Visual Examination of the Fan Blade for Bends and Curls [PW11]

TASK 72-11-03-220-801-A
Visual Examination of the Fan Blade for Bends and Curls

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.

ZONE: 400

1. Reason for the Job
Use this procedure to visually examine the fan blades for bends and curls.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	GLOVES - PROTECTIVE
636-1100-3GSE	1	INLET COWL PROTECT COVER

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	lint-free cotton cloth

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 72-11-03-320-801-A	Blend Repair of the Fan Blade Leading Edge (LE)
TASK 72-11-03-320-805-A	Do an Erosion Coat Touch-Up Repair of the Fan Blade Assembly - Base Coat
TASK 72-11-03-700-801-A	Adhesion Acceptance Test of the Fan Blade Coat at Leading-Edge Sheath Interface (Manual Test)
Visual Examination of the Fan Blade for Bends and Curls

3. Job Set-up
Subtask 72-11-03-941-050-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).

4. Procedure
Subtask 72-11-03-220-050-A ** ON A/C NOT FOR ALL

A. Visual Examination of the Fan Blade for Bends and Curls

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

(1) Do this procedure when you think there is Foreign Object Damage (FOD).

NOTE: For this visual inspection, it is only necessary to examine the visible portions of the installed fan blades. If you think that there is damage in the area below the ID flow path, you may remove the inlet cone or fan blade to examine as necessary.

(2) Use this procedure to visually examine the fan blades for bends and curls:

NOTE: A curl is a small bend.

(a) Put an 636-1100-3GSE INLET COWL PROTECT COVER or equivalent in the air inlet cowl.

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.

(b) Wear GLOVES - PROTECTIVE when you touch the blades.

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.

(c) For this visual examination procedure, the permitted damage limits for the fan blade bends and curls are listed in Table 601.
(d) Wipe the fan blade(s) with a lint-free cotton cloth (Material No.P05-005) , if nescessary.

(e) To find the original/not damaged blade profile, compare to adjacent areas or in the same area on a new or not damaged fan blade.
(f) If a blade is removed from service because of large bends or curls, you can possibly repair it and put the repaired blade back in service. Contact Pratt & Whitney.

Table 601: Visual Examination of the Fan Blade - Bends and Curls

EXAMINE	DAMAGE	DISPOSITION
Blade tip for bends, curls, cracks or tears:
Area A:	Tip bend or curl only with dimension M not more than 0.125 in. (3.175 mm) maximum. No separation between leading edge sheath and blade body. Damage not more than five blades or a maximum of three adjacent blades.	Permitted
Area A:	Tip bend or curl only with dimension M more than 0.125 in. (3.175 mm). No separation between leading edge sheath and blade body. Damage not more than five blades or a maximum of three adjacent blades.	Not permitted. Remove the blade within five cycles or if possible, do a blend repair (Ref. AMM TASK 72-11-03-320-801) to remove the bends and curls. If blend was done, do a fluorescent penetrant inspection (Ref. AMM TASK 72-11-03-700-801).
Area A:	Tip bend or curl with cracks or tears	Not permitted. Remove the blade within five cycles or if possible, do a blend repair (Ref. AMM TASK 72-11-03-320-801) to remove the bends, curls, and cracks or tears. If blend was done, do a fluorescent penetrant inspection (Ref. AMM TASK 72-11-03-700-801).
Area B:	Tip bend or curl only with dimension M not more than 0.125 in. (3.175 mm)	Permitted
Area B:	Tip bend or curl only with dimension M more than 0.125 in. (3.175 mm)	Not permitted. Remove blade within five cycles.
Area B:	Tip bend or curl with cracks or tears	Not permitted. Remove the blade within five cycles or if possible, do a blend repair (Ref. AMM TASK 72-11-03-320-801) to remove the bends, curls, and cracks or tears. If blend was done, do the fluorescent penetrant inspection (Ref. AMM TASK 72-11-03-700-801) and do an erosion touch-up coat (Ref. AMM TASK 72-11-03-320-805).
Leading edge or trailing edge for bends, curls, cracks or tears:
Area C:	Trailing edge bends or curls only with dimension N not more than 0.060 in. (1.524 mm) maximum	Permitted
Area C:	Trailing edge bends or curls with dimension N more than 0.060 in. (1.524 mm) and not more than 0.125 in. (3.175 mm)	Not permitted. Remove from service in 50 cycles.
Area C:	Trailing edge bends or curls only with dimension N more than 0.125 in. (3.175 mm)	Not permitted. Remove from service immediately.
Area C:	Trailing edge bends or curls with cracks or tears	Not permitted. Remove the blade from service immediately.
Area E:	Leading edge bend or curl only with dimension N not more than 0.125 in. (3.175 mm) maximum	Permitted
Area E:	Leading edge bend or curl only with dimension N more than 0.125 in. (3.175 mm) maximum	Not permitted. Remove the blade immediately or if possible, do a blend repair (Ref. AMM TASK 72-11-03-320-801) to remove all bends or curls. If blend was done, do a fluorescent penetrant inspection (Ref. AMM TASK 72-11-03-700-801).
Area D or F:	Leading edge bend or curl only with dimension N not more than 0.060 in. (1.524 mm) maximum	Permitted
Area D or F:	Leading edge bend or curl with dimension N more than 0.060 in. (1.524 mm) and not more than 0.125 in. (3.175 mm)	Not permitted. Remove the blade in 50 cycles or if possible do a blend repair (Ref. AMM TASK 72-11-03-320-801) to remove all bends or curls. If blend was done, do a fluorescent penetrant inspection (Ref. AMM TASK 72-11-03-700-801).
Area D or F:	Leading edge bend or curl only with dimension N more than 0.125 in. (3.175 mm)	Not permitted. Remove the blade immediately or if possible do a blend repair (Ref. AMM TASK 72-11-03-320-801) to remove all bends or curls. If blend was done, do a fluorescent penetrant inspection (Ref. AMM TASK 72-11-03-700-801).
Area D, E or F:	Leading edge bends or curls with cracks or tears	Not permitted. Remove the blade in five cycles or if possible do a blend repair (Ref. AMM TASK 72-11-03-320-801) to remove all bends, curls or cracks. If blend was done, do a fluorescent penetrant inspection (Ref. AMM TASK 72-11-03-700-801).

(g) Remove the 636-1100-3GSE INLET COWL PROTECT COVER from the air inlet cowl.
(3) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 72-11-03-860-050-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.

[Rev.10 from 2021] 2026.04.01 13:02:16 UTC