DOC AIRBUS | AMM A320FLocal Repair of the Fan Case Abradable Liner [CFML]
TASK 72-23-01-300-802-A
Local Repair of the Fan Case Abradable Liner
This procedure gives instructions to locally repair the abradable liner of the fan case.
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 72-23-01-941-052-A
Subtask 72-23-01-942-051-A
[Rev.10 from 2021]
2026.04.01 02:52:18 UTC
Local Repair of the Fan Case Abradable Liner
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.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 400
1. Reason for the JobThis procedure gives instructions to locally repair the abradable liner of the fan case.
NOTE: You can use equivalent alternatives for standard tools, equipment and consumable materials.
2. Job Set-up InformationA. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | AIR SOURCE FILTERED, DRY |
| No specific | 1 | CUTTER - THIN BLADE |
| No specific | 1 | MALLET - WOODEN |
| No specific | 1 | MAT - PROTECTIVE |
| No specific | 1 | SPATULA - PLASTIC |
| No specific | 1 | TESTER - HARDNESS (MICRODUR TYPE OR EQUIVALENT) |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP1041) | isopropyl alcohol |
| (Material No.CP2364) | S W-3524 B-A (BLUE) - EC 3524 B-A (BLUE) |
| (Material No.CP2772) | abrasive cloth |
| (Material No.CP2923) | S W-3524 B-A (BLACK) - EC 3524 B-A (BLACK) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| REFERENCE | DESIGNATION |
|---|---|
Fan Case - Abradable Material RepairSubtask 72-23-01-941-052-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:
(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).
(3) Install a MAT - PROTECTIVE in the lower half of the inlet cowl.
4. Procedure(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.
(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).
(3) Install a MAT - PROTECTIVE in the lower half of the inlet cowl.
WARNING:
WHEN YOU DO WORK WITH COMPOSITE MATERIALS, USE PERSONAL PROTECTION EQUIPMENT AND A LOCAL MECHANICAL EXHAUST VENTILATION OR AN APPROVED RESPIRATOR. YOU MUST NOT BREATHE THE PARTICLES FROM THE REPAIR OF COMPOSITE MATERIALS OR LET THE PARTICLES TOUCH YOU. THE PARTICLES CAN CAUSE INJURY OR IRRITATION TO YOU, AND DAMAGE TO EQUIPMENT.
CAUTION:
MAKE SURE THAT THE AREAS ADJACENT TO THE REPAIR AREA ARE IN GOOD CONDITION TO GET A SERVICEABLE PROFILE FLOWPATH. IF THE ADJACENT AREAS ARE NOT IN GOOD CONDITION, IT WILL NOT BE POSSIBLE TO CORRECTLY USE THE TOOLS USED IN THE PROCEDURE.
Subtask 72-23-01-350-051-A A. Prepare the area to repair
(3) Blow with the AIR SOURCE FILTERED, DRY and de-oiled.
Subtask 72-23-01-110-051-A Subtask 72-23-01-360-050-A CAUTION:
BE CAREFUL NOT TO CAUSE DAMAGE TO THE CARBON SKIN BELOW THE ABRADABLE MATERIAL. AN UNSERVICEABLE CONDITION CAN OCCUR.
(1) Remove all deviations and/or unbonded abradable material from the liner. If necessary, use the SPATULA - PLASTIC or the CUTTER - THIN BLADE to get a clean surface. If necessary, remove the abradable material from the area to repair until you see the carbon skin. Do not damage the carbon skin. NOTE: The remaining abradable must be clean and not disbonded.
(2) Make the area to repair smooth with an alumina abrasive cloth (Material No.CP2772) . (3) Blow with the AIR SOURCE FILTERED, DRY and de-oiled.
C. Apply the abradable material as follows:
(a) Prepare theCP2923 S W-3524 B-A (BLACK) - EC 3524 B-A (BLACK)
(c) If necessary, heat the above mixture to 77 deg.F (25.00 deg.C) to make the application of product to the part easier. The most appropriate work temperature is between 68 deg.F (20.00 deg.C) and 77 deg.F (25.00 deg.C).
(2) Apply the abradable material:
(b) Make sure that the application surface is clean and not disbonded.
(c) Apply a very thin layer of abradable material on the area to repair and apply sufficient pressure with your thumb to obtain better results.
(d) Fill the remaining thickness with abradable material.
(e) Adjust the abradable liner with the SPATULA - PLASTIC or a locally manufactured tool. Flush to the adjacent flow path area that is in good condition.
Subtask 72-23-01-310-050-A CAUTION:
WEAR GLOVES THAT HAVE NO TALC OR SILICONE TO PREVENT CONTAMINATION OF ABRADABLE COMPOUND.
(1) Prepare the abradable material: (a) Prepare the
- Base Scotch-WeldTM EC-3524 part B black: 100 parts by weight
- Accelerator Scotch-WeldTM EC-3524 part A black: 94 parts by weight.
