General Visual Inspection (GVI) of the Angle Gearbox [PW11]

TASK 72-62-00-210-802-A
General Visual Inspection (GVI) of the Angle Gearbox

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
Use this procedure to do a visual inspection of the angle gearbox for cracks, corrosion, mount bolts, and leakage.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	COVER - PROTECTION
No specific	1	FLASHLIGHT

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, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

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 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 72-62-01-000-801-A	Removal of the Angle Gearbox
TASK 72-62-01-100-801-A	Cleaning of the Angle Gearbox with a Chemical Agent
TASK 72-62-01-400-801-A	Installation of the Angle Gearbox
TASK 72-62-01-920-801-A	Replacement of the Helical Coil Insert(s) on the Angle Gearbox (AGB)
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
GVI of the Angle Gearbox

3. Job Set-up
Subtask 72-62-00-941-055-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 72-62-00-010-060-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 72-62-00-040-056-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 72-62-00-010-061-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.

4. Procedure
Subtask 72-62-00-210-053-A ** ON A/C NOT FOR ALL

A. GVI of the Angle Gearbox

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) Find the angle gearbox module attached to the compressor intermediate case at the 6 o'clock position.
(3) Do a visual inspection of the angle gearbox as follows:
(a) Clean the angle gearbox, if necessary (Ref. AMM TASK 72-62-01-100-801).
(b) Do a visual inspection of the angle gearbox for cracks and corrosion with the FLASHLIGHT. Refer to table 1.
(c) Examine the angle gearbox for oil leakage from all plugs, chip detectors and parting surfaces. Leaks are not permitted, correct all leaks as necessary.
(d) Do a visual inspection of the angle gearbox for loose, missing or broken mount and layshaft bolts. Refer to table 2.
(e) Do a visual inspection of the angle gearbox output drive. Refer to table 3.

EXAMINE	DAMAGE	DISPOSITION
For cracks	All quantity, all locations.	Not permitted. Replace the angle gearbox (Ref. AMM TASK 72-62-01-000-801) and (Ref. AMM TASK 72-62-01-400-801).
For corrosion	Depth of corrosion is less than 0.035 in. (0.889 mm).	Gearbox is permitted to continue in service.
	Depth of corrosion is more than 0.035 in. (0.889 mm).	Not permitted. Replace the angle gearbox (Ref. AMM TASK 72-62-01-000-801) and (Ref. AMM TASK 72-62-01-400-801).
	Total surface area with corrosion is less than 1.00 in.2 (645.16 mm2). See the NOTE below the table.	Gearbox is permitted to continue in service.
	Total surface area with corrosion is more than 1.00 in.2 (645.16 mm2). See the NOTE below the table.	Not permitted. Replace the angle gearbox (Ref. AMM TASK 72-62-01-000-801) and (Ref. AMM TASK 72-62-01-400-801).

Table - Damage limits for the angle gearbox

NOTE: Corrosion areas that are less than 2.00 in. (50.80 mm) apart are counted as one area but the total surface in that area must be less than the 1.00 in.2 (645.16 mm2) limit.

EXAMINE	DAMAGE	DISPOSITION
Layshaft bolts	Loose, missing or broken.	Not permitted. Replace the bolt or the helical coil (Ref. AMM TASK 72-62-01-000-801) and (Ref. AMM TASK 72-62-01-400-801) or (Ref. AMM TASK 72-62-01-920-801).
Mount bolts	Loose, missing or broken.	Not permitted. Replace the bolt or the helical coil (Ref. AMM TASK 72-62-01-000-801) and (Ref. AMM TASK 72-62-01-400-801) or (Ref. AMM TASK 72-62-01-920-801).

Table - Damage limits for the angle gearbox hardware

EXAMINE	SERVICEABLE LIMITS	REPAIRABLE LIMITS	DISPOSITION/REPAIR
Angle gearbox output drive for:
Looseness	Not permitted	Contact P&W	Contact P&W
Missing material that extends across more than three adjacent spline teeth.	Not permitted	Contact P&W	Contact P&W
Missing material locally at each spline location.	Permitted	Contact P&W	Contact P&W
Unwanted material in and around the spline.	If unwanted material is found, it must be removed	Contact P&W	Contact P&W

Table - Angle gearbox - visual inspection

(4) Examine the assembly for foreign objects, damage and correct assembly.
(5) 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 all the necessary COVER - PROTECTION to prevent damage to the engine.

5. Close-up
Subtask 72-62-00-410-060-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 thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.

Subtask 72-62-00-440-054-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 72-62-00-410-061-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Remove the access platform(s).
(2) 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.
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:50:15 UTC