Inspection of Fan Rotor Blades Installed on the Fan Disk [CFMB]

TASK 72-21-00-210-009-A
Inspection of Fan Rotor Blades Installed on the Fan Disk

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 1M(3 FT)
No specific	1	MAT - PROTECTIVE
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 70-51-00-230-002-A	Fluorescent-Penetrant Inspection-Portable-Water Washable
TASK 72-00-00-200-025-A	Over-Serviceable-Limit Extensions
TASK 72-00-00-200-025-A-01	Over-Serviceable-Limit Extensions
TASK 72-21-00-000-007-A	Removal of the Fan Rotor Blades
TASK 72-21-00-300-028-A	Replacement of Fan Rotor Blades in Pairs
TASK 72-21-00-300-029-A	Replacement of Individual Fan Blades
TASK 72-21-00-320-003-A	Blending of the Fan Rotor Blades
TASK 72-23-00-210-003-C	Detailed Inspection of Spinner, Engine Inlet, Fan Blades, Fan Outlet and Abradable Material
SPM 704111
ESM 722101
Fan Rotor Blades - Blend Limits
Fan Rotor Blades - Local Distortions

3. Job Set-up
Subtask 72-21-00-941-087-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(c) Put the ACCESS PLATFORM 1M(3 FT) in position.
(4) Install MAT - PROTECTIVE in the lower half of the inlet cowl.

