Detailed Visual Inspection (DVI) of the Fan Exit Guide Vanes (FEGV) [PW11]

TASK 72-21-02-220-801-A
Detailed Visual Inspection (DVI) of the Fan Exit Guide Vanes (FEGV)

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.

ZONE: 400

1. Reason for the Job
Use this procedure to do a detailed visual inspection of the Fan Exit Guide Vanes (FEGVs) for damage (nicks, scratches, cracks, dents, chipped or missing coating).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	1	FLASHLIGHT
No specific	1	GLOVES - PROTECTIVE
No specific	1	MAT - PROTECTIVE
636-1100-3GSE	1	INLET COWL PROTECT COVER

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 72-21-02-000-803-A	Removal of the Structural Guide Vane
TASK 72-21-02-320-801-A	Repair the Surface Erosion Coating of the Fan Exit Guide Vane (FEGV) Assembly
TASK 72-21-02-400-803-A	Installation of the Structural Guide Vane
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 of the Fan Exit Guide Vanes (FEGVs)

3. Job Set-up
Subtask 72-21-02-941-052-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 72-21-02-010-054-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 2M (6 FT) in position.

Subtask 72-21-02-040-052-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 72-21-02-010-055-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 72-21-02-220-050-A ** ON A/C NOT FOR ALL

A. Detailed Visual Inspection of the Fan Exit Guide Vanes (FEGVs)
(1) Do a detailed visual inspection of the FEGV for damage with a FLASHLIGHT. If you see damage, refer to Table 601.
(2) Put an 636-1100-3GSE INLET COWL PROTECT COVER or equivalent MAT - PROTECTIVE inside the engine inlet.
(3) Wear GLOVES - PROTECTIVE when you touch the fan blades.

Table 601: FEGV Inspection

EXAMINE	DAMAGE	DISPOSITION

Area B and Area C of vane surfaces (except Area D and Area E) erosion coating	Missing, chipped or loose erosion coating less than 0.25 in. (6.35 mm) in diameter	Permitted with inspection every 500 flight cycles or repair (Ref. AMM TASK 72-21-02-320-801) within 500 flight cycles and reinspect every 500 flight cycles. Any amount of missing, chipped or loose erosion coating in Area C is permitted for continued service.
	Missing, chipped or loose erosion coating more than 0.25 in. (6.35 mm) in diameter	Permitted with inspection every 500 flight cycles. Any amount of missing, chipped or loose erosion coating in Area C is permitted for continued service.
Area B and Area C of vane surfaces (except Area D and Area E) primer coating (primer coating is light green)	Missing, chipped or loose primer coating	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within 500 flight cycles.
Area D of convex side of vane surfaces erosion coating	Missing, chipped or loose erosion coating	Permitted with inspection every 500 flight cycles or repair (Ref. AMM TASK 72-21-02-320-801) within 500 flight cycles and reinspect every 500 flight cycles.
Area D of convex side of vane surfaces primer coating (primer coating is light green)	Missing, chipped or loose primer coating	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within 500 flight cycles.
Area E of concave side of vane surfaces erosion coating	Missing, chipped or loose erosion coating less than 1 in. (25.40 mm) in diameter, possibly caused by contact with the inner structural guide vane liner segment during assembly or disassembly	Permitted with inspection every 500 flight cycles or repair (Ref. AMM TASK 72-21-02-320-801) within 500 flight cycles and reinspect every 500 flight cycles.
	Missing, chipped or loose erosion coating more than 1 in. (25.40 mm) in diameter	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within 500 flight cycles.
Area E of concave side of vane surfaces primer coating (primer coating is light green)	Missing, chipped or loose primer coating	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within 500 flight cycles.
All vane surface areas covered with erosion coating	Erosion coating that is lifted or has loss of bond	Permitted. Cut away the coating that is lifted or has loss of bond by the requirements specified in (Ref. AMM TASK 72-21-02-320-801) within ten flight cycles. Examine the primer or base metal that you can see to the limits specified above.
Vane leading edge and trailing edge surfaces (Area A and Area C) for dents or distortion	Not more than four dents for each airfoil and less than 0.030 in. (0.76 mm) in depth separated from other dents by 1.0 in. (25.40 mm). No delamination.	Permitted.
	One dent for each airfoil more than 0.030 in. (0.76 mm) depth. No delamination.	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within five flight cycles.
Vane leading edge and trailing edge surfaces (Area A and Area C) for nicks	Up to a maximum of four nicks less than 0.020 in. (0.51 mm) depth for each airfoil separated from other nicks by 1.0 in. (25.40 mm). No delamination.	Permitted.
	Up to 0.030 in. (0.762 mm) depth for each airfoil. No delamination.	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within ten flight cycles.
	Nicks more than 0.030 in. (0.76 mm) depth for each airfoil. No delamination.	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within five flight cycles.
Vane leading edge and trailing edge surfaces (Area A and Area C) for cracks, tears, or delamination (separated layers)	None permitted. No delamination.	Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) . Remove the vane from service immediately.
Concave and convex vane airfoil surfaces (Area B) for round-bottom dents	Not more than four dents for each vane and less than 0.030 in. (0.76 mm) in depth separated from other dents by 1.0 in. (25.40 mm). No delamination.	Permitted.
	More than four dents for each vane and less than 0.030 in. (0.76 mm) depth separated from other dents by 1.0 in. (25.40 mm). No delamination.	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within ten flight cycles.
	Dents more than 0.030 in. (0.76 mm) depth. No delamination.	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within five flight cycles.
Concave and convex vane airfoil surfaces (Area B) for nicks and scratches	Up to a maximum of two nicks or scratches less than 0.020 in. (0.51 mm) in depth separated from other nicks or scratches by 1.0 in. (25.40 mm). No delamination.	Permitted.
	Nicks or scratches up to 0.030 in. (0.76 mm) depth for each airfoil. No delamination.	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within ten flight cycles.
	Nicks or scratches more than 0.030 in. (0.76 mm) depth for each airfoil. No delamination.	Permitted. Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) within five flight cycles.
Concave and convex vane surfaces (Area B) for cracks or delamination	None permitted	Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) . Remove the vane from service immediately.
Inner Diameter (ID) and Outer Diameter (OD) support (Area F) for round-bottom dents	All quantities less than 0.004 in. (0.10 mm) in depth	Permitted.
ID and OD support (Area F) for nicks and scratches (smooth contour with raised metal removed)	All quantities less than 0.004 in. (0.10 mm) in depth	Permitted.
Metal leading edge disbond	None permitted	Replace damaged vanes (Ref. AMM TASK 72-21-02-000-803) and (Ref. AMM TASK 72-21-02-400-803) . Remove the vane from service immediately.

(4) Remove the 636-1100-3GSE INLET COWL PROTECT COVER or equivalent MAT - PROTECTIVE from the air intake cowl.
(5) Examine the assembly for foreign objects, damage, and correct assembly.

5. Close-up
Subtask 72-21-02-410-052-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 72-21-02-440-051-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 72-21-02-410-053-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 13:02:08 UTC