DOC AIRBUS | AMM A320FPartial Replacement of the Abradable Liner with Square/Rectangular Patches [CFMB]
TASK 72-23-00-300-806-A
Partial Replacement of the Abradable Liner with Square/Rectangular Patches
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 72-23-00-942-052-A ** ON A/C NOT FOR ALL
Subtask 72-23-00-320-066-A ** ON A/C NOT FOR ALL
Subtask 72-23-00-410-136-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:42:08 UTC
Partial Replacement of the Abradable Liner with Square/Rectangular Patches
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
CAUTION:
DURING THE REPAIR OF THE ABRADABLE LINER OF THE FAN INLET CASE, MAKE SURE THAT:
1. Reason for the Job- THE AREA STAYS DRY, WITHOUT DUST AND WELL VENTILATED
- THE TEMPERATURE STAYS BETWEEN 64 DEG.F (18 DEG.C) AND 82 DEG.F (28 DEG.C)
- THE RELATIVE HUMIDITY STAYS BETWEEN 40 AND 70 PERCENT.
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE |
| No specific | 1 | AIR SOURCE FILTERED, DRY |
| No specific | 1 | DETECTOR - LEAK, ULTRASONIC |
| No specific | 1 | HEATING ELEMENT |
| No specific | 1 | HEATING PANEL |
| No specific | 1 | MAT - PROTECTIVE |
| No specific | 1 | PAINTBRUSH |
| No specific | 1 | PUMP - VACUUM |
| No specific | 1 | SANDER - ORBITAL, AIR |
| No specific | 1 | SCALPEL |
| No specific | 1 | VACUUM CLEANER |
| No specific | 1 | VACUUM EQUIPMENT 0 TO 1 BAR (15 PSI) |
| No specific | 1 | VALVE - VACUUM |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP1039) | acetone |
| (Material No.CP1041) | isopropyl alcohol |
| (Material No.CP2244) | primer 1200 |
| (Material No.CP2297) | RTV 147 A |
| (Material No.CP2298) | Catalyst 147 B |
| (Material No.CP2349) | vacuum bag sealant |
| (Material No.CP2350) | breather cloth |
| (Material No.CP2351) | vacuum bag film |
| (Material No.CP2507) | perforated stretch release film |
| (Material No.CP2508) | flashbreaker tape |
| (Material No.CP2509) | tape |
| (Material No.CP2674) | lint-free cloth |
| (Material No.CP2772) | abrasive cloth |
| (Material No.CP5061) | temporary marking |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 72-21-00-000-005-A | Removal of the Spinner Front Cone |
| TASK 72-21-00-000-006-A | Removal of the Spinner Rear Cone |
| TASK 72-21-00-000-007-A | Removal of the Fan Rotor Blades |
| TASK 72-21-00-400-005-A | Installation of the Spinner Front Cone |
| TASK 72-21-00-400-006-A | Installation of the Spinner Rear Cone |
| TASK 72-21-00-400-007-A | Installation of the Fan Rotor Blades |
| TASK 72-23-00-000-009-A | Removal of the Forward Acoustical Panels of the Fan |
| TASK 72-23-00-000-025-A | Removal of the Mid Acoustical Panels |
| TASK 72-23-00-210-003-C | Detailed Inspection of Spinner, Engine Inlet, Fan Blades, Fan Outlet and Abradable Material |
| TASK 72-23-00-400-009-A | Installation of the Forward Acoustical Panels of the Fan |
| TASK 72-23-00-400-025-A | Installation of the Mid Acoustical Panels |
| SPM 703200230001 | |
| SPM 703223230012 | |
| SPM 704100350008 | |
| SPM 704111350009 | |
| SPM 705300110022 | |
| SPM 705311110023 | |
| SPM 706613380025 | |
Fan Inlet Case - Abradable Liner Square/Rectangular PatchSubtask 72-23-00-942-052-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On 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) in position to tell persons not to energize FADEC 1(2).
Subtask 72-23-00-010-144-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On 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) in position to tell persons not to energize FADEC 1(2).
B. Get Access
(1) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
(2) Install the MAT - PROTECTIVE in the lower half of the inlet cowl.
(3) Remove the spinner front cone (Ref. AMM TASK 72-21-00-000-005).
(4) Remove the spinner rear cone (Ref. AMM TASK 72-21-00-000-006).
4. Procedure(1) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
(2) Install the MAT - PROTECTIVE in the lower half of the inlet cowl.
(3) Remove the spinner front cone (Ref. AMM TASK 72-21-00-000-005).
