W DOC AIRBUS | AMM A320F

Visual Inspection of the Fan Case [CFML]

TASK 72-23-01-210-801-A
Visual Inspection of the Fan Case

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
This procedure gives the criteria for the visual inspection of the fan case.
NOTE: The inspection criteria below are applicable after the removal of the high metal or fray carbon with hand blending.
NOTE: You can use equivalent alternatives for standard tools, equipment and consumable materials.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific
AR
WARNING NOTICE(S)
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
400
POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 71-13-00-010-803-A
Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A
Closing of the Fan Cowl Doors
TASK 72-21-20-000-801-A
Removal of the Fan Blades
TASK 72-21-20-400-801-A
Installation of the Fan Blades
TASK 72-23-01-300-801-A
Fan Case - Acoustic Shroud Bracket and/or its Attachment Parts Replacement
TASK 72-23-01-300-802-A
Local Repair of the Fan Case Abradable Liner
TASK 72-23-01-300-803-A
Fan Case Trench Filler Impact Repair by Material Filling
F Acceptable Deviations
F Fan Case
F Surface Porosity
F Etched Composite Surface
F Glass Fiber Coating Area
F Glass Fiber Reworked Area
F Outer Diameter of A1 Flange and B2 Flange
F A1 Flange
F Inner Radius of A1 Flange and B2 Flange
F Inner Skin and Outer Skin of Fan Case
F Adhesive Porosities in Adhesive Flash
F Flow Path and Edges of Trench Filler
F Brackets
F Abradable Riddling with Impacts
F Flow Path and Edges of Trench Filler
3. Job Set-up
Subtask 72-23-01-941-050-A
A. Safety Precautions
   (1) On the center pedestal, on ENG panel 115VU:
     (a) Make sure that the ENG/MODE selector switch is in the NORM position.
     (b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
     (c) Put a WARNING NOTICE(S) in position to tell persons not to operate:
  • The ENG/MODE selector switch
  • The ENG/MASTER 1(2) control switch.
   (2) On the ENG section of maintenance panel 50VU:
     (a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
     (b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 72-23-01-010-050-A
B. Get Access
   (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
   (2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
4. Procedure
Subtask 72-23-01-020-050-A
A. Remove the sufficient number of fan blades to clearly inspect the zone (Ref. AMM TASK 72-21-20-000-801).
Subtask 72-23-01-210-050-A
B. Visual Inspection of the Fan Case
F Acceptable Deviations
F Fan Case
F Surface Porosity
F Etched Composite Surface
F Glass Fiber Coating Area
F Glass Fiber Reworked Area
F Outer Diameter of A1 Flange and B2 Flange
F A1 Flange
F Inner Radius of A1 Flange and B2 Flange
F Inner Skin and Outer Skin of Fan Case
F Adhesive Porosities in Adhesive Flash
F Flow Path and Edges of Trench Filler
F Brackets
F Abradable Riddling with Impacts
F Flow Path and Edges of Trench Filler
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Visual inspection of all areas:


A.Surface porosity
F Surface Porosity
Any amount

B.Etched composite surface
F Etched Composite Surface
Not serviceable

C.Coloration etched composite surface
F Glass Fiber Coating Area
Any amount

D.Resin rich area
F Acceptable Deviations
Any amount

E.Buckling of the carbon tows
F Acceptable Deviations
Any amount

2.Visual inspection of the glass fiber coating area (2):
F Glass Fiber Coating Area


A.Cracks, tears in the glass fiber protective plies or missing the protective plies area
Permitted if:
  • Not more than 0.62 in.2 (400.00 mm2) for each indication
  • 7.87 in. (199.90 mm) minimum distance between two indications
  • Not more than 6.20 in.2 (3999.99 mm2) in cumulative surface

B.Delamination of the glass fiber protective plies
Permitted if:
  • Not more than 0.62 in.2 (400.00 mm2) for each indication
  • 7.87 in. (199.90 mm) minimum distance between two indications
  • Not more than 6.20 in.2 (3999.99 mm2) in cumulative surface

C.Fretting of the glass fiber protective plies
Any number of indications if:
  • Not more than 0.004 in. (0.10 mm) in depth
  • Not more than 0.62 in.2 (400.00 mm2) for each indication
  • 7.87 in. (199.90 mm) minimum distance between two indications

