Repair the Surface Erosion Coating of the Fan Exit Guide Vane (FEGV) Assembly [PW11]

TASK 72-21-02-320-801-A
Repair the Surface Erosion Coating of the Fan Exit Guide Vane (FEGV) Assembly

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS 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.

WARNING: YOU MUST USE A CORRECT EYE PROTECTION WHEN YOU PERFORM THIS PROCEDURE. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

ZONE: 410
ZONE: 420

1. Reason for the Job
Use this procedure to touch-up the missing or loose coating on the surface of the Fan Exit Guide Vane (FEGV) assembly.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	BLADE - RAZOR
No specific	1	MAT - PROTECTIVE
No specific	1	PAINTBRUSH
No specific	1	SCALPEL
No specific	1	SCISSORS

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-038)	cheesecloth - bleached, new, woven, unsized
(Material No.P05-053)	coating, polyurethane
(Material No.P05-153)	abrasive paper, silicon carbide
(Material No.P05-160)	carbide silicon grit
(Material No.P05-224)	emery cloth
(Material No.P05-376)	tape, masking (crepe paper backing)
(Material No.P05-421)	Scrub Pad
(Material No.P05-422)	pad, scrub
(Material No.P05-438)	coating, polyurethane base
(Material No.P05-439)	catalyst
(Material No.P05-493)	tape, non-silicone adhesive, polyester
(Material No.P11-065)	Acetone

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-27-00-910-804-A	SPOP 208 - Degreasing of Parts by Solvent Wiping
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 72-11-03-000-801-A	Removal of the Fan Blades
TASK 72-11-03-400-801-A	Installation of the Fan Blades
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
Repair the Surface Erosion Coating - Fan Exit Guide Vane (FEGV) Assembly

3. Job Set-up
Subtask 72-21-02-941-060-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 72-21-02-010-066-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 72-21-02-040-057-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 72-21-02-010-067-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

Subtask 72-21-02-010-068-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Put an intake cowl MAT - PROTECTIVE inside the engine intake cowl and fan case inside surfaces.
(2) For better access (from the front), removal of fan blades is optional. Remove minimum number of fan blades as necessary to gain access for the repair area (Ref. AMM TASK 72-11-03-000-801).

4. Procedure

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

Subtask 72-21-02-320-050-A ** ON A/C NOT FOR ALL

A. Reparation of the Surface Erosion Coating of the Fan Exit Guide Vane (FEGV) Assembly
(1) Doing the next step, do not remove coating that is securely bonded and ensure that surface of the airfoil is not nicked, scratched or otherwise damaged particularly when using a BLADE - RAZOR.
(2) Completely remove any loose or dis-bonded black erosion coating using a BLADE - RAZOR, SCISSORS, SCALPEL or other type of cutting tools.
(3) Do not damage the primer (light green coating) when you abrade in the next steps.
(4) Lightly abrade the repair area(s) with emery cloth (Material No.P05-224) , P05-153abrasive paper, silicon carbide, carbide silicon grit (Material No.P05-160) or Scrub Pad (Material No.P05-421) or P05-422pad, scrub to remove loose or missing coating on FEGV surface and remove gloss from the areas adjacent to the repair.
(a) Do a check to ensure adjacent coating is securely bonded.
(5) Clean the surface of FEGV by SPOP 208 using Acetone (Material No.P11-065) (Ref. AMM TASK 70-27-00-910-804).
(6) Abrade the erosion coat using Scrub Pad (Material No.P05-421) or P05-422pad, scrub.
(7) Clean the surface of FEGV by SPOP 208 using Acetone (Material No.P11-065) (Ref. AMM TASK 70-27-00-910-804).

CAUTION: DO NOT USE COMPRESSED AIR TO DRY THE REPAIR SURFACE. IF YOU DO, CONTAMINATION OF THE REPAIR AREA WILL OCCUR.

(a) Allow the surface to air dry between 60 deg.F (15.56 deg.C) and 90 deg.F (32.22 deg.C) for a minimum of 15 minutes.
(8) Make sure that primer (light green coating) is intact in the repair area.
(9) Determine the touch-up area and apply masking tape around the area. Use P05-376tape, masking (crepe paper backing) or P05-493tape, non-silicone adhesive, polyester.
(a) In the leading edge area, leave space to make sure that the repair coating overlaps with the leading edge surface forward of the repair and the intact erosion coat aft of the repair.
(b) On the vane surface, leave space to make sure that the coating overlaps with the surrounding erosion coating.
(10) Prepare the coating by step 4.A.(10).(a) or 4.A.(10).(b).
(a) Prepare the P05-438coating, polyurethane base as follows:
1 Shake or stir the P05-438coating, polyurethane base fully.
2 Add one part by volume of catalyst (Material No.P05-439) to three parts by volume of P05-438coating, polyurethane base.
(b) Prepare the P05-053coating, polyurethane as follows:
1 Mix per the manufacturer's instructions. Do not use thinner.
(11) Use a PAINTBRUSH to apply the P05-438coating, polyurethane base or P05-053coating, polyurethane on the repair area. In the leading edge area, make sure that the repair coating overlaps with the vane leading edge surface forward of the repair and the intact erosion coat aft of the repair. On the vane surface, make sure that the coating overlaps with the surrounding erosion coating.
(a) Do not apply coating on outer and inner support.
(b) Use P05-038cheesecloth - bleached, new, woven, unsized to remove any drips, splashes or coating not in the repair area.
(c) If desired, it is permissible to apply an additional coat of polyurethane coating.
1 Wait a minimum of 15 minutes after applying the first coat.
2 Apply the second coat with PAINTBRUSH strokes as close as possible to a 90 degree angle to the original PAINTBRUSH strokes.
(d) Remove the masking tape from the protected areas before curing.
(e) Cure between 60 deg.F (15.56 deg.C) and 90 deg.F (32.22 deg.C) for a minimum of 24 hours or for a minimum of 8 hours with subsequent visual inspection of the repaired fan exit guide vane(s) for satisfactory condition of the touch-up coating after 1 flight or after 16 hours from the completion of the 8 hours minimum cure cycle, whichever is earlier.

Subtask 72-21-02-210-051-A ** ON A/C NOT FOR ALL

B. Visual Inspection
(1) Do a visual inspection of the repaired area(s) after all coating process.
(a) No primer (light green coating) exposure is permitted.

5. Close-up
Subtask 72-21-02-410-063-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Install the fan blades if necessary (Ref. AMM TASK 72-11-03-400-801).
(2) Remove the MAT - PROTECTIVE from the air intake cowl.

Subtask 72-21-02-410-061-A ** ON A/C NOT FOR ALL

B. 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 72-21-02-440-055-A ** ON A/C NOT FOR ALL

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

Subtask 72-21-02-410-062-A ** ON A/C NOT FOR ALL

D. 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 02:48:39 UTC