DOS installation tool from the DOS actuator (1). Refer to the instructions of the manufacturer.

Subtask 78-36-02-080-050-A ** ON A/C NOT FOR ALL

C. Removal of the 636-3000-25GSE TR DOS INSTALL TOOL
(1) Remove the 636-3000-25GSE TR DOS INSTALL TOOL from the DOS actuator (1). Refer to the instructions of the manufacturer.

[Rev.10 from 2021] 2026.04.01 03:34:05 UTC