D.Crazing, scratches
Any amount, if not more than 0.004 in. (0.10 mm) in depth

E.Missing or disbond RTV on the glass fiber reworked area
Permitted if:
  • Maximum surface per fiber glass reworked area: 0.620 in.2 (400.00 mm2)
  • Minimal distance between two indications: 7.874 in. (200.00 mm)
  • Cumulative surface: 6.200 in.2 (3999.99 mm2)
F.Nicks, dents, scratches on RTV in the glass fiber reworked area
Permitted:
If depth (D) is more than 0.0039 in. (0.10 mm)
  • No carbon visible
  • Single impacted surface: 0.620 in.2 (400.00 mm2)
  • Minimal distance between two impacted surfaces: 7.874 in. (200.00 mm)
  • Minimal distance with missing or disbond RTV area: 7.874 in. (200.00 mm)
  • Cumulative surface: 6.200 in.2 (3999.99 mm2)
If depth (D) is less than or equal to 0.0039 in. (0.10 mm)
  • Cumulative surface impacted: 7.750 in.2 (4999.99 mm2)
3.Visual inspection of the outer diameter of A1 flange (3) and the outer diameter of B2 flange (4):
F Outer Diameter of A1 Flange and B2 Flange


A.Nicks, dents, scratches
  • Depth less than or equal to 0.031 in. (0.79 mm) if black composite material is visible
  • Any depth if black composite is not visible
  • Length less than or equal to 3.94 in. (100.08 mm)
  • Cumulative length less than or equal to 11.81 in. (299.97 mm)
  • Distance between two indications less than or equal to 14.17 in. (0.36 m)
B.Nicks, dents, scratches
Carbon visible
On the A1 flange:
  • 0.028 in. (0.71 mm) in depth
  • 3.94 in. (100.08 mm) in length
  • 14.17 in. (0.36 m) minimum distance between two indications
  • 11.81 in. (299.97 mm) in cumulative length
On the B2 flange:
  • Not serviceable

4.Visual inspection of the edge between the forward face and outer diameter of the A1 and B2 Flanges.


A.Nicks, dent, scratches
  • Depth less than or equal to 0.031 in. (0.79 mm) if black composite material is visible
  • Any depth if black composite is not visible
  • Length less than or equal to 3.94 in. (100.08 mm)
  • Distance between two indications less than or equal to 14.17 in. (0.36 m)
  • Number of indications: 10 per flanges

5.Visual inspection of the forward face of A1 flange (5):
F A1 Flange


NOTE: This surface is only visible when the inlet is disassembled from the engine.


A.Nicks, dents, scratches
  • Depth: black composite must not be visible
  • 3.94 in. (100 mm) in length
  • 39.37 in. (1 m) in cumulative length

B.Elongated the fastening holes on the inner diameter
  • Longest dimension: 0.610 in. (15.49 mm) (nominal diameter: 0.4118 in. (10.46 mm))
  • Minimum distance between two elongated holes (more than two consecutive fastening holes on the inner diameter): 15.75 in. (0.40 m)
C.Elongated the locating holes on the inner diameter
NOTE: On A1 flange, there are the two locating holes (No. 1 and No. 14).
F Fan Case
Longest dimension: 0.4024 in. (10.22 mm) (nominal diameter: 0.3980 in. (10.11 mm))

D.Elongated the brackets attachment holes on the outer diameter
Longest dimension: 0.51 in. (12.95 mm) (nominal diameter: 0.2760 in. (7.01 mm))

E.Elongated the brackets attachment counterbore on the outer diameter
Longest dimension: 0.689 in. (17.50 mm) (nominal diameter: 0.571 in. (14.50 mm))

6.Visual inspection of the forward face of A1 flange around the bolt holes
F A1 Flange


A.Fraying at the bolt hole edges, resin missing
0.04 in. (1.02 mm) around the bolt hole on the whole hole inner face

7.Visual inspection of the aft face of A1 flange around the bolt holes:


A.Fretting
0.0098 in. (0.25 mm) in depth over 20 per cent of the area around each hole

B.Nicks, dents, scratches
0.0020 in. (0.05 mm) in depth

C.Elongated the fastening inner diameter holes
Longest dimension: 0.528 in. (13.41 mm) (nominal diameter: 0.441 in. (11.20 mm))

D.Elongated the locating inner diameter holes
NOTE: The two locating holes on the inner diameter are located at the same position as the ones on forward face of A1 flange.
Longest dimension: 0.528 in. (13.41 mm) (nominal diameter: 0.441 in. (11.20 mm))

