DOC AIRBUS | AMM A320FInspect Fan Rotor Blades Removed from the Fan Disk [CFMI]
TASK 72-21-00-210-002-A
Inspect Fan Rotor Blades Removed from the Fan Disk
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 72-21-00-941-051-A ** ON A/C NOT FOR ALL
Subtask 72-21-00-210-051-A ** ON A/C NOT FOR ALL
5. Close-up
Subtask 72-21-00-410-058-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 07:32:28 UTC
Inspect Fan Rotor Blades Removed from 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 | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| 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 72-21-00-210-004-A | Detailed Inspection and Relubrication of Fan Blade Dovetails, Midspan Shrouds, Retainers, Spacers, Dampers and Fan Disk Dovetail Slots |
| 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 |
Stage 1 Fan Rotor Blades - Blend LimitsSubtask 72-21-00-941-051-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).
4. Procedure(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).
Subtask 72-21-00-210-051-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 Visual Inspection of the Fan Blades (Removed from Fan Disk) NOTE: The removal of the fan blades is necessary to do a full inspection of these blades (Ref. AMM TASK 72-21-00-000-003).
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). Remove0.010 IN. (0.25 MM) of additional material. Total blend must agree with the max repair limits as defined in figure. |
| B.Nicks, dents and scratches on contour surfaces of root area, Areas A and C. | No limited quantity if no deeper than 0.003 IN. (0.08 MM) after removal of high metal by hand blending per | 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 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 | 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 | 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 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). No more than 3 blades to these increased limits can be adjacent. In all cases, deflection tip angle must not be more than 60 deg. from original airfoil. | Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-026). No continued in-service extension is permitted. |
| (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 than 0.04 IN. (1 MM) and no 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 | Do blending procedure (Ref. AMM TASK 72-21-00-320-001) |
| K.Missing Molydag coating on dovetail pressure faces | Missing Molydag coating is permitted on 100 percent of the surface if parent material is not damaged | |
| (1)Worn or missing Cu.Ni.In coating in the non-contact area (Area 1) | Any amount if 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 coating adherence is correct in adjacent areas and if there is no evidence of wear on base material. | Refer to Over-Serviceable-Limit Extensions (Ref. AMM TASK 72-00-00-200-005) and examine blades for serviceability. Make sure that MoS2 dry film lubricant is applied to disk slots, the blade roots (dovetails), the blade platforms and lateral surfaces of those platforms, and the midspan shroud mating surfaces before blade installation (Ref. AMM TASK 72-21-00-210-004). |
| | Flaking of Cu.Ni.In over 10 percent and less than 50 percent is permitted if coating adherence is correct in adjacent areas and if there is no evidence of wear on base material. | Refer to Over-Serviceable-Limit Extensions (Ref. AMM TASK 72-00-00-200-005) and examine blades for serviceability. Make sure that MoS2 dry film lubricant is applied to disk slots, the blade roots (dovetails), the blade platforms and lateral surfaces of those platforms, and the midspan shroud mating surfaces before blade installation (Ref. AMM TASK 72-21-00-210-004). |
| L.Missing coating on inner faces of platform | Molydag missing on 75 percent of area | Refer to Over-Serviceable-Limit Extensions (Ref. AMM TASK 72-00-00-200-005) |
| M.Fretting on dovetail pressure faces | Not serviceable | Replace pair of blades (Ref. AMM TASK 72-21-00-300-026) |
| N.Nicks, dents and scratches in dovetail fillet radius | Not serviceable | Replace pair of blades (Ref. AMM TASK 72-21-00-300-026) |
| P.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 72-21-00-300-026) |
| Q.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) |
| R.Pitting, wear or missing hard coat from midspan shroud (Area C) | If no visible sign of wear extends through hard coat, flaking is permitted on 10 percent of the surface. No cracking or crazing permitted. | Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-026) |
| S.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 if not in the limits (Ref. AMM TASK 72-21-00-300-026) |
| T.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 | |
| U.Fretting on: | | |
| (1)Aft side of shank | No limit if not deeper than 0.003 IN. (0.08 MM) | Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-026) |
| (2)Forward face of dovetail. | No limit if not deeper than 0.003 IN. (0.08 MM) | Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-026) |
| (3)Slide edges of platform. | No limit if not deeper than 0.013 IN. (0.33 MM) | Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-026) |
| (4)Contact area with dampers under platform | Any amount up to 0.004 IN. (0.10 MM) | |
| (5)Fretting wear on lateral side of the shank | No limit if not deeper than 0.004 IN. (0.10 MM) | Replace pair of blades if not in the limits (Ref. AMM TASK 72-21-00-300-026) |
| V.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) |
| W.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. |
| X.Fan blade(s) midspan shrouds radii for erosion. | Any amount. | |
Subtask 72-21-00-410-058-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).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).