NOTE: If necessary, you can use CP2364 S W-3524 B-A (BLUE) - EC 3524 B-A (BLUE)
(b) Stir the above mixture manually until you get a homogeneous material with a dark gray color. Mix both parts slowly to prevent air bubbles in the mixture. (c) If necessary, heat the above mixture to 77 deg.F (25.00 deg.C) to make the application of product to the part easier. The most appropriate work temperature is between 68 deg.F (20.00 deg.C) and 77 deg.F (25.00 deg.C).
(2) Apply the abradable material:
NOTE: If the blue product is used, the final cosmetic result of the repaired area will be different from the original.
(a) If necessary, heat the area that you will repair or the working environment between 68 deg.F (20.00 deg.C) and 77 deg.F (25.00 deg.C) to make the application of product to the part easier. (b) Make sure that the application surface is clean and not disbonded.
(c) Apply a very thin layer of abradable material on the area to repair and apply sufficient pressure with your thumb to obtain better results.
(d) Fill the remaining thickness with abradable material.
(e) Adjust the abradable liner with the SPATULA - PLASTIC or a locally manufactured tool. Flush to the adjacent flow path area that is in good condition.
D. Do the polymerization of the abradable material as follows:
(2) Alternative proceudre. Polymerize at between 122 deg.F (50.00 deg.C) and 140 deg.F (60.00 deg.C) during five hours.
(3) Alternative procedure. Polymerize at between 158 deg.F (70.00 deg.C) and 194 deg.F (90.00 deg.C) during two hours.
Subtask 72-23-01-280-050-A CAUTION:
DO NOT APPLY A TEMPERATURE HIGHER THAN THE POLYMERIZATION TEMPERATURE TO:
(1) Alternative procedure available. Polymerize at room temperature during 24 hours. Room temperature must be between 59 deg.F (15.00 deg.C) and 77 deg.F (25.00 deg.C). Use 77 deg.F (25.00 deg.C) to obtain better results. - THE AREAS ADJACENT TO THE FAN CASE AND
- THE FAN BLADES ADJACENT TO THE REPAIR AREAS.
(2) Alternative proceudre. Polymerize at between 122 deg.F (50.00 deg.C) and 140 deg.F (60.00 deg.C) during five hours.
(3) Alternative procedure. Polymerize at between 158 deg.F (70.00 deg.C) and 194 deg.F (90.00 deg.C) during two hours.
E. Hardness Check
(1) Use the TESTER - HARDNESS (MICRODUR TYPE OR EQUIVALENT) to check the hardness:
(a) The hardness must be between 40 and 60 Shore D.
Subtask 72-23-01-220-052-A (1) Use the TESTER - HARDNESS (MICRODUR TYPE OR EQUIVALENT) to check the hardness:
(a) The hardness must be between 40 and 60 Shore D.
F. Inspection of the Repaired Area
(1) Do a visual inspection of the liner for bubbles or missing abradable material:
(a) Air bubbles are not permitted.
(b) Lack of abradable is not permitted.
(2) Do a dimension check of the repaired area with the SPATULA - PLASTIC or a locally manufactured tool. The tool must be in contact with the adjacent unrepaired areas that are in good condition:
(a) Bumped areas must not be more than 0.01 in. (0.25 mm) thick.
(b) Depressed areas must not be more than 0.01 in. (0.25 mm) deep.
(c) If necessary, blend the abradable to the final dimensionsSPM 704111 .
(d) The forward radius must be between 0.119 in. (3.0 mm) and 0.196 in. (5.0 mm).
(3) Do a check of the abradable material bonding with the MALLET - WOODEN. A dull sound tells that the abradable material is not correctly bonded.
(4) If the inspection shows an unserviceable condition, do the repair again.
5. Close-up(1) Do a visual inspection of the liner for bubbles or missing abradable material:
(a) Air bubbles are not permitted.
(b) Lack of abradable is not permitted.
(2) Do a dimension check of the repaired area with the SPATULA - PLASTIC or a locally manufactured tool. The tool must be in contact with the adjacent unrepaired areas that are in good condition:
(a) Bumped areas must not be more than 0.01 in. (0.25 mm) thick.
(b) Depressed areas must not be more than 0.01 in. (0.25 mm) deep.
(c) If necessary, blend the abradable to the final dimensions
(d) The forward radius must be between 0.119 in. (3.0 mm) and 0.196 in. (5.0 mm).
(3) Do a check of the abradable material bonding with the MALLET - WOODEN. A dull sound tells that the abradable material is not correctly bonded.
(4) If the inspection shows an unserviceable condition, do the repair again.
Subtask 72-23-01-942-051-A
A. 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 MAT - PROTECTIVE.
(3) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the MAT - PROTECTIVE.
(3) Remove the WARNING NOTICE(S).