E.Elongated the support gear outer diameter holes
Longest dimension: 0.51 in. (12.95 mm) (nominal diameter: 0.2760 in. (7.01 mm))

8.Visual inspection of the other areas of the aft face of A1 flange (6):


A.Nicks, dents, scratches
  • 0.012 in. (0.30 mm) in depth
  • 3.94 in. (100.08 mm) in length
  • 11.81 in. (299.97 mm) in cumulative length per stiffener plate

B.Stiffener plate rivet missing
Any amount

9.Visual inspection of the inner radius of A1 and B2 flanges (7):
F Inner Radius of A1 Flange and B2 Flange


A.Nicks, dents, scratches
A1 flanges:
  • 0.012 in. (0.30 mm) in depth
  • 3.94 in. (100.08 mm) in length
  • 11.81 in. (299.97 mm) in length per stiffener plate
B2 flange:
  • Not serviceable

10.Visual inspection of the outer skin (8) of the fan case (1):
F Inner Skin and Outer Skin of Fan Case


A.Loose, missing fixed insert
Not serviceable

B.Twisted, torn, missing the captive nut
Not serviceable

C.Nicks, dents, scratches on the glass fiber plies
  • 0.012 in. (0.30 mm) in depth
  • 3.94 in. (100.08 mm) in length
  • No carbon visible
  • 39.37 in. (1.00 m) in cumulative length

D.Nicks, dents, scratches on PS12 sensor plate (16)
F Fan Case
0.04 in. (1.02 mm) in depth

E.Twisted, torn PS12 sensor plate (16)
Not serviceable

F.Loose or missing PS12 sensor plate (16)
Not serviceable

G.Missing the bolt on PS12 sensor plate (16)
One missing bolt

11.Visual inspection of the flow path (9):
F Inner Skin and Outer Skin of Fan Case
F Flow Path and Edges of Trench Filler


A.Missing RTV at the panel junction
Any amount

B.Impact marks, craters on the abradable (length less than 5 times width)
  • Depth: Carbon does not show through.
  • Single impacted surface: 3.87 in.2 (2496.77 mm2)
  • Cumulative impacted surface: 155 in.2 (1000.00 cm2)
  • Maximum axial length: 1.97 in. (50.04 mm)
  • The minimum distance between the damaged areas is equal to the maximum width of the nearest single damaged area.
If the carbon plies show through a Continue-In-Service limit of 50 cycles or 125 hours is permitted. Carbon plies must remain within the carbon plies criteria under visual inspection. A daily inspection of the crater must be performed. See repair (Ref. AMM TASK 72-23-01-300-802).
C.Groove (length more than 5 times width and oriented 0 to 80 degrees from engine axis)
  • Four grooves
  • Depth: Carbon does not show through.
  • 1.10 in. (27.94 mm) in width
See repair (Ref. AMM TASK 72-23-01-300-802).
D.Rub
F Flow Path and Edges of Trench Filler
F Flow Path and Edges of Trench Filler
  • Average depth over full circumference (depth X): 0.043 in. (1.09 mm)
  • Average depth over full circumference (depth Y): 0.08 in. (2.03 mm)
  • Maximum local penetration depth in area X: 0.08 in. (2.03 mm)
See repair (Ref. AMM TASK 72-23-01-300-802).
E.Cracks on the abradable
  • Up to 25 cracks, if width less than or equal to 0.02 in. (0.51 mm)
  • Depth: any amount
NOTE: Cracks linked to a serviceable crater are not to be considered.
If more than 25 cracks, width less than or equal to 0.02 in. (0.51 mm), depth any amount the continue-in-service limit of 100 cycles is permitted before tap test inspection at cracks location.
If a hollow sound is detected, do an abradable strip local repair of the affected area:
If no hollow sound detected, more than 25 cracks are acceptable.
NOTE: Cracks linked to a serviceable crater are not to be considered.
F.Circumferential groove (360 degrees or oriented within 80 and 90 degrees from the engine axis)
F Flow Path and Edges of Trench Filler
  • Any number of the grooves in the first 1.97 in. (50.04 mm) from the leading edge less than 0.38 in. (9.65 mm) in cumulative widths
  • Any number of the grooves less than 1.18 in. (29.97 mm) in cumulative width for the total strip width (with respect of the grooves criteria in the first 1.97 in. (50.04 mm) from leading edge)
  • Carbon layer doesn't show through inside the circumferential groove.
See repair (Ref. AMM TASK 72-23-01-300-802).
G.Nicks, dents, scratches, impact marks on the carbon plies
  • 0.012 in. (0.30 mm) in depth
  • 0.79 in. (20.07 mm) in length
  • 0.12 in. (3.05 mm) in width
  • 7.87 in. (199.90 mm) in minimum proximity

