Visual Inspection of the Fan Blade Polyurethane-Coat [PW11]

TASK 72-11-03-220-805-A
Visual Inspection of the Fan Blade Polyurethane-Coat

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: BE VERY CAREFUL WHEN YOU USE ELECTRICAL EQUIPMENT NEAR THE AREA OF THE BLADE. THE ELECTRICAL SOURCE MUST NOT SEND ELECTRICAL CURRENT TO THE BLADE SURFACE. IF IT DOES, IT CAN CAUSE AN ARC BURN WHICH CAN START A CRACK. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO ENGINE PARTS CAN OCCUR.

ZONE: 400

1. Reason for the Job
Use this procedure to do a visual inspection of the flow path surface of the fan blade polyurethane-coat.
For visual examination of the polyurethane-coated area of the fan-blade root, refer to (72-11-03-210-801-A).
For more information about fan blade examination, refer to (72-11-00-220-803-A).
For more information about the fan rotor assembly, refer to 72-11-00-00
CONF 21 - FAN ROTOR - DESCRIPTION AND OPERATION.
Do this procedure when you think there is Foreign Object Damage (FOD).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	COVER - PROTECTION
No specific	1	FLASHLIGHT
No specific	AR	GLOVES - PROTECTIVE
No specific	2	MAT - PROTECTIVE
636-1100-3GSE	1	INLET COWL PROTECT COVER

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	Lint-Free Cotton Cloth
(Material No.P05-154)	coating, polyurethane, erosion resistant
(Material No.P05-492)	epoxy

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 72-11-03-000-801-A	Removal of the Fan Blades
TASK 72-11-03-210-802-A	Detailed Inspection of Fan Blades
TASK 72-11-03-210-803-A	Visual Examination of the Fan Blade Galvanic Isolation
TASK 72-11-03-320-804-A	Do an Erosion Coat Touch-Up Repair of the Fan Blade Assembly - Top Coat Repair
TASK 72-11-03-320-805-A	Do an Erosion Coat Touch-Up Repair of the Fan Blade Assembly - Base Coat
TASK 72-11-03-400-801-A	Installation of the Fan Blades
Visual Inspection of the Fan Blade Polyurethane Coat
Visual Inspection of the Fan Blade Root (Fan Blade Colors)

3. Job Set-up
Subtask 72-11-03-941-067-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 72-11-03-010-051-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put the MAT - PROTECTIVE or 636-1100-3GSE INLET COWL PROTECT COVER in position on the inlet cowl.

4. Procedure

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

Subtask 72-11-03-220-056-A ** ON A/C NOT FOR ALL

A. Inspection of the Fan Blade Polyurethane Coat (Flow Path only)
(1) Removal of the protection covers:

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine.
(2) Do the visual inspection of the polyurethane coat of the fan blade (1) (the flow path only). For the inspection limits, refer to Table 601 and see figure:

Visual Inspection of the Fan Blade Polyurethane Coat ** ON A/C NOT FOR ALL

NOTE: The flow path surface is the part of the blade that you can see when the blade is installed in the engine.

NOTE: Area D extends 0.5 in. (12.7 mm) from the top of the platform along the blade and 0.5 in. (12.7 mm) from the side of the blade along the platform.

NOTE: The polyurethane coat is black, the primer is green and the base metal is silver or gray in color.

Visual Inspection of the Fan Blade Root (Fan Blade Colors) ** ON A/C NOT FOR ALL

(a) Use the GLOVES - PROTECTIVE when you touch the fan blades.
(b) If necessary, use the FLASHLIGHT.
(c) If necessary, wipe the fan blade(s) with a Lint-Free Cotton Cloth (Material No.P05-005) .
(d) If the missing coat areas do not show the base metal, you can extend the cycle limits by ten more cycles.
(e) Repair the blades that you removed from service because of the missing coat and put them back in service.
Table 601 - Visual Inspection of the Fan Blade for Erosion

