Inspection of the Fan Rotor Blades Removed from the Fan Disk [CFMB]

TASK 72-21-00-210-006-A
Inspection of the Fan Rotor Blades Removed from the Fan Disk

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

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)
No specific	AR	WARNING NOTICE(S)
856A5817	1	TOOL,CHECK-FAN BLADE SHANK

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-51-00-230-002-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 72-21-00-210-804-A	Detailed Inspection and Relubrication of the Fan Blade Dovetails, Midspan Shrouds, Spacers, Platforms and Fan Disk Dovetail Slots
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 72-21-00-400-007-A	Installation of the Fan Rotor Blades
SPM 704111
ESM 722101
Fan Rotor Blades - Blend Limits
Fan Rotor Blades - Local Distortions

3. Job Set-up
Subtask 72-21-00-941-080-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on 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 an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 72-21-00-210-056-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. Full Inspection of the Fan Blades (Removed from the Fan Disk)

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

NOTE: The removal of the fan blades is necessary to do a full inspection of those blades (Ref. AMM TASK 72-21-00-000-007).

NOTE: If pairs of fan blades are not available as spares 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 removed blade and its opposite is not more than 800 cm.g (315 in.g). However, you must do the inspections and the corrections given in the replacement procedure with the conditions of the referenced procedure. This is to make sure that 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 the pair of matched blades (Ref. AMM TASK 72-21-00-300-028).
(2)Cracks or tears caused by Foreign Object Damage (FOD).	Not serviceable.	Replace the 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 the blended fan blades following ESM 72-21-01 Rep 01 at the first shop visit opportunity.
B.Nicks, dents and scratches on the root area.	No limited quantity if not deeper than 0.003 in. (0.08 mm).	Replace the blade (Ref. AMM TASK 72-21-00-300-028) or (Ref. AMM TASK 72-21-00-300-029).
C.Nicks, dents and scratches on the full airfoil out of the midspan shroud critical area.	No limited quantity if not deeper than 0.003 in. (0.08 mm) after the removal of the high metal by hand blending per SPM 704111.	Replace the 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 the blended fan blades following ESM 722101 Rep 01 at the first shop visit opportunity.
D.Nicks, dents and scratches on the leading edge of the root area and on Area A.	No limited quantity if not deeper than 0.006 in. (0.15 mm).	Replace the 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 the blended fan blades following ESM 722101 Rep 01 at the first shop visit opportunity.
E.Nicks, dents and scratches on the trailing edge, Area D.	No limited quantity if not deeper than 0.006 in. (0.15 mm).	Replace the 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 the blended fan blades following ESM 72-21-01 Rep 01 at the first shop visit opportunity.
F.Nicks, dents and scratches on the leading edge in Area B.	No limited quantity if not deeper than 0.03 in. (0.76 mm), with a max length of 0.40 in. (10.16 mm) for the scratches after the removal of the high metal by hand blending per SPM 704111.	Replace the 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 the blended fan blades following ESM 72-21-01 Rep 01 at the first shop visit opportunity.
G.Localized distortion on the leading and trailing edges of the root area, Area A.	Not serviceable.	Replace the 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 the root area and area A of the trailing edge).	Two areas may be distorted up to 0.34 in. (8.64 mm) out of the contour, provided there are no sharp corners and 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 no limit on the quantity of impacted blades 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. The maximum deflection from the original contour is dimension Y = 0.25 in. (6.35 mm).	Replace the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028). No continued in-service extension is permitted. Fan Rotor Blades - Local Distortions ** ON A/C NOT FOR ALL
	A maximum of 6 blades can have a 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 a maximum deflection from original contour dimension Y = 0.6 in. (15 mm). No more than 3 blades to these increased limits can be adjacent. In all cases, the deflection tip angle must not be more than 60 degrees from the original airfoil.	Replace the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028). No continued in-service extension is permitted. Fan Rotor Blades - Local Distortions ** ON A/C NOT FOR ALL
(2)Trailing edge tip curl.	There is no limit on the quantity of impacted blades 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 the leading edge, with a maximum deflection from original contour dimension Y1 = 0.25 in. (6.35 mm).	Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028). No continued in-service extension is permitted. Fan Rotor Blades - Local Distortions ** ON A/C NOT FOR ALL
	A maximum of 5 blades can have a 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 a 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 the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028). No continued in-service extension is permitted. 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 no longer than 0.25 in. (6.35 mm).	Replace the blade (Ref. AMM TASK 72-21-00-300-028) and (Ref. AMM TASK 72-21-00-300-029), or blend the defects (Ref. AMM TASK 72-21-00-320-003). You must repair the blended fan blades following ESM 72-21-01 Rep 01 at the first shop visit opportunity.
K.Nicks, dents and scratches on the surface of the blade platform (excluding the 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. (10.16 mm). For nicks and dents, no limit on the diameter after the removal of the high metal by hand blending per SPM 704111.	Replace the blade (Ref. AMM TASK 72-21-00-300-028) and (Ref. AMM TASK 72-21-00-300-029).
