DOC AIRBUS | AMM A320FRepair of the Fan Case Acoustic Linings by bonding - VRS1511 [IAE]
TASK 72-32-85-300-047-B
Repair of the Fan Case Acoustic Linings by bonding - VRS1511
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 72-32-85-941-137-A ** ON A/C NOT FOR ALL
Subtask 72-32-85-350-084-A ** ON A/C NOT FOR ALL
Subtask 72-32-85-410-110-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:01:06 UTC
Repair of the Fan Case Acoustic Linings by bonding - VRS1511
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | GUN - SEALANT |
| No specific | AR | MACHINE - DRILLING |
| No specific | AR | MAT - WORK |
| No specific | AR | VACUUM CLEANER |
| No specific | AR | WARNING NOTICE(S) |
| IAE1N20444 | 1 | TOOL-TAPPING |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V01-076) | Methyl Ethyl Ketone, Technical grade |
| (Material No.V01-124) | Isopropyl Alcohol, Technical grade |
| (Material No.V02-005) | adhesive tape |
| (Material No.V02-160) | teflon tape |
| (Material No.V02-162) | syringe |
| (Material No.V02-223) | release film |
| (Material No.V05-020) | waterproof silicon carbide |
| (Material No.V08-024) | sealant |
| (Material No.V08-115) | sealant |
| (Material No.V08-125) | sealant |
| No specific | polyethylene sheet |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 72-31-00-000-010-B | Removal of the LP Compressor (Fan) Module |
| TASK 72-31-00-400-010-B | Installation of the LP Compressor (Fan) Module |
| TASK 72-31-11-000-010-B | Removal of the LP Compressor Fan Blades |
| TASK 72-31-11-400-010-C | Installation of the LP Compressor Fan Blades |
| TASK 72-32-85-300-020-A | Repair by Replacement of the Acoustic Linings - VRS1845 |
Bonding Repair of the Acoustic LiningSubtask 72-32-85-941-137-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 72-32-85-010-112-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. Remove the LP Compressor Blades and Fillers (Ref. AMM TASK 72-31-11-000-010) or remove the LP compressor (Fan) module (Ref. AMM TASK 72-31-00-000-010).
Subtask 72-32-85-941-138-A ** ON A/C NOT FOR ALL C. Put the Ground Support Equipment in to Position
(1) Put the ACCESS PLATFORM 1M(3 FT) into position to give access to the engine.
(2) Put the MAT - WORK into position in the fan case.
4. Procedure(1) Put the ACCESS PLATFORM 1M(3 FT) into position to give access to the engine.
(2) Put the MAT - WORK into position in the fan case.
NOTE: Make sure that the red warning pennants of the workmat can be seen externally.
NOTE: Make sure that the workmat has sufficient dimensions to give full protection to the lower half of the fan case.
Subtask 72-32-85-350-084-A ** ON A/C NOT FOR ALL
A. Prepare areas of unbond.
(1) Use adhesive tape (Material No.V02-005) and polyethylene sheet or equivalent to protect the engine opening.
(b) Drill 0.161 in. (4,09 mm) holes along the repair area 0.90 in. (22,9 mm) intervals in axial direction and at 0.50 in. (12,7 mm) intervals in cross axial direction.
(c) Make sure the holes cover at least 1.00 in. (25,4 mm) more than the unbonded area.
(3) Remove the adhesive material from the unbonded area.
(a) Remove the adhesive material from the unbonded area on the underside of the perforated skin using a locally manufactured tool and
VACUUM CLEANER.
(b) The tool may either be a hand tool or fitted to an angle drill (maximum speed 300 rpm). Be careful not to cause damage to the inner surface of the fan case assembly.
(c) When carrying out this TASK, use a piece of suitable clear plastic with a slot and hole so as to press downwards on the outer side of the skin whilst at the same time pulling upwards onto the underside of the skin with the tool. This will balance the forces on the skin and prevent further accidental skin unbond
(d) Do not carry out this TASK more than is necessary to remove the adhesive or the skin may be totally machined away.
