W DOC AIRBUS | AMM A320F

Repair the Fan Case Front Acoustic Liner [PW11]

TASK 72-21-01-320-801-A
Repair the Fan Case Front Acoustic Liner

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
WARNING: YOU MUST USE A CORRECT EYE PROTECTION WHEN YOU PERFORM THIS PROCEDURE. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.
ZONE: 400
1. Reason for the Job
Use this procedure to repair the damage on the front acoustic liner.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
GUN - SEALANT
No specific
1
KNIFE - PUTTY
No specific
1
MACHINE - DRILLING, PORTABLE
No specific
1
VACUUM CLEANER
636-1100-3GSE
1
INLET COWL PROTECT COVER
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.P05-146)
abrasive paper, silicon carbide
(Material No.P05-253)
paper, abrasive
(Material No.P05-260)
spatula, acrylic or fiber
(Material No.P05-274)
paper, abrasive
(Material No.P05-437)
tape, pressure sensitive polyester
(Material No.P05-493)
tape, non-silicone adhesive, polyester
(Material No.P08-016)
adhesive paste, epoxy, non-thixotropic
(Material No.P08-025)
adhesive paste, epoxy, thixotropic
(Material No.P11-065)
acetone
(Material No.P11-078)
alcohol, isopropyl
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
400
POWER PLANT, NACELLES AND PYLONS
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 70-27-00-910-804-A
SPOP 208 - Degreasing of Parts by Solvent Wiping
TASK 70-28-00-910-803-A
SPOP 42 - Chromate Conversion Coating of Aluminum
TASK 70-28-00-910-805-A
SPOP 167 - Application of PWA 36515 Primer
TASK 71-00-00-860-833-A
Procedure to Prevent Engine Motoring
F Fan Case Assembly Front Acoustic Liner Repair
3. Job Set-up
Subtask 72-21-01-941-065-A ** ON A/C NOT FOR ALL
A. Safety Precautions
   (1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
   (2) Put an 636-1100-3GSE INLET COWL PROTECT COVER inside the engine intake cowl and fan case inside surfaces.
4. Procedure
CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
Subtask 72-21-01-350-052-A ** ON A/C NOT FOR ALL
A. Repair of the Fan Case Front Acoustic-Liner
   (1) Use the P05-146abrasive paper, silicon carbide, P05-253paper, abrasive or the P05-274paper, abrasive to abrade the repair area on the front acoustic liner to make the damage smooth and remove any contamination. Ensure that debris does not contaminate the engine. Remove all remaining debris with the VACUUM CLEANER.
   (2) Visually examine the repair area. If the inner surface of the outer ring is damaged, follow the disposition per the visual inspection section. Perform a tap test to verify that the disbond did not extend past the repair area. Reject any disbond.
   (3) Clean the repair area by SPOP 208 with the P11-078alcohol, isopropyl or the acetone (Material No.P11-065) (Ref. AMM TASK 70-27-00-910-804):
     (a) Flush the repair area before wiping. Mask outside the repair area to ensure that the solvent does not contaminate the engine.
     (b) Allow the surface to air-dry at 60 deg.F (15.56 deg.C) to 90 deg.F (32.22 deg.C) for a minimum of 15 minutes.
   (4) Apply anodize touch-up solution to any exposed aluminum surfaces at the repair area by SPOP 42 using AMS 2474 only and allow to air-dry for one hour minimum (Ref. AMM TASK 70-28-00-910-803).
   (5) Clean the repair area by SPOP 208. Use the P11-078alcohol, isopropyl or the acetone (Material No.P11-065) and allow the surface to air-dry at 60 deg.F (15.56 deg.C) to 90 deg.F (32.22 deg.C) for a minimum of 15 minutes (Ref. AMM TASK 70-27-00-910-804).
   (6) Mask the front acoustic liner treatment outside of the repair area to prevent the adhesives and dust from blocking the acoustic treatment. Use the P05-437tape, pressure sensitive polyester or the P05-493tape, non-silicone adhesive, polyester.
