DOC AIRBUS | AMM A320FRepair of the Abradable (Material) Shroud with Circular Patches [CFMI]
TASK 72-23-00-300-025-A
Repair of the Abradable (Material) Shroud with Circular Patches
General
Defect more than 0.12 in. deep and 0.50 in.2 (3.2 cm2) and with fan case base metal exposed.
This task refers to a procedure for the in-place repair of the abradable shroud by installation of circular patches of 1.968 in. (50 mm) maximum diameter.
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Expendable Parts
D. Referenced Information
3. Job Set-up
Subtask 72-23-00-941-087-A ** ON A/C NOT FOR ALL
Subtask 72-23-00-320-056-A ** ON A/C NOT FOR ALL
Subtask 72-23-00-410-099-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:38:55 UTC
Repair of the Abradable (Material) Shroud with Circular Patches
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
CAUTION:
THIS REPAIR MUST NOT BE DONE IN A HUMID ATMOSPHERE. THIS COULD AFFECT THE QUALITY OF THE BONDING COMPOUND. THE MINIMUM AMBIENT TEMPERATURE MUST BE 60 DEG.F (15 DEG.C).
1. Reason for the JobGeneral
Defect more than 0.12 in. deep and 0.50 in.2 (3.2 cm2) and with fan case base metal exposed.
This task refers to a procedure for the in-place repair of the abradable shroud by installation of circular patches of 1.968 in. (50 mm) maximum diameter.
NOTE: The following patch repair is estimated to take less than 3 hours in the hangar when done by skilled mechanics familiarized with the procedure.
2. Job Set-up InformationA. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE |
| No specific | 1 | HEAT SOURCE - RADIANT |
| No specific | AR | MAT - PROTECTIVE |
| No specific | AR | PAINTBRUSH |
| No specific | AR | SCALPEL |
| No specific | AR | VACUUM CLEANER |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP1039) | acetone |
| (Material No.CP1041) | isopropyl alcohol |
| (Material No.CP2011) | stoddard solvent |
| (Material No.CP2239) | 3M 301D |
| (Material No.CP2244) | primer 1200 |
| (Material No.CP2297) | RTV 147 A |
| (Material No.CP2298) | Catalyst 147 B |
| (Material No.CP2306) | 3M 5490 tape |
| (Material No.CP2339) | RTV 630 |
| (Material No.CP2559) | ardrox 552 |
| (Material No.CP2560) | turco ind 79 |
| (Material No.CP2566) | mag-chem teksol |
| (Material No.CP2584) | degreasol 99 R |
| (Material No.CP2656) | mag-chem skysol |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 00 | FAN INLET CASE ABRADABLE CARTRIDGE | AIPC 72-23-00-55-531 |
| 00 | FAN INLET CASE ABRADABLE CARTRIDGE | AIPC 72-23-00-55-532 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 72-21-00-000-001-A | Removal of the Spinner Front Cone |
| TASK 72-21-00-000-002-A | Removal of the Spinner Rear Cone |
| TASK 72-21-00-000-003-A | Removal of the Fan Rotor Blades |
| TASK 72-21-00-400-001-A | Installation of the Spinner Front Cone |
| TASK 72-21-00-400-002-A | Installation of the Spinner Rear Cone |
| TASK 72-21-00-400-003-A | Installation of the Fan Rotor Blades |
Repair of the Abradable Shroud with Circular PatchesSubtask 72-23-00-941-087-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).
Subtask 72-23-00-010-109-A ** ON A/C NOT FOR ALL (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).
B. Get Access
(1) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
(2) Install MAT - PROTECTIVE in the lower half of the inlet cowl.
(3) Remove the spinner front cone (Ref. AMM TASK 72-21-00-000-001).
(4) Remove the spinner rear cone (Ref. AMM TASK 72-21-00-000-002).
(5) Remove a sufficient number of fan blades to get access to the repair area (Ref. AMM TASK 72-21-00-000-003).
4. Procedure(1) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
(2) Install MAT - PROTECTIVE in the lower half of the inlet cowl.
(3) Remove the spinner front cone (Ref. AMM TASK 72-21-00-000-001).