(4) Remove the spinner rear cone (Ref. AMM TASK 72-21-00-000-006).
Subtask 72-23-00-320-066-A ** ON A/C NOT FOR ALL
A. Repair the damaged areas of the abradable liner.
(1) Measure the clearance between the fan blade tip and the abradable liner at eight equally spaced locations as follows:
(a) Use the No. 1 fan blade as a reference.
(b) Make a record of the dimensions.
(2) Remove a sufficient amount of fan blades to get access to the repair area (Ref. AMM TASK 72-21-00-000-007).
(3) Remove the forward and middle acoustic panels as follows:
(b) Remove the middle acoustic panels (Ref. AMM TASK 72-23-00-000-025).
(4) Use temporary marking (Material No.CP5061) and put a mark on the abradable liner around the damaged area.
(a) Make the cut on the marking around the damaged/repair area.
(b) Continue to make cuts to remove as much of the damaged abradable liner material as possible.
(c) After you remove the damaged abradable liner material, make sure that the total accumulative length of the repair area in the circumferential direction is 70.0 in. (1.778 m) or less.
(6) Alternative procedure:
(a) Use the SANDER - ORBITAL, AIR, with size 80 or 150 abrasive belt, to cut the abradable liner material to the base metal at the location of the damage as follows:
1 Make the cut on the marking around the damaged/repair area.
2 Continue to make cuts to remove as much of the damaged abradable liner as possible.
3 After the removal of the damaged abradable liner, make sure that the total accumulative length of the repair area in the circumferential direction is 70 in. (1.778 m) or less.
4 Use abrasive cloth (Material No.CP2772) 80 or 120 grit, to remove all the abradable liner material that you could not remove with the SANDER - ORBITAL, AIR from the repair area.
(7) Removal of the unwanted pieces of abradable liner material, dust and hand sanding residue.
Subtask 72-23-00-110-056-A ** ON A/C NOT FOR ALL (1) Measure the clearance between the fan blade tip and the abradable liner at eight equally spaced locations as follows:
(a) Use the No. 1 fan blade as a reference.
(b) Make a record of the dimensions.
(2) Remove a sufficient amount of fan blades to get access to the repair area (Ref. AMM TASK 72-21-00-000-007).
(3) Remove the forward and middle acoustic panels as follows:
CAUTION:
WHEN YOU REMOVE THE ACOUSTIC PANELS, BE CAREFUL NOT TO CAUSE SCRATCHES TO THE FAN CASE.
(a) Remove the forward acoustic panels (Ref. AMM TASK 72-23-00-000-009). (b) Remove the middle acoustic panels (Ref. AMM TASK 72-23-00-000-025).
(4) Use temporary marking (Material No.CP5061) and put a mark on the abradable liner around the damaged area.
WARNING:
BE CAREFUL WHEN YOU USE SHARP OR POINTED TOOLS. THESE TOOLS CAN CAUSE AN INJURY TO YOU.
(5) Use a SCALPEL to cut the abradable liner material to the base metal at the location of the damage as follows: (a) Make the cut on the marking around the damaged/repair area.
(b) Continue to make cuts to remove as much of the damaged abradable liner material as possible.
(c) After you remove the damaged abradable liner material, make sure that the total accumulative length of the repair area in the circumferential direction is 70.0 in. (1.778 m) or less.
WARNING:
WHEN YOU DRILL, MACHINE, BLEND, GRIND OR SAND PARTS, USE PROTECTIVE CLOTHING, GLOVES, DUST MASK AND GOGGLES.
BE CAREFUL NOT TO BREATHE THE DUST OR LET IT TOUCH YOUR SKIN.
DUST AND PARTICLES ARE DANGEROUS FOR YOUR HEALTH.
(d) Use abrasive cloth (Material No.CP2772) , 80 or 120 grit, and sand to remove all the remaining abradable liner material that you could not remove with the SCALPEL from the repair area. (6) Alternative procedure:
(a) Use the SANDER - ORBITAL, AIR, with size 80 or 150 abrasive belt, to cut the abradable liner material to the base metal at the location of the damage as follows:
1 Make the cut on the marking around the damaged/repair area.
2 Continue to make cuts to remove as much of the damaged abradable liner as possible.
3 After the removal of the damaged abradable liner, make sure that the total accumulative length of the repair area in the circumferential direction is 70 in. (1.778 m) or less.
4 Use abrasive cloth (Material No.CP2772) 80 or 120 grit, to remove all the abradable liner material that you could not remove with the SANDER - ORBITAL, AIR from the repair area.
