General Visual Inspection (GVI) of the Fan Exit Fairing (Upper BiFi) [PW11]

TASK 72-21-04-210-801-A
General Visual Inspection (GVI) of the Fan Exit Fairing (Upper BiFi)

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 do a GVI of the fan exit fairing (upper BiFi).
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
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 72-21-04-000-801-A	Removal of the Fan Exit Fairing - Upper Bifi
TASK 72-21-04-400-801-A	Installation of the Fan Exit Fairing - Upper Bifi
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
General Visual Inspection (GVI) of the Fan Exit Fairing (Upper BiFi)

3. Job Set-up
Subtask 72-21-04-941-052-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 72-21-04-010-054-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 72-21-04-040-052-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 72-21-04-010-055-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.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

4. Procedure

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

Subtask 72-21-04-210-050-A ** ON A/C NOT FOR ALL

A. General Visual Inspection (GVI) of the Fan Exit Fairing (Upper BiFi)
(1) Examine the fan exit fairing (upper BiFi) for damage. Refer to Table 801.

General Visual Inspection (GVI) of the Fan Exit Fairing (Upper BiFi) ** ON A/C NOT FOR ALL

Table 801: Fan Exit Fairing Assembly − Visual Inspection for Surface Damage

EXAMINE	DAMAGE	DISPOSITION
Ti surfaces for:
Cracks	Total of eight maximum, with a 0.250 in. (6.350 mm) maximum length and do not go through full thickness	Replace in 750 cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801).
	Quantity of more than eight, 0.250 in. (6.350 mm) length or more or through the full thickness	Replace in 50 cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801).
Casting voids	Any quantity	Permitted
Nicks, dents and scratches	0.001 in. (0.025 mm) maximum depth	Permitted
	0.004 in. (0.102 mm) maximum depth that is no more than 2.0 in. (50.8 mm) of the maximum major dimension and is not in 0.250 in. (6.350 mm) of other damage	Permitted
	0.004 in. (0.102 mm) maximum depth that is more than 2.0 in. (50.8 mm) of the major dimension or is in 0.250 in. (6.350 mm) of other damage	Repair or replace in 750 cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801). Contact P&W for repair.
	More than 0.004 in. (0.102 mm) depth and no more than 0.075 in. (1.905 mm) that does not go through full thickness	Replace in 750 cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801).
	More than 0.075 in. (1.905 mm) depth or through full thickness	Replace in 50 cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801).
Cover for:
Nicks, dents and scratches	Damage not through full thickness	Permitted
	Damage through full thickness	Replace in five cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801).
Seals for:
Missing condition	Any quantity	Replace in five cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801).
Exposed fabric in silicone	Any quantity	Permitted
Loose, hanging or raised material	Any quantity	Trim material flush to seal face in 750 cycles
Folds in fabric	Any quantity	Permitted
Nicks, gouges and tears	Any quantity	Permitted
Long and short D-seals:
Area A for:
Loose or missing condition	One area with 0.125 in. (3.175 mm) maximum length	Permitted
	More than one area or a single defect more than 0.125 in. (3.175 mm) in length	Replace in five cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801).
Area B for:
Loose or missing condition	One area only with 2.0 in. (50.8 mm) maximum length	Repair or replace in 750 cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801).
	More than one area or more than 2.0 in. (50.8 mm) in length	Repair or replace in 50 cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801).
Plate and pad for:
Nicks and scratches in aft coat	No base metal shown	Permitted
	Base metal shown	Repair or replace in 750 cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801). Contact P&W for repair.
Safety cables for:
Broken or missing condition	Any quantity	Replace in 750 cycles (Ref. AMM TASK 72-21-04-000-801) and (Ref. AMM TASK 72-21-04-400-801).
Drain holes for:
Blockage	Any quantity	Clean holes with an applicable tool to remove foreign material or blockage in 50 cycles

5. Close-up
Subtask 72-21-04-410-052-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 72-21-04-440-051-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 72-21-04-410-051-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 13:02:08 UTC