Detailed Visual Inspection (DVI) of the Stator Guide Vane (SGV) Inner Liner [PW11]

TASK 72-21-12-220-801-A
Detailed Visual Inspection (DVI) of the Stator Guide Vane (SGV) Inner Liner

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
Self explanatory
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

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 72-21-08-000-801-A	Removal of the Fan Exit Liner Segments
TASK 72-21-08-400-801-A	Installation 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
Detailed Visual Inspection (DVI) of the Stator Guide Vane (SGV) Inner Liner

3. Job Set-up
Subtask 72-21-12-941-053-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 72-21-12-010-056-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 the ACCESS PLATFORM 2M (6 FT) in position.

Subtask 72-21-12-040-053-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 72-21-12-010-057-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 72-21-12-220-051-A ** ON A/C NOT FOR ALL

A. Detailed Visual Inspection (DVI) of the Stator Guide Vane (SGV) Inner Liner
(1) Do a DVI of the SGV inner liner for damage. Use a FLASHLIGHT if necessary.
(a) Wear GLOVES - PROTECTIVE when you touch the fan blades.
(b) Put the MAT - PROTECTIVE inside the air intake cowl.

Table 1 - SGV Inner Liner - Visual Inspection

EXAMINE	DAMAGE	DISPOSITION
Liner flow path surface for:	Cracks	Not permitted. Replace the damaged liner before next flight (Ref. AMM TASK 72-21-08-000-801) and (Ref. AMM TASK 72-21-08-400-801).
	Nicks, dents or scratches not more than 0.039 in. (0.991 mm) maximum depth, all quantities	Permitted
	Nicks, dents or scratches more than 0.039 in. (0.991 mm) maximum depth	Not permitted. Replace the damaged liner in 50 flight cycles (Ref. AMM TASK 72-21-08-000-801) and (Ref. AMM TASK 72-21-08-400-801).
	Surface erosion not more than 0.030 in. (0.762 mm) maximum depth, all quantities	Permitted
	Surface erosion more than 0.030 in. (0.762 mm) maximum depth	Not permitted. Replace the damaged liner in 50 flight cycles (Ref. AMM TASK 72-21-08-000-801) and (Ref. AMM TASK 72-21-08-400-801).
	Punctures, holes or missing materials	Not permitted. Replace the damaged liner in ten flight cycles (Ref. AMM TASK 72-21-08-000-801) and (Ref. AMM TASK 72-21-08-400-801).
Rubber fillet for:	Wear, peeling, detachment or missing material, all quantities	Permitted. Loose rubber fillets may be cut away, which are possible to be released from the liner.

(2) Remove the MAT - PROTECTIVE from the air inlet cowl.

5. Close-up
Subtask 72-21-12-410-054-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 72-21-12-440-052-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 72-21-12-410-055-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 02:49:07 UTC