Do an Erosion Coat Touch-Up Repair of the Fan Blade Assembly - Top Coat Repair [PW11]

TASK 72-11-03-320-804-A
Do an Erosion Coat Touch-Up Repair of the Fan Blade Assembly - Top Coat Repair

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.

WARNING: USE PROTECTIVE GLOVES TO PREVENT POSSIBLE INJURY TO THE HANDS WHEN YOU TOUCH OR HOLD THE FAN BLADES. THE BLADE EDGES ARE SHARP AND CAN CUT THE HANDS.

CAUTION: USE MAXIMUM CAUTION WITH ANY ELECTRICAL EQUIPMENT IN THE AREA OF THE BLADE. CONTACT WITH ANY ELECTRICAL SOURCE THAT CAN PASS CURRENT TO THE BLADE SURFACE CAN CAUSE AN ARC BURN. AN ARC BURN CAN CAUSE LOCAL DEGRADATION OF MATERIAL PROPERTIES AND BEGIN A CRACK.

CAUTION: DO NOT REMOVE POLYURETHANE COAT THAT IS TIGHTLY BONDED. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE FAN BLADE CAN OCCUR.

CAUTION: MAKE SURE THAT THE BLADE SURFACE HAS NO NICKS, SCRATCHES OR OTHER SIGNS OF DAMAGE WHEN YOU USE A RAZOR BLADE OR DURING THE REPAIR PROCEDURE. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE FAN BLADE CAN OCCUR.

CAUTION: DO NOT REMOVE MATERIAL FROM THE FAN BLADE BASE MATERIAL. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE FAN BLADE CAN OCCUR.

CAUTION: DO NOT USE MATERIALS OR TOOLING THAT CONTAIN SILICONE. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE FAN BLADE CAN OCCUR.

CAUTION: DO NOT APPLY ACETONE DIRECTLY TO A BLADE. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE BLADE CAN OCCUR.

ZONE: 400

1. Reason for the Job
Use this repair procedure to locally touch-up repair damage to the erosion coat that touches the primer but does not show parent material of the fan blade assembly.
For more information about the fan rotor, refer to (72-11-00-00U).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	BLADE - RAZOR
No specific	1	KNIFE- RAZOR
No specific	1	MAT - PROTECTIVE
No specific	1	SCISSORS
636-1100-3GSE	1	INLET COWL PROTECT COVER

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	lint-free cotton cloth
(Material No.P05-038)	cheesecloth - bleached, new, woven, unsized
(Material No.P05-060)	demineralized water
(Material No.P05-126)	brush, short bristle nylon
(Material No.P05-145)	tape, masking polyester film (mylar)
(Material No.P05-154)	coating, polyurethane, erosion resistant
(Material No.P05-422)	pad, scrub
(Material No.P05-437)	tape, pressure sensitive polyester
(Material No.P11-065)	acetone
(Material No.P18-018)	primer, epoxy, corrosion inhibiting

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-27-00-910-810-A	PWA 83 - Cleaning of Parts Before Adhesive Bonding, Sealing or Filling
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 72-11-03-700-801-A	Adhesion Acceptance Test of the Fan Blade Coat at Leading-Edge Sheath Interface (Manual Test)
Fan Blade - Add Material

3. Job Set-up
Subtask 72-11-03-941-061-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).
(2) Put the 636-1100-3GSE INLET COWL PROTECT COVER or equivalent and the MAT - PROTECTIVE on the engine intake cowl to protect the inner surfaces.

