Inspect Fan Rotor Blades Installed on the Fan Disk [CFMI]

TASK 72-21-00-210-025-A
Inspect Fan Rotor Blades Installed on the Fan Disk

ZONE: 400

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)-ADJUSTABLE
No specific	1	MAT - PROTECTIVE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-51-00-230-001-A	Fluorescent-Penetrant Inspection-Portable Water-Washable
TASK 72-00-00-200-005-A	Over-Serviceable-Limit Extensions
TASK 72-21-00-000-003-A	Removal of the Fan Rotor Blades
TASK 72-21-00-300-026-A	Replacement of Fan Rotor Blades in Pairs
TASK 72-21-00-300-027-A	Replacement of Individual Fan Blade
TASK 72-21-00-320-001-A	Blending of First Stage Fan Blades.
TASK 72-21-00-400-003-A	Installation of the Fan Rotor Blades
SPM 704111
Stage 1 Fan Rotor Blades - Blend Limits
Fan Rotor Blades-Local Distortions

3. Job Set-up
Subtask 72-21-00-941-088-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 to tell persons not to energize the FADEC 1(2).
(4) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
(5) Install MAT - PROTECTIVE in the lower half of the inlet cowl.

4. Procedure
Subtask 72-21-00-210-060-A ** ON A/C NOT FOR ALL

CAUTION: DO NOT CLEAN TITANIUM PARTS WITH COMPOUNDS WHICH CONTAIN HALOGEN. HALOGEN DECREASES THE STRENGTH OF TITANIUM.

A. Inspection of the Fan Blades (in Situ, Installed on the Fan Disk)

Stage 1 Fan Rotor Blades - Blend Limits ** ON A/C NOT FOR ALL

Fan Rotor Blades-Local Distortions ** ON A/C NOT FOR ALL

NOTE: The removal of the fan blades is not necessary to do this inspection of the fan blades.

NOTE: If pairs of fan blades are not available as spare for replacement (Ref. AMM TASK 72-21-00-300-026), you can replace only one blade (Ref. AMM TASK 72-21-00-300-027) with a difference between the moment weight of the blade removed and its opposite that is no more than 800 cm.g (315 in.g). Also, you must do the inspections and corrections given in the replacement procedure with the above procedure to make sure that the engine vibration is not more than the limits. This also makes better 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 72-21-00-300-026).
(2)FOD caused cracks or tears.	Not serviceable.	Do blending procedure (Ref. AMM TASK 72-21-00-320-001) until all indications are removed. Do a spot fluorescent-penetrant inspection to make sure that all indications are removed (Ref. AMM TASK 70-51-00-230-001). Remove 0.01 IN. (0.25 MM) of additional material. Total blend must agree with the max repair limits as defined in figure Stage 1 Fan Rotor Blades - Blend Limits ** ON A/C NOT FOR ALL
B.Nicks, dents and scratches on contour surfaces of root area, Areas A and C.	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 72-21-00-000-003) and (Ref. AMM TASK 72-21-00-400-003) or blend the defects if damage is within the blending limit of figure Stage 1 Fan Rotor Blades - Blend Limits ** ON A/C NOT FOR ALL and (Ref. AMM TASK 72-21-00-320-001).
C.Nicks, dents and scratches on leading and trailing edges of root area, Areas A and C.	No limited quantity, if not deeper than 0.006 IN. (0.15 MM).	Do blending procedure (Ref. AMM TASK 72-21-00-320-001) .
D.Nicks, dents and scratches on contour surfaces of Areas B and D.	No limited quantity, if not deeper than 0.015 IN. (0.4 MM) with 0.40 IN. (10.2 MM) max. length for scratches after removal of high metal by hand blending per SPM 704111.	Do blending procedure (Ref. AMM TASK 72-21-00-320-001).
E.Nicks, dents and scratches on leading and trailing edges in Areas B and D.	No limited quantity in Area D if not deeper than 0.04 IN. (1 MM) and/or no limited quantity in Area B if not deeper than 0.03 IN. (0.76 MM) with 0.40 IN. (10.2 MM) max. length for scratches after removal of high metal by hand blending per SPM 704111.	Do blending procedure (Ref. AMM TASK 72-21-00-320-001).
F.Localized distortion on leading and trailing edges of root area, Areas A and C.	Not serviceable	Replace blade (Ref. AMM TASK 72-21-00-000-003) and (Ref. AMM TASK 72-21-00-400-003)
G.Leading and trailing edges distortion in Areas B and D.	Two areas may be distorted up to 0.34 IN. (8.6 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 70-51-00-230-001). No indication is permitted.
H.Blade tip for: (1)Leading edge tip curl.	There is not limit on the quantity of blades impacted 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 leading edge. Maximum deflection from original contour is dimension Y = 0.25 in. (6.35 mm).	Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-026). No continued in-service extension is permitted.
	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).	Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-026). No continued in-service extension is permitted.
	No more than 3 blades to these increased limits can be adjacent. In all cases, deflection tip angle must not be more than 60 degrees from original airfoil.
(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) along leading edge. Maximum deflection from original contour is dimension Y1 = 0.25 in. (6.35 mm).	Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-026). No continued in-service extension is permitted.
	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. (7.6 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 72-21-00-300-026). No continued in-service extension is permitted.
(3)Nicks and dents.	No limited quantity if not deeper than0.04 IN. (1 MM) and not longer than 0.25 IN. (6.3 MM).	Do blending procedure (Ref. AMM TASK 72-21-00-320-001). Do a spot fluorescent-penetrant inspection (Ref. AMM TASK 70-51-00-230-001).
J.Nicks, dents and scratches on surface of blade platform (excluding fillet and recess area).	For scratches: No limited quantity, if not deeper than 0.02 IN. (0.5 MM) and not longer than 0.40 IN. (10.2 MM). For nicks and dents, no limit on diameter after removal of high metal by hand blending per SPM 704111.	Do blending procedure (Ref. AMM TASK 72-21-00-320-001).
K.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 (Ref. AMM TASK 72-21-00-300-026).
L.Nicks, dents and scratches on midspan shroud (Area C).	No limited quantity if not deeper than 0.010 IN. (0.25 MM). No limited length for scratches and 0.5 IN. (12.7 MM) diameter for dents. None permitted in midspan shroud to airfoil fillet radius.	Do blending procedure (Ref. AMM TASK 72-21-00-320-001).
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 72-00-00-200-005).
N.High metal caused by shingling on midspan shroud (Area c). 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 (Area C). 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 (Ref. AMM TASK 72-21-00-300-026).
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) and abradable shroud for serviceability. Make sure that there is free N1 rotation.

Subtask 72-21-00-010-065-A ** ON A/C NOT FOR ALL

B. If necessary, remove the fan blades for full inspection (Ref. AMM TASK 72-21-00-000-003)

5. Close-up
Subtask 72-21-00-410-067-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 WARNING NOTICE(S).
(3) Remove the MAT - PROTECTIVE from the inlet cowl.
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 02:38:08 UTC