W DOC AIRBUS | AMM A320F

Visual Inspection of the Acoustic Shroud [CFML]

TASK 72-23-03-210-801-A
Visual Inspection of the Acoustic Shroud

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 visual inspection criteria for the acoustic shroud.
NOTE: The inspection criteria below are applicable after removal of high composite.
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
1
MAT - PROTECTIVE FOAM
No specific
AR
WARNING NOTICE(S)
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
400
POWER PLANT, NACELLES AND PYLONS
447AL, 448AR
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 72-23-03-300-801-A
Acoustic Shroud - Local or Full Rebond of the Elastomer Acoustic Shroud Rear Seal
F Acoustic Shroud Inner Surface
3. Job Set-up
Subtask 72-23-03-941-052-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 72-23-03-010-052-A
B. Get Access
447AL 448AR
   (1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
   (2) Put a MAT - PROTECTIVE FOAM in the air intake.
4. Procedure
Subtask 72-23-03-210-050-A
A. Visual Inspection of the Inner Face of the Acoustic Shroud (1)
See the figure:
F Acoustic Shroud Inner Surface
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Local blind multi-perforations
Any amount.

2.Nicks, dents, scratches, cracks, flaking on protective coating
Any amount.

3.Tears, punctures, cracks through the skin of protective coating
Any amount.
4.Missing of protection coating
Any amount.
5.Nicks, dents, scratches, impact marks on the carbon plies
  • Depth: 0.012 in. (0.30 mm)
  • Length: 0.79 in. (20.07 mm)
  • Width: 0.12 in. (3.05 mm)
  • Proximity: 7.87 in. (199.90 mm)
See repair (Ref. AMM D/O 72-23-03-30).
6.Tears, cracks, punctures on the carbon plies
Not serviceable
See repair (Ref. AMM D/O 72-23-03-30).
7.Micro-shrinkage on inner face around the acoustic hole
Any amount.
Subtask 72-23-03-210-051-A
B. Visual Inspection of the Outer Surfaces of the Acoustic Shroud (1)
F Acoustic Shroud Inner Surface
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Nicks, dents, scratches, impact marks on the carbon plies
  • Depth: 0.011 in. (0.3 mm)
  • Length: 0.78 in. (20 mm)
  • Width: 0.11 in. (3 mm)
  • Proximity: 7.88 in. (200 mm).
2.Tears, cracks, punctures on the carbon plies
Not serviceable.
3.Local collapse of the surface
Any amount.
Subtask 72-23-03-210-052-A
C. Visual Inspection of the Edges and Radius of the Acoustic Shroud (1)
F Acoustic Shroud Inner Surface
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Nicks, dents, scratches, impact marks on the carbon plies
  • Cumulated length: 4 in. (101.6 mm)
  • Width: 0.20 in. (5 mm)
  • Depth: 0.040 in. (1 mm).
2.Tears, cracks, punctures on the carbon plies
Not serviceable.
3.Fretting on the forward edge (contact with the inlet)
  • Depth: 0.004 in. (0.1 mm).
4.Porosities
Any amount
Porosities are due to manufacturing process.
5.Dry area
Any amount
Dry areas are due to manufacturing process.
6.Void
Any amount
Void are due to manufacturing process.
7.Coloration aspect (grey-blue-white) due to resin deposit on forward edge
Any amount
Colorations are due to manufacturing process.
Subtask 72-23-03-210-053-A
D. Visual Inspection of the Rear Seal
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Missing bonded seal
  • Cumulated length: 39.37 in. (1 m)
See repair (Ref. AMM TASK 72-23-03-300-801).
2.Cut, worn through, torn seal
  • Cumulated length: 39.37 in. (1 m)
See repair (Ref. AMM TASK 72-23-03-300-801).
3.Crazing in the seal
Any amount.
Subtask 72-23-03-210-054-A
E. Visual Inspection of the Radius of Brackets
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Nicks, dents, scratches, cracks
Not Serviceable.
Subtask 72-23-03-210-055-A
F. Visual Inspection of Area J around bolt holes edges of Brackets
F Acoustic Shroud Inner Surface
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Fretting
0.01 in. (0.25 mm) in depth over 20 percent of area around each hole.
2.Elongated screw holes
  • Diameter: Up to 0.28 in. (7.11 mm).
3.Elongated pin holes
  • Diameter: Up to 0.32 in. (8.13 mm).
Subtask 72-23-03-210-056-A
G. Visual Inspection of Other Surfaces of Brackets
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Fretting
Minimum thickness: 0.070 in. (1.8 mm).
2.Nicks, dents, scratches
  • Depth: 0.003 in. (0.1 mm)
  • Length: 0.007 in. (0.2 mm)
  • Width: 0.59 in. (15 mm).
3.Cracks
Not serviceable.
4.Torn, broken, unbounded bracket
Not serviceable.
5.Twisted, deformed bracket
Not serviceable.
6.Missing rivets on the bracket
Not serviceable.
5. Close-up
Subtask 72-23-03-410-051-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
447AL 448AR
   (2) Remove the MAT - PROTECTIVE FOAM from the air intake.
   (3) Remove the access platform(s).
   (4) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.04.01 13:03:35 UTC
"Aviabrain" 2025