Replacement of the Helical Coil Insert(s) on the Angle Gearbox (AGB) [PW11]

TASK 72-62-01-920-801-A
Replacement of the Helical Coil Insert(s) on the Angle Gearbox (AGB)

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.

ZONE: 400

1. Reason for the Job
Use this procedure to repair the loose or the damaged helical coil insert(s) on the AGB.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL

B. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	INSERT OPTION	EIPC 72-62-01-01-000

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-24-00-910-803-A	SPOP 415 - Installation of Helical Coil Threaded Inserts
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 72-61-01-000-801-A	Removal of the Main Gear Box (MGB)
TASK 72-61-01-400-801-A	Installation of the Main Gear Box (MGB)
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
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Replacement of the Helical Coil Insert(s) on the AGB

3. Job Set-up
Subtask 72-62-01-941-052-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 72-62-01-010-054-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 72-62-01-040-052-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Ground 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).

Subtask 72-62-01-010-055-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL.

4. Procedure

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

Subtask 72-62-01-920-050-A ** ON A/C NOT FOR ALL

A. Replacement of the Helical Coil Insert(s) on the AGB

CAUTION: THIS AIRCRAFT MAINTENANCE MANUAL REPAIR LETS YOU REPLACE ONLY THE ORIGINAL EQUIPMENT MANUFACTURER'S HELICAL COIL INSERT(S). IF THERE IS DAMAGE TO THE HOLE(S) AND AN OVERSIZED INSERT IS NECESSARY, THEN YOU MUST NOT DO THE REPAIR ON-WING. YOU MUST REMOVE AND REPAIR THE PART AS PER THE APPLICABLE CLEANING, INSPECTION & REPAIR MANUAL.

CAUTION: MAKE SURE THAT DURING THE REPAIR, PARTS AND DEBRIS DO NOT GO INTO THE ENGINE. IF THEY DO, DAMAGE TO THE ENGINE WILL OCCUR.

(1) Find the AGB attached to the Main Gearbox (MGB) at the 6 o'clock position.
(2) Remove all the external attachments that are necessary to help with the removal and installation of insert(s) (Ref. AMM TASK 72-61-01-000-801).
(3) Remove the loose or the damaged helical coil insert(s) from the AGB by SPOP 415 (Ref. AMM TASK 70-24-00-910-803).
(4) Do a visual inspection of the helical coil-sert hole(s) for thread damage.
(a) No damage is permitted.
(5) Install the new EIPC 72-62-01-01-000 INSERT OPTION (1) by SPOP 415 (Ref. AMM TASK 70-24-00-910-803).
(a) It is not permitted to install the oversized insert(s) or twinserts.
(6) Do a visual inspection of the installed insert(s):
(a) Make sure that the insert(s) are in the limits of SPOP 415.
(b) Make sure that the oversized insert(s) or twinserts are not installed (Ref. AMM TASK 70-24-00-910-803).
(7) Install all the external attachments that were necessary to help with the removal and installation of the insert(s) (Ref. AMM TASK 72-61-01-400-801).
(8) Examine the assembly for the foreign objects, damage and correct assembly.

5. Close-up
Subtask 72-62-01-410-051-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL.

Subtask 72-62-01-440-051-A ** ON A/C NOT FOR ALL

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

Subtask 72-62-01-410-052-A ** ON A/C NOT FOR ALL

C. 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 access platform(s).

[Rev.10 from 2021] 2026.04.01 02:50:20 UTC