(7) Removal of the unwanted pieces of abradable liner material, dust and hand sanding residue.
WARNING:
WHEN YOU USE COMPRESSED AIR:
(a) Use clean shop AIR SOURCE FILTERED, DRY or a VACUUM CLEANER to remove all the unwanted pieces of the abradable liner material, dust and hand sanding residue. - USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS
- DO NOT LET THE PRESSURE BE MORE THAN 30 PSIG (200 KPA).
B. Clean the repair area with acetone (Material No.CP1039) or isopropyl alcohol (Material No.CP1041) .
Subtask 72-23-00-350-067-A ** ON A/C NOT FOR ALL C. Etch the fan case repair areas SPM 705300110022 SPM 705311110023 as follows:
(1) Use class B etchant.
(2) Etchant is only permitted in the case repair areas.
(a) Do not let the etchant soak into the remaining abradable liner.
Subtask 72-23-00-230-051-A ** ON A/C NOT FOR ALL (1) Use class B etchant.
(2) Etchant is only permitted in the case repair areas.
(a) Do not let the etchant soak into the remaining abradable liner.
D. Do an inspection of the case repair area SPM 703200230001 SPM 703223230012 as follows:
(2) Indications of 0.015 in. (0.38 mm) or less are permitted.
(3) Penetrant is only permitted in the case repair areas.
(a) Do not let the penetrant soak into the remaining abradable liner.
Subtask 72-23-00-220-051-A ** ON A/C NOT FOR ALL CAUTION:
WHEN YOU APPLY PENETRANT, BE CAREFUL NOT TO CAUSE CONTAMINATION TO THE ADJACENT ABRADABLE MATERIAL. IF YOU DO, DAMAGE TO THE ABRADABLE MATERIAL CAN OCCUR.
(1) Use class D penetrant. (2) Indications of 0.015 in. (0.38 mm) or less are permitted.
(3) Penetrant is only permitted in the case repair areas.
(a) Do not let the penetrant soak into the remaining abradable liner.
E. Do a dimensional inspection of the case repair area.
(1) If you find damage in the case repair area or if the case does not agree with the minimum wall thickness, the case is not repairable with this procedure.
Subtask 72-23-00-110-057-A ** ON A/C NOT FOR ALL (1) If you find damage in the case repair area or if the case does not agree with the minimum wall thickness, the case is not repairable with this procedure.
F. Clean the case repair area with acetone (Material No.CP1039) or isopropyl alcohol (Material No.CP1041) .
Subtask 72-23-00-350-068-A ** ON A/C NOT FOR ALL G. Sand the case repair area as follows:
(2) Alternative procedure:
(a) Use the SANDER - ORBITAL, AIR, with size 80 or 150 abrasive belt, to lightly sand the case.
(3) Do not decrease the case wall thickness to less than the minimum finish dimensions.
(4) Removal of the unwanted pieces of abradable liner material and loose grit.
Subtask 72-23-00-340-056-A ** ON A/C NOT FOR ALL WARNING:
WHEN YOU DRILL, MACHINE, BLEND, GRIND OR SAND PARTS, USE PROTECTIVE CLOTHING, GLOVES, DUST MASK AND GOGGLES.
BE CAREFUL NOT TO BREATHE THE DUST OR LET IT TOUCH YOUR SKIN.
DUST AND PARTICLES ARE DANGEROUS FOR YOUR HEALTH.
CAUTION:
REMOVE ONLY THE MINIMUM QUANTITY OF MATERIAL NECESSARY. IF YOU REMOVE TOO MUCH MATERIAL, DAMAGE TO THE CASE CAN OCCUR.
(1) Use abrasive cloth (Material No.CP2772) , 80 or 120 grit, to make the surface of the case rough. (2) Alternative procedure:
(a) Use the SANDER - ORBITAL, AIR, with size 80 or 150 abrasive belt, to lightly sand the case.
(3) Do not decrease the case wall thickness to less than the minimum finish dimensions.
(4) Removal of the unwanted pieces of abradable liner material and loose grit.
WARNING:
WHEN YOU USE COMPRESSED AIR:
(a) Use clean shop AIR SOURCE FILTERED, DRY or a VACUUM CLEANER to remove all the unwanted pieces of the abradable liner and loose grit. - USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS
- DO NOT LET THE PRESSURE BE MORE THAN 30 PSIG (200 KPA).
H. Apply the abradable liner square/rectangular patch to the case repair area as follows:
(1) Prepare the abradable liner square/rectangular patch as follows:
(a) From a (spare) new fan inlet case abradable cartridge, cut the square/rectangular patch.