(4) Remove the spinner rear cone (Ref. AMM TASK 72-21-00-000-002).
(5) Remove a sufficient number of fan blades to get access to the repair area (Ref. AMM TASK 72-21-00-000-003).
Subtask 72-23-00-320-056-A ** ON A/C NOT FOR ALL
A. Repair of the Abradable Shroud with Circular Patches
(1) Remove the unwanted pieces of abradable liner.
(a) Punch out the abradable material to the base metal, at the location of the defect, maximum diameter 1.968 in. (50 mm).
(b) Use a SCALPEL and 3M 301D (Material No.CP2239) to remove all pieces of the abradable material.
(c) Blow the part clean with shop air.
Subtask 72-23-00-110-053-A ** ON A/C NOT FOR ALL (1) Remove the unwanted pieces of abradable liner.
(a) Punch out the abradable material to the base metal, at the location of the defect, maximum diameter 1.968 in. (50 mm).
(b) Use a SCALPEL and 3M 301D (Material No.CP2239) to remove all pieces of the abradable material.
(c) Blow the part clean with shop air.
B. Degrease Area
(1) Use acetone (Material No.CP1039) or stoddard solvent (Material No.CP2011) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or isopropyl alcohol (Material No.CP1041) to remove the grease from the area to be repaired.
Subtask 72-23-00-340-052-A ** ON A/C NOT FOR ALL (1) Use acetone (Material No.CP1039) or stoddard solvent (Material No.CP2011) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or isopropyl alcohol (Material No.CP1041) to remove the grease from the area to be repaired.
C. Apply the Abradable Liner Patch
(1) Remove grease from the part with a Textile-Lint free Cotton - (Material No.14SBA1) soaked in acetone (Material No.CP1039) or stoddard solvent (Material No.CP2011) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or isopropyl alcohol (Material No.CP1041) .
(b) Stir the mixture manually or mechanically until it is fully mixed.
(3) Apply the primer as follows:
(a) Remove grease from the area to be repaired.
(b) Apply primer 1200 (Material No.CP2244) on the degreased area of fan case with a Textile-Lint free Cotton - (Material No.14SBA1) or a PAINTBRUSH.
(c) Allow to dry at ambient temperature for 45 minutes.
(a) From a (spare) new AIPC 72-23-00-55-531 FAN INLET CASE ABRADABLE CARTRIDGE (00) or AIPC 72-23-00-55-532 FAN INLET CASE ABRADABLE CARTRIDGE (00) , punch out a circular patch at the equivalent size of the defect.
(c) Punch one hole with a diameter 0.118 inch (3 mm) at the center of the patch. Keep the 0.118 in. (3 mm) diameter piece of abradable. It will be used as a cap after the final application of the repair patch.
1 Remove the grease with acetone (Material No.CP1039) or stoddard solvent (Material No.CP2011) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or isopropyl alcohol (Material No.CP1041) .
(e) Apply bonding compound on the case, on the underside and edges of the patch.
(5) Bond the patch
(a) Press strongly all around the little hole to remove unwanted compound and any air below the patch.
(b) After the final application, plug the central hole with the cap.
(c) Remove the mixture from the part surface with a white cloth before polymerization.
(d) Hold the patch in place with 3M 5490 tape (Material No.CP2306) .
Subtask 72-23-00-350-054-A ** ON A/C NOT FOR ALL (1) Remove grease from the part with a Textile-Lint free Cotton - (Material No.14SBA1) soaked in acetone (Material No.CP1039) or stoddard solvent (Material No.CP2011) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or isopropyl alcohol (Material No.CP1041) .
WARNING:
PUT ON PROTECTIVE GLOVES WHEN YOU USE THE BASE AND HARDENER. IF YOU DO NOT OBEY THIS PRECAUTION, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(2) Prepare the bonding compound as follows: NOTE: You must use the compound within 2 hours after it is mixed.
(a) Mix 100 parts of RTV 147 A (Material No.CP2297) with 10 parts of Catalyst 147 B (Material No.CP2298) or use RTV 630 (Material No.CP2339) , at ambient temperature. (b) Stir the mixture manually or mechanically until it is fully mixed.
(3) Apply the primer as follows:
(a) Remove grease from the area to be repaired.