(4) Make sure the remaining skin surface is smooth. All burrs on the edge of holes must be removed with the waterproof silicon carbide (Material No.V05-020) .
(5) Remove the remaining debris.
(6) Mask the repair area with the adhesive tape (Material No.V02-005) . Make sure the adhesive tape covers at least 0.17 in. (4,3 mm) more than hole diameter.
Subtask 72-32-85-110-060-A ** ON A/C NOT FOR ALL (1) Use adhesive tape (Material No.V02-005) and polyethylene sheet or equivalent to protect the engine opening.
NOTE: Make sure that the masking sheet has sufficient dimensions to give full protection to the inlet of the LPC guide vane assembly, outlet of the stage 2.5 bleed duct and inside of the LP stub shaft.
(2) Make the sealant filler holes for the unbonded areas. WARNING:
STOP DRILLING AS SOON AS THE DRILL IS THROUGH THE PERFORATED SKIN. USE A STOP-DRILL OR SLEEVE OR OTHER PENETRATION LIMITING DEVICE TO PREVENT DAMAGE TO THE CASING MATERIAL OF THE FAN CASE.
WARNING:
DO NOT OPERATE WITHOUT SAFETY GOGGLES AND OTHER GUARD EQUIPMENT. FLYING PARTICLES CAN CAUSE INJURY.
CAUTION:
THE FAN CASE IS MADE FROM TITANIUM ALLOY AND IS THIN IN SOME AREAS. IF YOU HIT THE FAN CASE WITH A CHISEL OR SCRAPER YOU CAN MAKE IT UNSERVICEABLE.
(a) Use the drill and MACHINE - DRILLING. Be careful not to cause damage to the inner surface of the fan case assembly. (b) Drill 0.161 in. (4,09 mm) holes along the repair area 0.90 in. (22,9 mm) intervals in axial direction and at 0.50 in. (12,7 mm) intervals in cross axial direction.
(c) Make sure the holes cover at least 1.00 in. (25,4 mm) more than the unbonded area.
(3) Remove the adhesive material from the unbonded area.
(a) Remove the adhesive material from the unbonded area on the underside of the perforated skin using a locally manufactured tool and
VACUUM CLEANER.
(b) The tool may either be a hand tool or fitted to an angle drill (maximum speed 300 rpm). Be careful not to cause damage to the inner surface of the fan case assembly.
(c) When carrying out this TASK, use a piece of suitable clear plastic with a slot and hole so as to press downwards on the outer side of the skin whilst at the same time pulling upwards onto the underside of the skin with the tool. This will balance the forces on the skin and prevent further accidental skin unbond
(d) Do not carry out this TASK more than is necessary to remove the adhesive or the skin may be totally machined away.
(4) Make sure the remaining skin surface is smooth. All burrs on the edge of holes must be removed with the waterproof silicon carbide (Material No.V05-020) .
(5) Remove the remaining debris.
WARNING:
DO NOT OPERATE WITHOUT SAFETY GOGGLES AND OTHER GUARD EQUIPMENT. FLYING PARTICLES CAN CAUSE INJURY.
(a) Remove the remaining debris with dry air blast and/or vacuum cleaner. (6) Mask the repair area with the adhesive tape (Material No.V02-005) . Make sure the adhesive tape covers at least 0.17 in. (4,3 mm) more than hole diameter.
B. Remove the grease from the repair area.
(1) Use syringe (Material No.V02-162) or equivalent andV01-076 Methyl Ethyl Ketone, Technical grade V01-124 Isopropyl Alcohol, Technical grade
(2) Use a clean lint free cloth, made moist withV01-076 Methyl Ethyl Ketone, Technical grade V01-124 Isopropyl Alcohol, Technical grade
(3) Immediately dry the repair area with a clean dry air blast.
Subtask 72-32-85-350-085-A ** ON A/C NOT FOR ALL (1) Use syringe (Material No.V02-162) or equivalent and
(2) Use a clean lint free cloth, made moist with
(3) Immediately dry the repair area with a clean dry air blast.