1 Make sure that the maximum accumulated length of the patch is 70 in. (1.778 m).
(c) Cut the two ends of the square/rectangular patch with a SCALPEL to make it agree with the adjacent edges of the abradable liner.
1 Use abrasive cloth (Material No.CP2772) , 80 or 120 grit, to make the surface of the abradable liner rough.
(e) Alternative procedure:
1 Sand the convex surface and the bonding faces of the abradable liner square/rectangular patch as follows:
a Use the SANDER - ORBITAL, AIR, with size 80 or 150 abrasive belt, to lightly sand the abradable liner.
(2) Remove the grease from the case repair area and the abradable liner square/rectangular with a clean white lint-free cloth (Material No.CP2674) soaked in acetone (Material No.CP1039) or isopropyl alcohol (Material No.CP1041) and do as follows:
(a) Wait 30 minutes before you apply the primer.
(3) Apply primer 1200 (Material No.CP2244) on the case as follows:
(b) Dry at a temperature between 64 deg.F (18 deg.C) and 82 deg.F (28 deg.C) for 45 minutes and do as follows:
1 Bond the patch one hour or less after the primer is dry.
(a) Mix ten parts of Catalyst 147 B (Material No.CP2298) with 100 parts of RTV 147 A (Material No.CP2297) at a temperature range between 64 deg.F (18 deg.C) and 82 deg.F (28 deg.C).
(b) Mix the bonding compound slowly to prevent air bubbles.
(c) Mix the bonding compound manually or mechanically to get a homogeneous bonding compound.
(d) Make sure that the bonding compound does not contain air bubbles.
(5) Carefully put the abradable liner square/rectangular patch in the correct position in the case as follows:
(a) To prevent air entrapment, apply one end of the abradable liner square/rectangular patch first, then the other.
Subtask 72-23-00-340-057-A ** ON A/C NOT FOR ALL (1) Prepare the abradable liner square/rectangular patch as follows:
(a) From a (spare) new fan inlet case abradable cartridge, cut the square/rectangular patch.
WARNING:
BE CAREFUL WHEN YOU USE SHARP OR POINTED TOOLS. THESE TOOLS CAN CAUSE AN INJURY TO YOU.
(b) Cut the square/rectangular patch with a length of approximately 0.4 in. (10 mm) longer than the full length of the repair area. 1 Make sure that the maximum accumulated length of the patch is 70 in. (1.778 m).
(c) Cut the two ends of the square/rectangular patch with a SCALPEL to make it agree with the adjacent edges of the abradable liner.
WARNING:
WHEN YOU DRILL, MACHINE, BLEND, GRIND OR SAND PARTS, USE PROTECTIVE CLOTHING, GLOVES, DUST MASK AND GOGGLES.
BE CAREFUL NOT TO BREATHE THE DUST OR LET IT TOUCH YOUR SKIN.
DUST AND PARTICLES ARE DANGEROUS FOR YOUR HEALTH.
(d) Sand the convex surface and the bonding faces of the abradable liner square/rectangular patch as follows: 1 Use abrasive cloth (Material No.CP2772) , 80 or 120 grit, to make the surface of the abradable liner rough.
(e) Alternative procedure:
1 Sand the convex surface and the bonding faces of the abradable liner square/rectangular patch as follows:
a Use the SANDER - ORBITAL, AIR, with size 80 or 150 abrasive belt, to lightly sand the abradable liner.
(2) Remove the grease from the case repair area and the abradable liner square/rectangular with a clean white lint-free cloth (Material No.CP2674) soaked in acetone (Material No.CP1039) or isopropyl alcohol (Material No.CP1041) and do as follows:
(a) Wait 30 minutes before you apply the primer.
(3) Apply primer 1200 (Material No.CP2244) on the case as follows:
CAUTION:
BEFORE YOU APPLY THE PRIMER, MAKE SURE THAT THE REPAIR AREA IS FULLY CLEAN AND WITHOUT OIL PARTICLES.
WHEN YOU APPLY THE PRIMER, BE CAREFUL NOT TO APPLY TOO MUCH OF IT.
AFTER YOU APPLIED THE PRIMER, BE CAREFUL NOT TO TOUCH IT.
IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN DECREASE THE ADHERENCE OF THE PATCH TO THE CASE.