4. Procedure
Subtask 72-11-03-350-050-A ** ON A/C NOT FOR ALL

A. Do an Erosion Coat Touch-Up Repair of the Fan Blade Assembly

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

(1) Refer to Table 601 and examine the damaged fan-blade erosion-coat surfaces.
(2) Remove all loose or not bonded black erosion-coat with the BLADE - RAZOR, SCISSORS, KNIFE- RAZOR or other equivalent cutting tool.
(3) Do a visual inspection of the repair area(s) as follows:
(a) Make sure that all loose or not bonded erosion-coat is removed.
(b) Make sure that there are no nicks, scratches or damage to the fan-blade parent metal.
(c) Make sure that there is no damaged, loose or missing epoxy filler compound at the seam between the fan blade and fan blade cover and/or behind the Leading Edge (LE) sheath.
(d) Make sure that there is no damage through the P18-018primer, epoxy, corrosion inhibiting.
(4) Clean the repair area(s) by PWA 83-A4 with the lint-free cotton cloth (Material No.P05-005) and the acetone (Material No.P11-065) (Ref. AMM TASK 70-27-00-910-810).
(5) Coating on the damaged area(s):

CAUTION: DO NOT APPLY COAT TO THE LEADING EDGE SHEATH. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE PART CAN OCCUR.

CAUTION: MAKE SURE THAT EPOXY PRIMER DOES NOT GO ON THE POLYURETHANE TOP COAT. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE COAT CAN OCCUR.

(a) Make a template of the repair area(s) with the P05-145tape, masking polyester film (mylar) or the P05-437tape, pressure sensitive polyester. Keep a minimum distance of 0.125 in. (3.175 mm) from the damage edge. For repairs adjacent to the LE sheath, put the P05-145tape, masking polyester film (mylar) or the P05-437tape, pressure sensitive polyester on the titanium LE.
(b) Clean the repair area(s) as follows:
1 Wipe the repair area(s) outboard with the P05-038cheesecloth - bleached, new, woven, unsized and the acetone (Material No.P11-065) .
2 Wait for five minutes for the acetone (Material No.P11-065) to dry.
3 Make the repair and adjacent area(s) rough with the P05-422pad, scrub and the acetone (Material No.P11-065) .
4 Wipe the repair area(s) with the P05-038cheesecloth - bleached, new, woven, unsized and the acetone (Material No.P11-065) .
5 Wait for five minutes for the acetone (Material No.P11-065) to dry.
6 Make the repair and adjacent area(s) rough with the P05-422pad, scrub and the acetone (Material No.P11-065) .
7 Wipe the repair area(s) with the P05-038cheesecloth - bleached, new, woven, unsized and the acetone (Material No.P11-065) .
8 Wait for five minutes for the acetone (Material No.P11-065) to dry.
9 Refer to Table 601 and examine the repair area(s) again to make sure that the repair area(s) is (are) still in the approved limits.
(c) Mix the P18-018primer, epoxy, corrosion inhibiting by the manufacturer's instructions. Acetone (Material No.P11-065) can be used as an alternative for the demineralized water (Material No.P05-060) to mix the P18-018primer, epoxy, corrosion inhibiting, if necessary.

NOTE: The mixture quantities will be different if the acetone (Material No.P11-065) is used as an alternative to demineralized water (Material No.P05-060) .

(d) Apply a single coat of the P18-018primer, epoxy, corrosion inhibiting with the new no. 4 P05-126brush, short bristle nylon. It is necessary to apply a coat of no more than 0.125 in. (3.175 mm) onto the adjacent polyurethane.

NOTE: P18-018Primer, epoxy, corrosion inhibiting is not permitted on the ground tab.

(e) Let the P18-018primer, epoxy, corrosion inhibiting dry at room temperature and then remove the P05-145tape, masking polyester film (mylar) or P05-437tape, pressure sensitive polyester.
(f) Cure the P18-018primer, epoxy, corrosion inhibiting by one of the steps that follow:
1 Cure at 130 deg.F (54 deg.C) to 170 deg.F (77 deg.C) for a minimum of 30 minutes.
2 Cure at 60 deg.F (16 deg.C) to 90 deg.F (32 deg.C) for a minimum of six hours.
(g) Keep the repair area(s) free from contamination until the P05-154coating, polyurethane, erosion resistant is applied.
(6) Replace the LE P05-145tape, masking polyester film (mylar) or the P05-437tape, pressure sensitive polyester.
(7) Mix the P05-154coating, polyurethane, erosion resistant by the manufacturer's instructions.
(8) Apply a single coat of the P05-154coating, polyurethane, erosion resistant with the new P05-126brush, short bristle nylon as follows:

NOTE: The P05-154coating, polyurethane, erosion resistant is not permitted on the ground tab.

