Installation of the Forward Centerbody Assembly [PW11]

TASK 78-11-02-400-801-A
Installation 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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	1	WRENCH - STANDARD
No specific	1	WRENCH - TORQUE
No specific	Torque wrench: range to between 130 and 125 lbf.in (1.47 and 1.41 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU3-0025)	sealant, tamper proof
(Material No.PU5-0003)	anti-seize compound

C. 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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	BOLT	AIPC 78-11-86-10-030
4	NUT	AIPC 78-11-86-10-070

E. 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 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-11-03-000-801-A	Removal of the Aft Centerbody Assembly
TASK 78-11-03-400-801-A	Installation of the Aft Centerbody Assembly
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
Forward Centerbody Assembly
Exhaust Dolly

3. Job Set-up
Subtask 78-11-02-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833)

Subtask 78-11-02-010-054-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (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 78-11-02-040-051-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser System 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) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 78-11-02-010-055-A ** ON A/C NOT FOR ALL

D. Get Access
(1) If necessary, install the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE.

Subtask 78-11-02-010-056-A ** ON A/C NOT FOR ALL

E. Make sure that the aft centerbody assembly is removed (Ref. AMM TASK 78-11-03-000-801).

4. Procedure
Subtask 78-11-02-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Forward Centerbody Assembly

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

(1) Removal of the protection covers:

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine.
(2) Remove the forward centerbody assembly (2) from the 636-4000-22GSE EXHAUST DOLLY. Refer to the instructions of the manufacturer.
(3) Apply a anti-seize compound (Material No.PU5-0003) to the shanks and threads of the bolts (1).

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.

(4) Put the forward centerbody assembly (2) on the turbine exhaust case.
(a) Make sure that the alignment pins on the turbine exhaust case insert into the holes on the forward centerbody assembly (2).
(5) Loosely install the forward centerbody assembly (2) on the turbine exhaust case with the 20 bolts (1), the 20 washers (3) and the 20 nuts (4).
(a) Do not torque the nuts (4) at this time.
(6) Installation of the 20 bolts (1) and the 20 nuts (4):
(a) Hold the bolts (1) with a WRENCH - STANDARD.
(b) Engage each nut (4) until one bolt thread protrudes from the top of the nut (4).
(c) Turn each nut (4) a small distance with a WRENCH - TORQUE.
(d) Measure the maximum torque to turn each nut. If the torque is less than 3.5 lbf.in (0.04 m.daN), replace the nut (4) and the related bolt (1).
(e) Repeat steps 4.A.(6)(a) thru 4.A.(6)(d) with the new AIPC 78-11-86-10-070 NUT (4) and AIPC 78-11-86-10-030 BOLT (1).
(7) TORQUE the 20 nuts (4) in opposite pairs to between 130 and 125 lbf.in (1.47 and 1.41 m.daN )

.
(a) As an alternative, you can hold the nut (4) with the WRENCH - STANDARD and TORQUE the bolt (1) to between 130 and 125 lbf.in (1.47 and 1.41 m.daN )

.
(8) Paint torque stripes on the 20 nuts (4) and the adjacent surfaces with a PU3-0025sealant, tamper proof.

5. Close-up
Subtask 78-11-02-410-050-A ** ON A/C NOT FOR ALL

A. Install the aft centerbody assembly (Ref. AMM TASK 78-11-03-400-801).

Subtask 78-11-02-410-051-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).

Subtask 78-11-02-440-050-A ** ON A/C NOT FOR ALL

C. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 78-11-02-410-052-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

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