4. Procedure
Subtask 72-21-00-210-059-A ** ON A/C NOT FOR ALL

A. Inspection of the fan blades (in situ, installed on the fan disk)

NOTE: If pairs of fan blades are not available as spare for replacement (Ref. AMM TASK 72-21-00-300-028), you can replace one blade individually (Ref. AMM TASK 72-21-00-300-029), when the difference between the moment weight of the blade removed and its opposite is not more than 800 cm.g (315 in.g). However, you must do the inspections and corrections given in the replacement procedure with the conditions of the referenced procedure, thus, to make sure the engine vibration is not more than the limits. This also optimizes the operation of the engine.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fan rotor blades for: A.Cracks or Tears. (1)Operational cracks.	Not serviceable.	Replace pair of matched blades (Ref. AMM TASK 72-21-00-300-028).
(2)FOD caused cracks or tears.	Not serviceable	Replace blade (Ref. AMM TASK 72-21-00-300-028) or (Ref. AMM TASK 72-21-00-300-029), or blend the defects (Ref. AMM TASK 72-21-00-320-003). You must repair blended fan blades following ESM 72-21-01 Rep 01 at first shop visit opportunity.
B.Nicks, dents and scratches on root area.	No limited quantity, if not deeper than 0.003 in. (0.08 mm).	Replace blade (Ref. AMM TASK 72-21-00-300-028) or (Ref. AMM TASK 72-21-00-300-029) (Ref. AMM TASK 72-21-00-320-003).
C.Nicks, dents and scratches on full airfoil out of midspan shroud critical area.	No limited quantity, if not deeper than 0.003 in. (0.08 mm) after removal of high metal by hand blending per SPM 704111.	Replace blade (Ref. AMM TASK 72-21-00-300-028) or (Ref. AMM TASK 72-21-00-300-029) or blend the impacted area (Ref. AMM TASK 72-21-00-320-003). You must repair blended fan blades following ESM 722101 Rep 01 at first shop visit opportunity.
D.Nicks, dents and scratches on leading edge of root area and on Area A.	No limited quantity, if not deeper than0.006 IN. (0.15 MM).	Replace blade (Ref. AMM TASK 72-21-00-300-028) or (Ref. AMM TASK 72-21-00-300-029), or blend the defects (Ref. AMM TASK 72-21-00-320-003). You must repair blended fan blades following ESM 722101 Rep 01 at first shop visit opportunity.
E.Nicks, dents and scratches on trailing edge, Area D	No limited quantity, if not deeper than 0.006 IN. (0.15 MM).	Replace blade (Ref. AMM TASK 72-21-00-300-028) or (Ref. AMM TASK 72-21-00-300-029) or blend the defects (Ref. AMM TASK 72-21-00-320-003). You must repair blended fan blades following ESM 72-21-01 Rep 01 at first shop visit opportunity.
F.Nicks, dents and scratches on leading edge in Area B.	No limited quantity, if not deeper than 0.03 in. (0.76 mm), with 0.40 in. (10.16 mm) max length for scratches after removal of high metal by hand blending per SPM 704111.	Replace blade (Ref. AMM TASK 72-21-00-300-028) or (Ref. AMM TASK 72-21-00-300-029) or blend the impacted area (Ref. AMM TASK 72-21-00-320-003). You must repair blended fan blades following ESM 72-21-01 Rep 01 at first shop visit opportunity.
G.Localized distortion on leading and trailing edges of root area, Area A.	Not serviceable.	Replace blade (Ref. AMM TASK 72-21-00-300-028) or (Ref. AMM TASK 72-21-00-300-029).
H.Leading and trailing edges distortion in Areas B and D (out of root area and area A of trailing edge).	Two areas may be distorted up to 0.34 in. (8.64 mm) out of contour provided there are no sharp corners and the minimum length L is six times the depth of the distortion. If there is distortion within serviceable limits, do a spot fluorescent-penetrant inspection (Ref. AMM TASK 70-51-00-230-002). No indication is permitted.
J.Blade tip (Area C) for: (1)Leading edge tip curl	There is not limit on the quantity of blades damaged when the tip curl does not extend more than dimension X1=0.5 IN. (13 MM) across the blade tip and not more than dimension X=0.5 IN. (13 MM), along the leading edge. Maximum deflection from original contour is dimension Y=0.25 IN. (6.35 MM). A maximum of 6 blades can have tip curl up to dimension X1=1.3 IN. (33 MM) across the blade tip and dimension X=2 IN. (51 MM) along the leading edge with maximum deflection from original contour dimension Y=0.6 IN. (15 MM). Not more than 3 blades to these increased limits can be adjacent. In all cases, deflection tip angle must not be more than 60 deg (60 deg)60 degrees from original airfoil.	Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028) No continued in-service extension is permitted. See sheet 2 of Fan Rotor Blades - Local Distortions ** ON A/C NOT FOR ALL
(2)Trailing edge tip curl.	There is not limit on the quantity of blades impacted when the tip curl does not extend more than dimension Z1 =0.5 IN. (13 MM) across the blade tip and not more than dimension Z =0.5 IN. (13 MM) with maximum deflection from original contour dimension Y1 =0.25 IN. (6.35 MM). A maximum of 5 blades can have tip curl up to dimension Z1=1 IN. (25.4 MM) across the blade tip and up to dimension Z=1 IN. (25.4 MM) along the trailing edge with maximum deflection from original contour dimension Y1=0.3 IN. (7.62 MM). No more than 3 blades to these increased limits can be adjacent.	Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028). No continued in-service extension is permitted. See sheet 2 of Fan Rotor Blades - Local Distortions ** ON A/C NOT FOR ALL
(3)Nicks and dents.	No limited quantity if not deeper than 0.04 IN. (1.02 MM) and not longer than 0.25 IN. (6.35 MM).	Replace blade (Ref. AMM TASK 72-21-00-300-028) or (Ref. AMM TASK 72-21-00-300-029) or blend the defects (Ref. AMM TASK 72-21-00-320-003). You must repair blended fan blades following ESM 72-21-01 Rep 01 at first shop visit opportunity.
K.Nicks, dents and scratches on surface of blade platform (excluding fillet and recess area).	For scratches: no limited quantity, if not deeper than0.02 IN. (0.5 MM) and not longer than 0.40 IN. (10.16 MM). For nicks and dents, no limit on diameter after removal of high metal by hand blending per SPM 704111.	Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028).
L.Pits	No limited quantity if not deeper than 0.005 IN. (0.13 MM). No limits as regards diameter or spacing.	Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028).

M.Shingled midspan shrouds. NOTE: Shingled means that the midspan shrouds are still overlapped.	Not serviceable.	Refer to over-serviceable-limit extensions (Ref. AMM TASK 72-00-00-200-025).
N.High metal caused by shingling on midspan shroud. NOTE: Shingling means that an overlap between midspan shrouds occurred, but the midspan shrouds are no longer overlapped.	Any amount after smoothing of high metal by hand blending per SPM 704111.
P.Wear due to shingling on midspan shroud. NOTE: Shingling means that an overlap between midspan shrouds occurred, but the midspan shrouds are no longer overlapped.	Any amount up to 0.005 IN. (0.13 MM) deep.	Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028).
Q.Fan blade(s) tip seizure in fan case abradable shroud	Not serviceable.	Release the blade(s) with hand force to move the seized blade(s) tip forward and circumferentially. Then, do an inspection of the blade(s) as told in this procedure and abradable shroud (Ref. AMM TASK 72-23-00-210-003) for serviceability. Make sure that there is free rotation of N1 rotor system.

Subtask 72-21-00-010-064-A ** ON A/C NOT FOR ALL

B. If necessary, remove the fan blades for full inspection (Ref. AMM TASK 72-21-00-000-007)

5. Close-up
Subtask 72-21-00-410-066-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) Remove the MAT - PROTECTIVE from the inlet cowl.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:41:14 UTC