Detailed Inspection of the Engine Fan Case V-Groove [PW11]

TASK 72-21-01-220-804-A
Detailed Inspection of the Engine Fan Case V-Groove

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.

1. Reason for the Job
Refer to the MPD TASK: 722102-01
DETAILED INSPECTION OF ENGINE FAN CASE V-GROOVE.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
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 72-21-00-220-801-A	Detailed Visual Inspection (DVI) of the Fan Case External Surfaces
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
Detailed Visual Inspection (DVI) Of The Fan Case Outer V-Groove

3. Job Set-up
Subtask 72-21-01-941-055-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 72-21-01-010-052-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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 72-21-01-040-050-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 72-21-01-010-053-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 72-21-01-220-052-A ** ON A/C NOT FOR ALL

A. Detailed Visual Inspection (DVI) Of The Fan Case Outer V-Groove
(1) Examine the fan case outer V-groove. Inspect Area B only if the cowl door seal is removed. Refer to Table 1.

Detailed Visual Inspection (DVI) Of The Fan Case Outer V-Groove ** ON A/C NOT FOR ALL

(2) Examine the fan cowl door seal (Ref. AMM TASK 72-21-00-220-801).

Table 1 Fan Case Outer V-Groove - Visual Inspection

EXAMINE	DAMAGE	DISPOSITION
Cracks in Area A and Area B	All quantities	Not permitted. Contact Pratt & Whitney.
Galling and chaffing in Area A	All quantities less than 0.005 in. (0.13 mm) in depth	Permitted for continued operation
	All quantities between 0.005 in. (0.13 mm) and 0.010 in. (0.25 mm) in depth	Contact Pratt & Whitney.
	All quantities more than 0.010 in. (0.25 mm) in depth	Not permitted
Nicks, scratches and dents in Area A	Any amount up to 0.005 in. (0.127 mm) depth	Permitted for continued service
	Any amount up to 0.020 in. (0.508 mm) depth	Contact Pratt & Whitney.
	Any amount more than 0.020 in. (0.508 mm) depth	Not permitted
Surface damage in Area B	Any amount	Contact Pratt & Whitney.

(3) For all other damage (Ref. AMM TASK 72-21-00-220-801).

5. Close-up
Subtask 72-21-01-410-051-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 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 72-21-01-440-050-A ** ON A/C NOT FOR ALL

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

Subtask 72-21-01-410-052-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).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:02:26 UTC