EXAMINE	DAMAGE	DISPOSITION
The polyurethane coat of the fan blade (1):
All areas for:
Missing polyurethane coat without primer or base metal shown.	Any quantity.	Permitted for local FOD. For erosion (Ref. AMM TASK 72-11-03-210-802).
Missing polyurethane coat with primer or base metal shown.	Damage less than 1.00 in.2 (645.16 mm2).	See the specified area shown in this procedure.
	More than 1.00 in.2 (645.16 mm2) primer or base metal that you can see for each side of the fan blade.	Not permitted. Repair or replace the blade in 750 cycles. The repaired coat must not be more than a total of 10.0 in. (254.00 mm) of the radial height on the full blade set, all quantities axially. See additional requirements for Areas D, E and X.
	More than 9.00 in.2 (5806.44 mm2) primer or base metal that you can see for each side of the fan blade. The limits for Areas A thru E above stay applicable.	Not permitted. Repair or replace the blade in 50 cycles. The repaired coat must not be more than a total of 10.0 in. (254.00 mm) of the radial height on the full blade set, all quantities axially. See additional requirements for Area D.
	Polyurethane coat that is lifted or has loss of bond.	Not permitted. In ten cycles, cut away the coat that is lifted or has loss of bond by the requirements specified in (Ref. AMM TASK 72-11-03-320-804) (step 6). Examine the primer or the base metal that you can see to the limits specified above.
NOTE: For the repair procedures of the fan blade polyurethane coat, refer to Para. 4.B.
Nodules in the coat area (a nodule is a small, rounded, raised lump of coat material that can occur during the manufacturing process).	Nodules in coat must be smooth, continuous and not move with light pressure.	Permitted.
Scuff marks or streaks in the coat area (scuff marks and streaks are superficial marks caused by the coated surfaces that rub against each other).	All quantities that do not show primer or base metal.	Permitted.
Blend areas on the coat (can occur during the manufacturing process and can have a matte gray finish).	All quantities that do not show primer or base metal.	Permitted.
Coat nicks, pits and scratches.	All quantities that do not show primer or base metal.	Permitted.
Area A.	All the primer or the base metal that you can see, 1.00 in.2 (645.16 mm2) or less.	Not permitted. Repair or replace the blade in 2600 cycles. See "Area A adjacent to the blade tip". For areas more than 1.00 in.2 (645.16 mm2), see the "All Areas" section.
Area A adjacent to the blade tip.	All the primer or the base metal that you can see is not more than 0.0078 in.2 (5.03 mm2) for each side of the blade that is immediately adjacent to the blade tip. The total area does not include the plasma spray tip treatment surface area. It is not necessary for the edges of the plasma coat on the fan blade tip to have polyurethane coat.	Permitted. If the damage is not in the limits, repair or replace the blade in 2600 cycles.
Area B.	All the primer or the base metal that you can see, 1.00 in.2 (645.16 mm2) or less.	Not permitted. Repair or replace the blade in 1100 cycles. For areas more than 1.00 in.2 (645.16 mm2), see the "All Areas" section.
Area C.	All the primer or the base metal that you can see, 1.00 in.2 (645.16 mm2) or less.	Not permitted. Repair or replace the blade in 1100 cycles. For areas more than 1.00 in.2 (645.16 mm2), see the "All Areas" section.
Area D.	All the primer or the base metal that you can see.	Not permitted. If the galvanic isolation is not done or it is not checked, repair or replace the blade in five cycles. If the galvanic isolation is done, repair the blade in 35 cycles. Do a check for the galvanic isolation (Ref. AMM TASK 72-11-03-210-803).
Area E.	All the primer or the base metal that you can see, 1.00 in.2 (645.16 mm2) or less.	Not permitted. If the galvanic isolation is not done or it is not checked, repair or replace the blade in 50 cycles. If the galvanic isolation is done, repair the blade in 1100 cycles. Do a check for the galvanic isolation (Ref. AMM TASK 72-11-03-210-803). For areas more than 1.00 in.2 (645.16 mm2) and with the galvanic isolation, see the "All Areas" section.
Area E adjacent to the blade tip.	All the primer or the base metal that you can see is not more than 0.0031 in.2 (2.00 mm2) for each side of the blade that is immediately adjacent to the blade tip. The total area does not include the plasma spray tip treatment surface area.	Permitted. If not in limits and if the galvanic isolation is not done or it is not checked, repair or replace the blade in 50 cycles. If the galvanic isolation is done, repair the blade in 1100 cycles. Do a check for the galvanic isolation (Ref. AMM TASK 72-11-03-210-803).
Area E adjacent to the leading edge sheath.	All the primer that you can see and that is immediately adjacent to the leading edge sheath is not more than 0.010 in. (0.254 mm) in width and is not more than the length of the leading edge sheath.	Permitted. If not in limits and if the galvanic isolation is not done or it is not checked, repair or replace the blade in 50 cycles. If the galvanic isolation is done, repair the blade in 1100 cycles. Do a check for the galvanic isolation (Ref. AMM TASK 72-11-03-210-803).
Area X of the platform, 2.0 in. (50.8 mm) or less from the ground tab.	All the primer or the base metal that you can see.	Not permitted. If the galvanic isolation is not done or it is not checked, repair or replace the blade in 50 cycles. If the galvanic isolation is done, repair the blade in 1100 cycles. Do a check for the galvanic isolation (Ref. AMM TASK 72-11-03-210-803).
Area Y airfoil area at the trailing edge tip.	All the primer or the base metal that you can see.	Permitted. In ten cycles, cut away the coat that is lifted or has loss of bond by the requirements specified in (Ref. AMM TASK 72-11-03-320-804) (step 6).
Area Z cover transition area for bubbled coating (air bubble under polyurethane coating). Completely or partially in the cover transition area. An air bubble can have burst showing an area of coating disbond.	All quantities.	Not permitted. Contact Pratt & Whitney.

Subtask 72-11-03-320-053-A ** ON A/C NOT FOR ALL

B. Repair the polyurethane coat of the fan blade (1) as follows:
(1) Damage to the polyurethane coat that does not go through the coat and does not show the primer or the base metal is permitted. No repair is necessary (Ref. AMM TASK 72-11-03-210-802).
(2) If the damage shows the primer but does not show the base metal, do an erosion coat touch-up repair of the fan blade assembly with the P05-154coating, polyurethane, erosion resistant (Ref. AMM TASK 72-11-03-320-804).
(3) If the damage shows the primer or the base metal, do an erosion coat touch-up repair of the fan blade assembly with the epoxy (Material No.P05-492) (Ref. AMM TASK 72-11-03-320-805).
(4) For the fan blades that must be removed and replaced in Table 1 (Ref. AMM TASK 72-11-03-000-801) and (Ref. AMM TASK 72-11-03-400-801).

5. Close-up
Subtask 72-11-03-942-058-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 MAT - PROTECTIVE or the 636-1100-3GSE INLET COWL PROTECT COVER from the inlet cowl.
(3) Examine the assembly for foreign objects, damage and correct assembly.
(4) 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 all the necessary COVER - PROTECTION to prevent damage to the engine.
(5) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:02:17 UTC