Removal of the Forward Centerbody Assembly [PW11]

TASK 78-11-02-000-801-A
Removal of the Forward Centerbody 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: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

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 2M (6 FT) - ADJUSTABLE
No specific	AR	COVER - PROTECTION
636-4000-22GSE	1	EXHAUST DOLLY

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 78-11-03-000-801-A	Removal of the Aft Centerbody Assembly
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
Forward Centerbody Assembly
Exhaust Dolly

3. Job Set-up
Subtask 78-11-02-941-050-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 78-11-02-010-052-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

Subtask 78-11-02-040-050-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 maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 78-11-02-010-053-A ** ON A/C NOT FOR ALL

D. Get Access
(1) If necessary, put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 78-11-02-010-050-A ** ON A/C NOT FOR ALL

E. Remove the aft centerbody assembly (Ref. AMM TASK 78-11-03-000-801).

4. Procedure
Subtask 78-11-02-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Forward Centerbody Assembly

WARNING: MAKE SURE THAT THE FORWARD CENTERBODY IS SUFFICIENTLY SUPPORTED DURING REMOVAL OR INSTALLATION. THE FORWARD CENTERBODY WEIGHS APPROXIMATELY 12.0 LB (5.44 KG). IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY TO PERSONNEL AND/OR DAMAGE TO THE COMPONENTS CAN OCCUR.

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Remove the 20 bolts (1), the 20 washers (3) and the 20 nuts (4) that attach the forward centerbody assembly (2) to the turbine exhaust case.
(2) Remove the forward centerbody assembly (2).
(3) Put the forward centerbody assembly (2) on the 636-4000-22GSE EXHAUST DOLLY. Refer to the instructions of the manufacturer.
(4) Installation of the protection covers:

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install the COVER - PROTECTION as necessary to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 03:30:29 UTC