(b) Apply primer 1200 (Material No.CP2244) on the degreased area of fan case with a Textile-Lint free Cotton - (Material No.14SBA1) or a PAINTBRUSH.
(c) Allow to dry at ambient temperature for 45 minutes.
NOTE: Too much primer will reduce adherence. Also do not touch the primer after it is applied.
(4) Prepare the abradable liner patch as follows: (a) From a (spare) new AIPC 72-23-00-55-531 FAN INLET CASE ABRADABLE CARTRIDGE (00) or AIPC 72-23-00-55-532 FAN INLET CASE ABRADABLE CARTRIDGE (00) , punch out a circular patch at the equivalent size of the defect.
NOTE: In this repair, the maximum diameter dimension of the patch is set at 1.968 inch (50 mm).
(b) Lightly sand the underside and the edges of the patch with 3M 301D (Material No.CP2239) . (c) Punch one hole with a diameter 0.118 inch (3 mm) at the center of the patch. Keep the 0.118 in. (3 mm) diameter piece of abradable. It will be used as a cap after the final application of the repair patch.
NOTE: The hole of the center of the patch will do as a vent hole during the application of the patch on the fan inlet case.
(d) Degrease. 1 Remove the grease with acetone (Material No.CP1039) or stoddard solvent (Material No.CP2011) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or isopropyl alcohol (Material No.CP1041) .
(e) Apply bonding compound on the case, on the underside and edges of the patch.
(5) Bond the patch
(a) Press strongly all around the little hole to remove unwanted compound and any air below the patch.
(b) After the final application, plug the central hole with the cap.
(c) Remove the mixture from the part surface with a white cloth before polymerization.
(d) Hold the patch in place with 3M 5490 tape (Material No.CP2306) .
D. Cure the Compound with a HEAT SOURCE - RADIANT and obey the curing cycle which follows:
(1) 1 hour at 212 deg.F (100.00 deg.C).
(2) 1 hour at 302 deg.F (150.00 deg.C).
Subtask 72-23-00-210-064-A ** ON A/C NOT FOR ALL (1) 1 hour at 212 deg.F (100.00 deg.C).
(2) 1 hour at 302 deg.F (150.00 deg.C).
E. Do a Last Check of the Abradable Liner
(1) When you do the visual check, examine all joints and patch areas to make sure there are no defects as porosity or trapped air bubbles.
(2) If you see defects, you must do the repair again.
Subtask 72-23-00-320-058-A ** ON A/C NOT FOR ALL (1) When you do the visual check, examine all joints and patch areas to make sure there are no defects as porosity or trapped air bubbles.
(2) If you see defects, you must do the repair again.
F. Complete the Repair as follows
(1) Hand finish the abradable liner.
(a) Hand finish the reconditioned area to put it back to the contour and dimensions of the adjacent areas.
(b) Sand lightly with 3M 301D (Material No.CP2239) .
(2) Remove the abradable material dust and hand sanding residues from the repair area with a VACUUM CLEANER.
5. Close-up(1) Hand finish the abradable liner.
(a) Hand finish the reconditioned area to put it back to the contour and dimensions of the adjacent areas.
(b) Sand lightly with 3M 301D (Material No.CP2239) .
(2) Remove the abradable material dust and hand sanding residues from the repair area with a VACUUM CLEANER.
Subtask 72-23-00-410-099-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) Install the fan blades (Ref. AMM TASK 72-21-00-400-003).
(3) Install the spinner rear cone (Ref. AMM TASK 72-21-00-400-002).
(4) Install the spinner front cone (Ref. AMM TASK 72-21-00-400-001).
(5) Remove the MAT - PROTECTIVE from the lower half of the inlet cowl.
(6) Remove the access platform(s).
(7) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the fan blades (Ref. AMM TASK 72-21-00-400-003).
(3) Install the spinner rear cone (Ref. AMM TASK 72-21-00-400-002).
(4) Install the spinner front cone (Ref. AMM TASK 72-21-00-400-001).
(5) Remove the MAT - PROTECTIVE from the lower half of the inlet cowl.
(6) Remove the access platform(s).
(7) Remove the WARNING NOTICE(S).