L.Missing Molydag coating on the dovetail pressure faces:	Missing Molydag coating is permitted on 100 percent of the surface if the parent material is not damaged.	Fan Rotor Blades - Local Distortions ** ON A/C NOT FOR ALL
(1)Worn or missing Cu.Ni.In coating in the non-contact area (Area 1).	Any amount if the parent material is not damaged.
(2)Worn or missing Cu.Ni.In coating in the contact area (Area 2) of the dovetail pressure face.	Flaking of Cu.Ni.In up to 10 percent is permitted if the coating adherence is correct in the adjacent areas and if there is no evidence of wear on the base material.	See the over-serviceable-limit extension (Ref. AMM TASK 72-00-00-200-025) and examine the blades for serviceability. Make sure that a MoS2 dry film lubricant is applied to the disk slots, the blade roots (dovetails), the blade platforms and the lateral surfaces of those platforms, and the midspan shroud mating surfaces before the blade installation (Ref. AMM TASK 72-21-00-210-804).
	Flaking of Cu.Ni.In over 10 percent and less than 50 percent is permitted if the coating adherence is correct in the adjacent areas and if there is no evidence of wear on the base material.	See the over-serviceable-limit extension (Ref. AMM TASK 72-00-00-200-025) and examine blades for serviceability. Make sure that a MoS2 dry film lubricant is applied to the disk slots, the blade roots (dovetails), the blade platforms and the lateral surfaces of those platforms, and the midspan shroud mating surfaces before the blade installation (Ref. AMM TASK 72-21-00-210-804).
M.Missing coating on the inner faces of the platform.	Any amount.
N.Fretting on the dovetail pressure faces.	Not serviceable.	Replace the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028).
P.Nicks, dents and scratches in the dovetail fillet radius.	Not serviceable.	Replace the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028).
Q.Pits.	No limited quantity if not deeper than 0.005 in. (0.13 mm). No limits as regards the diameter or the spacing.	Replace the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028).
R.Nicks, dents and scratches on the midspan shroud.	No limited quantity if not deeper than 0.010 in. (0.25 mm). No limited length for the scratches, and 0.5 in. (12.7 mm) diameter for the dents. None permitted in the midspan shroud critical area.	Replace the 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 the blended fan blades following ESM 72-21-01 Rep 01 at the first shop visit opportunity.
S.Missing hard coating from the midspan shroud not exceeding 10 percent of the midspan shroud mating face.	Flaking of the hard coating is permitted if the coating adherence is correct in the adjacent areas.
Missing hard coating from the midspan shroud exceeding 10 percent but less than 20 percent of the midspan shroud mating face.	Flaking of the hard coating is permitted if the coating adherence is correct in the adjacent areas.	Monitor every 1500 cycles. Remove and examine the blades for serviceability (Ref. AMM TASK 72-21-00-000-007). Make sure that a MoS2 dry film lubricant is applied to the disk slots, the blade roots (dovetails), the blade platforms and the lateral surfaces of those platforms, and the midspan shroud mating surfaces before the blade installation (Ref. AMM TASK 72-21-00-400-007).
Missing hard coating from the midspan shroud exceeding 20 percent of the midspan shroud mating face.	Not serviceable.	See the over-serviceable-limit extensions (Ref. AMM TASK 72-00-00-200-025).
T.Wear due to shingling on the midspan shroud. NOTE: Shingling means that an overlap between the midspan shrouds occurred, but the midspan shrouds are no longer overlapped.	Any amount up to 0.005 in. (0.13 mm) deep.	Replace the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028).
U.High metal caused by shingling on the midspan shroud. NOTE: Shingling means that an overlap between the midspan shrouds occurred, but the midspan shrouds are no longer overlapped.	Any amount after smoothing of the high metal by hand blending per SPM 704111.
WARNING: YOU MUST CLEAN THE FAN BLADE SHANKS WITH ISOPROPYL ALCOHOL (MATERIAL No. CP1041) BEFORE YOU DO THE INSPECTION. V.Fretting on: NOTE: It is necessary to do the wear depth measurement on all the fan blade shanks with the 856A5817 TOOL,CHECK-FAN BLADE SHANK.
(1)Aft side of the shank.	No limit if not deeper than 0.003 in. (0.08 mm).	Replace the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028). Fan Rotor Blades - Local Distortions ** ON A/C NOT FOR ALL
(2)Lateral sides of the shank	No limit if not deeper than 0.012 in. (0.30 mm) (concave side) and 0.012 in. (0.30 mm) (convex side) on the area referenced by X for the length and Y for the width.	Replace the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028). Fan Rotor Blades - Local Distortions ** ON A/C NOT FOR ALL
(3)Forward face of the dovetail.	No limit if not deeper than 0.003 in. (0.08 mm).	Replace the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028).
(4)Slide edges of the platform.	No limit if not deeper than 0.013 in. (0.33 mm).	Replace the pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-028).
W.Shingled midspan shrouds. NOTE: Shingled means that the midspan shrouds are still overlapped.	Not serviceable.	See the over-serviceable-limit extensions (Ref. AMM TASK 72-00-00-200-025).
X.Seizure of fan blade tip(s) in the fan case abradable shroud.	Not serviceable.	Release the blade(s) with hand force to move the seized blade tip(s) forward and circumferentially. Then, do an inspection of the blade(s) and the abradable shroud for serviceability. Make sure that there is a free N1 rotation.

5. Close-up
Subtask 72-21-00-210-064-A ** ON A/C NOT FOR ALL

A. Before fan blade installation, do the relubrication of the fan blade spacers, dovetails, platforms, midspan shrouds and fan disk dovetail slots (Ref. AMM TASK 72-21-00-210-804).

Subtask 72-21-00-942-075-A ** ON A/C NOT FOR ALL

B. 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 WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 02:41:15 UTC