Replacement of the Low Pressure Compressor (LPC) Case Assembly Borescope Port Insert [PW11]

TASK 72-31-01-960-802-A
Replacement of the Low Pressure Compressor (LPC) Case Assembly Borescope Port Insert

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.

ZONE: 400

1. Reason for the Job
Use this procedure to repair loose, missing, or damaged borescope port helical coil inserts on the LPC case assembly.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P18-023)	primer, zinc molybdate

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, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-24-00-910-803-A	SPOP 415 - Installation of Helical Coil Threaded Inserts
TASK 70-28-00-910-803-A	SPOP 42 - Chromate Conversion Coating of Aluminum
TASK 70-28-00-910-806-A	SPOP 157 - Application of Zinc Molybdate Primer (AMS 3117)
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 72-21-08-000-801-A	Removal of the Fan Exit Liner Segments
TASK 72-21-08-400-801-A	Installation of the Fan Exit Liner Segments
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
LPC Case Assembly Borescope Port Helical Coil Inserts

3. Job Set-up
Subtask 72-31-01-941-051-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 72-31-01-010-054-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
(2) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.

Subtask 72-31-01-040-052-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 72-31-01-010-055-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the right thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR

4. Procedure
Subtask 72-31-01-960-051-A ** ON A/C NOT FOR ALL

A. Replacement of the LPC Case Assembly Borescope Port Insert

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

(1) Obey the instructions that follow:
(a) This engine maintenance manual repair authorizes only the replacement of original manufacturers helical coil inserts. If there is damage to the hole(s) and an oversized insert is needed, then the repair must not be carried out on-wing. The part must be removed and repaired in accordance with the respective cleaning, inspection and repair manual as applicable.
(2) Find the LPC case assembly. See sheet 1 of the figure:

LPC Case Assembly Borescope Port Helical Coil Inserts ** ON A/C NOT FOR ALL

(3) Remove the fan exit liner segments necessary to gain access to the repair area (Ref. AMM TASK 72-21-08-000-801).
(4) Remove the loose or damaged LPC case assembly borescope port helical coil inserts by SPOP 415 (Ref. AMM TASK 70-24-00-910-803). See sheet 2 of the figure:

LPC Case Assembly Borescope Port Helical Coil Inserts ** ON A/C NOT FOR ALL

(5) Do a visual inspection of the borescope port threaded hole for damage.
(a) Thread damage is not permitted.
(6) Touch-up all repair area(s) and unprotected aluminum surfaces by SPOP 42 (Ref. AMM TASK 70-28-00-910-803).
(7) Apply the P18-023primer, zinc molybdate to the helical coil inserts, the LPC case assembly mating surfaces and the borescope boss faces of surfaces G and H by SPOP 157 (Ref. AMM TASK 70-28-00-910-806).
(a) You must install the helical coil inserts while the primer is wet.
(8) Install a new helical coil insert in the LPC case assembly borescope port by SPOP 415 (Ref. AMM TASK 70-24-00-910-803).
(a) Installation of oversized or twin helical coil inserts are not permitted.
(b) The top of the helical coil insert must be one to one and one half threads below the surface G or H.
(9) Remove excess primer after installation.
(10) Do a visual inspection of the repaired area(s) to make sure that the requirements of SPOP 415 are met (Ref. AMM TASK 70-24-00-910-803).
(11) Install the fan exit liner segments as necessary (Ref. AMM TASK 72-21-08-400-801).
(12) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 72-31-01-410-054-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 right thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR

Subtask 72-31-01-440-052-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 72-31-01-410-055-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).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:49:13 UTC