C. Prepare sealant material (when using V08-024 sealant and V08-125 sealant).
(2) If using a sealant (Material No.V08-125) , prepare either by hand, or using a mixing machine as described in the manufacturer's leaflet.
(3) If using a sealant (Material No.V08-024) , measure 75 parts of base compound and 10 parts of curing compound (accelerator) by weight.
(4) If using a sealant (Material No.V08-024) , knead the two parts together until the paste is a constant color with the putty knife or equivalent. No streaks are permitted.
Subtask 72-32-85-350-086-A ** ON A/C NOT FOR ALL WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
(1) Use sealant (Material No.V08-024) or sealant (Material No.V08-125) . This is supplied in several forms. The preferred form is SEMKIT B1/2 (material No.V08-125), alternative is the tin form (material No. V08-024). (2) If using a sealant (Material No.V08-125) , prepare either by hand, or using a mixing machine as described in the manufacturer's leaflet.
(3) If using a sealant (Material No.V08-024) , measure 75 parts of base compound and 10 parts of curing compound (accelerator) by weight.
(4) If using a sealant (Material No.V08-024) , knead the two parts together until the paste is a constant color with the putty knife or equivalent. No streaks are permitted.
NOTE: When mixed the life of the sealant is approximately half an hour at 77 deg.F (25 deg.C) using V08-024 sealant.
NOTE: Sealant cure times with a relative humidity of 50 percent.
D. Prepare sealant material (when using V08-115 sealant).
(2) If using a SEMKIT, prepare either by hand, or using a mixing machine as described in the manufacturer's leaflet.
(3) If using the tin form, measure 75 parts of base compound and 10 parts of curing compound (accelerator) by weight.
(4) If using the tin form, knead the two parts together until the paste is a constant color with the putty knife or equivalent. No streaks are permitted.
Subtask 72-32-85-340-194-A ** ON A/C NOT FOR ALL WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
(1) Use sealant (Material No.V08-115) . This is supplied in several forms. The preferred form is SEMKIT B2, alternative is the tin form. (2) If using a SEMKIT, prepare either by hand, or using a mixing machine as described in the manufacturer's leaflet.
(3) If using the tin form, measure 75 parts of base compound and 10 parts of curing compound (accelerator) by weight.
(4) If using the tin form, knead the two parts together until the paste is a constant color with the putty knife or equivalent. No streaks are permitted.
NOTE: When mixed the life of the sealant is approximately 2 hours at 77 deg.F (25 deg.C) using V08-024 sealant.
NOTE: Sealant cure times with a relative humidity of 50 percent.
E. Apply sealant material (when using V08-024 sealant or V08-125).
(1) Use the GUN - SEALANT to put the V08-024 sealant or V08-125 sealant into the repair area. Stop injecting when sealant material appears in the holes.
(2) When the sealant starts to feel hard, remove the unnecessary sealant material and adhesive tape.
(3) Place release film (Material No.V02-223) (non-porous) over the repair area and hold it in place with teflon tape (Material No.V02-160) .
(4) Apply pressure to keep contact between the repair area perforated skin and the aluminum honeycomb during the sealant cure cycle with teflon tape (Material No.V02-160) or equivalent, if necessary.
(5) Let the sealant cure.
Subtask 72-32-85-340-195-A ** ON A/C NOT FOR ALL (1) Use the GUN - SEALANT to put the V08-024 sealant or V08-125 sealant into the repair area. Stop injecting when sealant material appears in the holes.
(2) When the sealant starts to feel hard, remove the unnecessary sealant material and adhesive tape.
(3) Place release film (Material No.V02-223) (non-porous) over the repair area and hold it in place with teflon tape (Material No.V02-160) .
(4) Apply pressure to keep contact between the repair area perforated skin and the aluminum honeycomb during the sealant cure cycle with teflon tape (Material No.V02-160) or equivalent, if necessary.
(5) Let the sealant cure.
