Detailed Visual Inspection (DVI) of the Fan Exit Case Liner Segment [PW11]

TASK 72-21-08-220-801-A
Detailed Visual Inspection (DVI) of the Fan Exit Case Liner Segment

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.

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 1M(3 FT)
No specific	1	MAT - PROTECTIVE
636-1100-3GSE	1	INLET COWL PROTECT COVER

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 72-21-08-300-801-A	Replacement of the Nut Plates and the Rivets 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
Fan Exit Case Liner Segment

3. Job Set-up
Subtask 72-21-08-410-051-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 72-21-08-010-054-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) in position.

Subtask 72-21-08-040-052-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Maintenance

WARNING: MAKE SURE THAT YOU DO THE DEACTIVATION OF THE THRUST REVERSER BEFORE YOU DO MAINTENANCE WORK ON OR AROUND THE THRUST REVERSER. IF YOU DO NOT DO THIS PROCEDURE, THERE IS A RISK OF UNWANTED OPERATION AND THUS OF INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 72-21-08-010-055-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 72-21-08-220-050-A ** ON A/C NOT FOR ALL

A. Detailed Visual Inspection (DVI) of the Fan Exit Case Liner Segment

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

(1) Put an 636-1100-3GSE INLET COWL PROTECT COVER or MAT - PROTECTIVE in the air intake cowl.
(2) Do a DVI of the fan exit case liner segments. Refer to Table 601 and to the figure.

Table 601: DVI of the fan exit case liner segments

EXAMINE	DAMAGE	DISPOSITION
All surfaces for:
Cracks	Not permitted	Contact Pratt & Whitney.
Sharp edges and raised material	Not permitted	Contact Pratt & Whitney.
Liner surfaces (1) for:
Nicks, dents and scratches	0.030 in. (0.76 mm) maximum depth is permitted	Contact Pratt & Whitney.
Delamination	Not permitted	Contact Pratt & Whitney.
Broken or fuzzy stray fibers	0.030 in. (0.76 mm) maximum depth is permitted	Contact Pratt & Whitney.
Punctures and holes	Not permitted	Contact Pratt & Whitney.
Surface erosion	Not permitted	Contact Pratt & Whitney.
Nut plate and rivets for:
Loose, missing or damaged condition	Not permitted	Repair the fan exit liner segment (Ref. AMM TASK 72-21-08-300-801).
Seal (3) for:
Cuts, tear and wear	Not permitted	Contact Pratt & Whitney.
Missing or disbonding with the liner	Not permitted	Contact Pratt & Whitney.
Screen (4) for:
Nicks, dents and scratches	Superficial imperfections are permitted	Contact Pratt & Whitney.
Damaged or blocked condition	Not permitted	Contact Pratt & Whitney.
Disbonding with the liner or not properly secured with tabs	Not permitted	Contact Pratt & Whitney.
Missing condition	Not permitted	Contact Pratt & Whitney.

(3) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 72-21-08-860-051-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(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 72-21-08-440-051-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 72-21-08-410-052-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 WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 02:48:58 UTC