   (7) Fill the repair area per PWA 615. Use the P08-016adhesive paste, epoxy, non-thixotropic or the P08-025adhesive paste, epoxy, thixotropic, except the repair may occur in a clean area as follows:
CAUTION: MAKE SURE THAT:
  • THERE ARE NO UNCURED PAINTS, UNCURED EPOXY, OILS, POWDER, FUMES, DUST AND OTHER DEBRIS ON THE REPAIR AREA
  • THERE IS NO CONTAMINATION ON THE MATERIALS, TOOLINGS, FIXTURES AND HANDLING EQUIPMENT USED.
CONTAMINATION OF THE REPAIR AREA, THE MATERIALS AND/OR THE EQUIPMENT WILL HAVE AN UNWANTED EFFECT ON THE BONDING, SEALING AND FILLING QUALITY. IF YOU DO NOT OBEY THIS CAUTION, SEAL SEPARATION AND LOSS OF BOND CAN OCCUR.
     (a) Mix the repair material in the following proportions, step 4.A.(7)(a)1_ or step 4.A.(7)(a)2_:
       1 P08-016adhesive paste, epoxy, non-thixotropic part A 100 parts to part B 33 parts.
       2 P08-025adhesive paste, epoxy, thixotropic part A 100 parts to part B 17 parts.
NOTE: These mixtures have a 60 minutes life after mixing.
     (b) Fill the honeycomb cells in the damaged area and a minimum of one cell full beyond the damaged area by using the GUN - SEALANT. Make smooth the filler surface with a KNIFE - PUTTY or a P05-260spatula, acrylic or fiber:
       1 If necessary, it is permitted to increase the size of the liner perforations in the front acoustic liner by using the MACHINE - DRILLING, PORTABLE.
       2 The compound, when applied, must come out through the liner perforations.
     (c) Ensure that the adhesive filler material is retained in the repair location.
     (d) Cure the adhesive, step 4.A.(7)(d)1_ or step 4.A.(7)(d)2_:
       1 4 hours minimum at 60 deg.F (15.56 deg.C) to 90 deg.F (32.22 deg.C) followed by 1.5 hour at 140 deg.F (60.00 deg.C) to 160 deg.F (71.11 deg.C).
       2 24 hours minimum at 60 deg.F (15.56 deg.C) to 90 deg.F (32.22 deg.C).
     (e) Remove the masking tape after a minimum of 4 hours cure time.
   (8) After the filler material is cured, remove the excess filler materials from the adjacent contour with the P05-146abrasive paper, silicon carbide, P05-253paper, abrasive, P05-274paper, abrasive or equivalent. Ensure that the transition from the repair to the non-repair area is smooth and continuous.
   (9) Clean the repair area by SPOP 208. Use the P11-078alcohol, isopropyl or the acetone (Material No.P11-065) and allow the surface to air-dry at 60 deg.F (15.56 deg.C) to 90 deg.F (32.22 deg.C) for a minimum of 15 minutes (Ref. AMM TASK 70-27-00-910-804).
   (10) Visually examine the repair area to ensure that all damage has been repaired.
   (11) Apply anodize touch-up solution to any exposed aluminum surfaces at the repair area by SPOP 42 using AMS 2474 only and allow to air-dry for 1 hour minimum (Ref. AMM TASK 70-28-00-910-803).
   (12) Touch-up the protective coating on the abraded aluminum-facesheet surface and epoxy repaired area by SPOP 167 using the P08-025adhesive paste, epoxy, thixotropic (Ref. AMM TASK 70-28-00-910-805).
   (13) Use a VACUUM CLEANER to remove chips and debris, paying particular attention to the bottom of the fan case.
   (14) Clean the repair area by SPOP 208. Use the P11-078alcohol, isopropyl or the acetone (Material No.P11-065) (Ref. AMM TASK 70-27-00-910-804).
   (15) Examine the assembly for foreign object damage and correct assembly.
5. Close-up
Subtask 72-21-01-860-057-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
   (1) Remove the 636-1100-3GSE INLET COWL PROTECT COVER from the air intake cowl.
[Rev.10 from 2021] 2026.04.01 13:02:30 UTC
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