CAUTION:
THE MAXIMUM TEMPERATURE WHICH CAN BE USED TO CURE THE SEALANT IS 120 DEG.F (49 DEG.C)
(a) Let the sealant cure the V08-024 sealant or V08-125 sealant by heating to 113 deg.F (45 deg.C) for approximately 1.5 hours. NOTE: The minimum cure time is 1.5 hours. Sealant cure times with a relative humidity of 50 percent.
(6) Remove the release film, teflon tape and applied pressure source from the repair area and remove all the masking materials from the engine. F. Apply sealant material (when using V08-115 sealant).
(1) Use the air powered sealant gun to put the sealant (Material No.V08-115) into the repair area. Stop injecting when sealant material appears in the holes.
(2) When the sealant starts to feel hard, remove the unnecessary sealant material and adhesive tape.
(3) Place release film (Material No.V02-223) (non-porous) over the repair area and hold it in place with teflon tape (Material No.V02-160) .
(4) Apply pressure to keep contact between the repair area perforated skin and the aluminum honeycomb during the sealant cure cycle with teflon tape (Material No.V02-160) or equivalent, if necessary.
(5) Let the sealant cure.
Subtask 72-32-85-210-128-A ** ON A/C NOT FOR ALL (1) Use the air powered sealant gun to put the sealant (Material No.V08-115) into the repair area. Stop injecting when sealant material appears in the holes.
(2) When the sealant starts to feel hard, remove the unnecessary sealant material and adhesive tape.
(3) Place release film (Material No.V02-223) (non-porous) over the repair area and hold it in place with teflon tape (Material No.V02-160) .
(4) Apply pressure to keep contact between the repair area perforated skin and the aluminum honeycomb during the sealant cure cycle with teflon tape (Material No.V02-160) or equivalent, if necessary.
(5) Let the sealant cure.
CAUTION:
THE MAXIMUM TEMPERATURE WHICH CAN BE USED TO CURE THE SEALANT IS 120 DEG.F (49 DEG.C)
(a) Let the sealant cure the V08-115 sealant heat to 113 deg.F (45 deg.C) for approximately 3 hours. NOTE: The minimum cure time is 3 hours. Sealant cure times with a relative humidify of 50 percent.
(6) Remove the release film, teflon tape and applied pressure source from the repair area and remove all the masking materials from the engine. G. Examine the surface of repair area.
(1) Visually examine the completed repair to be sure all the requirements of this procedure are done.
(2) Repeat the tap test method to ensure that full bonding of the repaired area has been achieved. If necessary, repeat the repair procedure again.
dress the sealant material with the waterproof silicon carbide (Material No.V05-020) or equivalent, if necessary.
(4) If the repaired area is more than 30 percent of total acoustic lining, replace within 10 flight hours or 5 flight cycles whichever is sooner - repair, refer to VRS1845 (Ref. AMM TASK 72-32-85-300-020).
5. Close-up(1) Visually examine the completed repair to be sure all the requirements of this procedure are done.
(2) Repeat the tap test method to ensure that full bonding of the repaired area has been achieved. If necessary, repeat the repair procedure again.
NOTE: The sound of a successfully repaired area will differ from a fully bonded area. The sound will be less metallic. IAE1N20444 TOOL-TAPPING may be used.
(3) If the remaining sealant material after repair exceeds the limit dress the sealant material with the waterproof silicon carbide (Material No.V05-020) or equivalent, if necessary.
(4) If the repaired area is more than 30 percent of total acoustic lining, replace within 10 flight hours or 5 flight cycles whichever is sooner - repair, refer to VRS1845 (Ref. AMM TASK 72-32-85-300-020).
Subtask 72-32-85-410-110-A ** ON A/C NOT FOR ALL
A. Install the LP compressor (Fan) module (Ref. AMM TASK 72-31-00-400-010) or install the Low Pressure Compressor blades and fillers (Ref. AMM TASK 72-31-11-400-010).
Subtask 72-32-85-942-112-A ** ON A/C NOT FOR ALL B. Remove the Ground Support Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the workmat from the fan case.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the workmat from the fan case.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).