H.Fretting on the carbon piles
0.008 in. (0.20 mm) in depth

J.Tears, cracks, scratches on the carbon plies
Not serviceable

K.Local collapse of the inner surface on the carbon plies
Not serviceable

L.Rear Side Erosion
  • Average depth over full circumference (depth X): 0.043 in. (1.09 mm)
  • Average depth over full circumference (depth Y): 0.08 in. (2.03 mm)
NOTE: Calculate the average penetration with eight equally spaced locations.
M.Porosities in adhesive flash
Any amount

12.Visual inspection of the inner skin of the fan case (13):
F Inner Skin and Outer Skin of Fan Case


A.Nicks, dents, scratches
  • 0.012 in. (0.30 mm) in depth
  • 3.94 in. (100.08 mm) in length
  • 14.17 in. (0.36 m) minimum distance between indications
  • 39.37 in. (1.00 m) in cumulative length

B.Elongated PS12 holes
Dimension: 0.272 in. (6.91 mm) (nominal diameter: 0.228 in. (5.79 mm))

13.Visual inspection of the edges of the trench filler (14):
F Flow Path and Edges of Trench Filler


A.Missing RTV at the panel junction or between the panel and the fan case
Any amount except on 19.69 in. (0.50 m) circumferential length, area centered at 6 o'clock position on the forward edge

B.Fretting
0.004 in. (0.10 mm) in depth
See repair (Ref. AMM TASK 72-23-01-300-803).
C.Nicks, dents, scratches
  • 0.012 in. (0.30 mm) in depth
  • 0.79 in. (20.07 mm) in length
  • 0.12 in. (3.05 mm) in width
  • 7.87 in. (199.90 mm) in minimum proximity
See repair (Ref. AMM TASK 72-23-01-300-803).
D.Tears, cracks, punctures on the carbon plies
Not serviceable
See repair (Ref. AMM TASK 72-23-01-300-803).
E.Local collapse of the inner surface on the carbon plies
Not serviceable
See repair (Ref. AMM TASK 72-23-01-300-803).
14.Visual inspection of the radius of the acoustic shroud brackets (15):
F Brackets


A.Nicks, dents, scratches, cracks
Not serviceable
See repair (Ref. AMM TASK 72-23-01-300-801).
15.Visual inspection of the acoustic shroud brackets (15) around the holes:


A.Nicks, dents, scratches, cracks
0.002 in. (0.05 mm) in depth
See repair (Ref. AMM TASK 72-23-01-300-801).
16.Visual inspection of the other surfaces of the acoustic shroud brackets (15):


A.Missing the captive nut on the bracket
Not serviceable
See repair (Ref. AMM TASK 72-23-01-300-801).
B.Twisted, deformed bracket
Not serviceable
See repair (Ref. AMM TASK 72-23-01-300-801).
C.Torn, broken, unbonded bracket
Not serviceable
See repair (Ref. AMM TASK 72-23-01-300-801).
D.Nicks, dents, scratches, cracks
  • 0.004 in. (0.10 mm) in depth
  • 0.59 in. (14.99 mm) in length
  • 0.008 in. (0.20 mm) in width
See repair (Ref. AMM TASK 72-23-01-300-801).
E.Fretting
Minimum thickness: 0.071 in. (1.80 mm)
See repair (Ref. AMM TASK 72-23-01-300-801).
17.Visual inspection of the acoustic shroud bracket attaching parts on the fan case:


A.Missing bolt
Not serviceable
See repair (Ref. AMM TASK 72-23-01-300-801).
B.Missing Hi-Lite nut
Not serviceable
See repair (Ref. AMM TASK 72-23-01-300-801).
C.Cracks
Not serviceable
See repair (Ref. AMM TASK 72-23-01-300-801).
Subtask 72-23-01-420-050-A
C. Install the fan blades (Ref. AMM TASK 72-21-20-400-801).
5. Close-up
Subtask 72-23-01-410-050-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
   (3) Remove the access platform(s).
   (4) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.04.01 02:52:16 UTC
"Aviabrain" 2025