(a) Apply the P05-154coating, polyurethane, erosion resistant again in a crosshatch pattern to a thickness equal to the height of the adjacent, non-damaged erosion-resistant coat.

NOTE: The P05-154coating, polyurethane, erosion resistant layer must be dry to the touch before you apply the next layer. It is permitted to use the P05-154coating, polyurethane, erosion resistant on a test piece to prevent contamination of the repair area(s).

(b) Replace the LE P05-145tape, masking polyester film (mylar) or the P05-437tape, pressure sensitive polyester between coats if it shows the P05-154coating, polyurethane, erosion resistant build up. Do not wipe with solvent before or after you apply the P05-145tape, masking polyester film (mylar) or the P05-437tape, pressure sensitive polyester again.
(c) Make sure that the overcoat on the adjacent, non-damaged erosion-resistant coat is not more than 0.125 in. (3.175 mm).
(9) Let the P05-154coating, polyurethane, erosion resistant air dry for 15 minutes and then remove the P05-145tape, masking polyester film (mylar) or the P05-437tape, pressure sensitive polyester.
(10) Blend the edges of the applied P05-154coating, polyurethane, erosion resistant with the P05-126brush, short bristle nylon.

NOTE: The P05-126brush, short bristle nylon can be wet with P05-154coating, polyurethane, erosion resistant for blending.

(11) Cure the P05-154coating, polyurethane, erosion resistant by one of the methods that follow:
(a) Cure at 130 deg.F (54 deg.C) to 170 deg.F (77 deg.C) for a minimum of four hours.
(b) Cure at 60 deg.F (16 deg.C) to 90 deg.F (32 deg.C) for a minimum of seven days.
(12) Clean the repair area(s) with the clean P05-422pad, scrub and wipe them outboard with the clean P05-038cheesecloth - bleached, new, woven, unsized and the acetone (Material No.P11-065) .
(13) Do a visual inspection of the repair area(s). Make sure that there is no lifting or blistering of the P05-154coating, polyurethane, erosion resistant.
(14) Make the repair area(s) adjacent to the titanium LE rough with the dry P05-422pad, scrub to remove the unwanted P18-018primer, epoxy, corrosion inhibiting and the P05-154coating, polyurethane, erosion resistant. The finished epoxy erosion coat must be flush to below the LE sheath.
(15) If the repaired area(s) is (are) at the interface of the LE sheath, do an approved adhesion acceptance test to the repaired area(s) adjacent to the LE. Make sure that there is no lifting of the P05-154coating, polyurethane, erosion resistant (Ref. AMM TASK 72-11-03-700-801).
(16) Remove the MAT - PROTECTIVE from the engine intake cowl.
(17) Installation of the protection covers:

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install protection cover as necessary to prevent damage to the engine.

Table 601: Fan Blade Coat Area Repairable Limits

EXAMINE	DAMAGE	DISPOSITION
Fan blade polyurethane coat surfaces	Damage that shows primer only (green color)	Go to repair.
	Localized missing or unsatisfactorily bonded erosion resistant coat in Area A	Go to repair.
	Total of five areas maximum, each side	Go to repair.
	Maximum of 3.0 in.2 (1935.5 mm2) on each area	Go to repair.
	Each area seperated by a minimum of 1.0 in. (25.4 mm)	Go to repair.

5. Close-up
Subtask 72-11-03-942-055-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) Remove the 636-1100-3GSE INLET COWL PROTECT COVER from the engine intake cowl.
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:02:19 UTC