(a) Apply primer 1200 (Material No.CP2244) with a lint-free cloth (Material No.CP2674) or a clean PAINTBRUSH on the rough area without grease. (b) Dry at a temperature between 64 deg.F (18 deg.C) and 82 deg.F (28 deg.C) for 45 minutes and do as follows:
1 Bond the patch one hour or less after the primer is dry.
CAUTION:
USE THE BONDING COMPOUND LESS THAN 2 HOURS AFTER MIXING. IF YOU DO NOT OBEY THIS INSTRUCTION, THE BONDING OF THE ABRADABLE LINER PATCHES WILL NOT BE SATISFACTORY.
(4) Prepare the bonding compound SPM 706613380025 as follows: (a) Mix ten parts of Catalyst 147 B (Material No.CP2298) with 100 parts of RTV 147 A (Material No.CP2297) at a temperature range between 64 deg.F (18 deg.C) and 82 deg.F (28 deg.C).
(b) Mix the bonding compound slowly to prevent air bubbles.
(c) Mix the bonding compound manually or mechanically to get a homogeneous bonding compound.
(d) Make sure that the bonding compound does not contain air bubbles.
(5) Carefully put the abradable liner square/rectangular patch in the correct position in the case as follows:
(a) To prevent air entrapment, apply one end of the abradable liner square/rectangular patch first, then the other.
I. Cure the abradable liner square/rectangular patch as follows:
(1) Install the vacuum bag in the case as follows:
(a) Use a flashbreaker tape (Material No.CP2508) to seal the holes with a plug and tape (Material No.CP2509) to put a cover on the holes.
(b) Install a minimum of two equally spaced thermocouples around the repair area and a thermocouple on the outside of the case.
(c) Cut the perforated stretch release film (Material No.CP2507) to the necessary dimensions and do as follows:
1 Install the perforated stretch release film (Material No.CP2507) and use tape (Material No.CP2509) to hold it in the correct position.
(d) Install a flexible HEATING ELEMENT unit as near as possible to the abradable liner.
(e) Cut the vacuum bag film (Material No.CP2351) to the necessary dimensions and do as follows:
1 Install the breather cloth (Material No.CP2350) and use tape (Material No.CP2509) to hold it in the correct position.
(f) Apply vacuum bag sealant (Material No.CP2349) around the case.
(g) Cut the vacuum bag film (Material No.CP2351) to the necessary dimensions and do as follows:
1 Install the vacuum bag film (Material No.CP2351) and use vacuum bag sealant (Material No.CP2349) to hold it in the correct position.
(h) Make two holes in the vacuum bag film (Material No.CP2351) for the VALVE - VACUUM and the VACUUM EQUIPMENT 0 TO 1 BAR (15 PSI).
(i) Connect the VALVE - VACUUM to the PUMP - VACUUM using the hoses and connectors and make the vacuum as follows:
1 Make sure that the pressure is between 12 psi (1 bar) and 13 psi (1 bar).
(j) Use a DETECTOR - LEAK, ULTRASONIC to do a check of the vacuum as follows:
1 Install the perforated stretch release film (Material No.CP2507) and use tape (Material No.CP2509) to hold it in the correct position.
(2) Use the HEATING PANEL or HEATING ELEMENT to increase the temperature of the square/rectangular patch to between 194 deg.F (90 deg.C) and 212 deg.F (100 deg.C) to cure the bonding compound and do as follows:
(a) Keep this temperature for one hour and 15 minutes to one hour and 30 minutes.
(b) Make sure that the case reaches the correct temperature.
(3) Remove the vacuum bag materials and masking from the repair area.
Subtask 72-23-00-210-071-A ** ON A/C NOT FOR ALL (1) Install the vacuum bag in the case as follows:
(a) Use a flashbreaker tape (Material No.CP2508) to seal the holes with a plug and tape (Material No.CP2509) to put a cover on the holes.
(b) Install a minimum of two equally spaced thermocouples around the repair area and a thermocouple on the outside of the case.
(c) Cut the perforated stretch release film (Material No.CP2507) to the necessary dimensions and do as follows:
1 Install the perforated stretch release film (Material No.CP2507) and use tape (Material No.CP2509) to hold it in the correct position.
(d) Install a flexible HEATING ELEMENT unit as near as possible to the abradable liner.
(e) Cut the vacuum bag film (Material No.CP2351) to the necessary dimensions and do as follows:
1 Install the breather cloth (Material No.CP2350) and use tape (Material No.CP2509) to hold it in the correct position.
(f) Apply vacuum bag sealant (Material No.CP2349) around the case.
(g) Cut the vacuum bag film (Material No.CP2351) to the necessary dimensions and do as follows:
1 Install the vacuum bag film (Material No.CP2351) and use vacuum bag sealant (Material No.CP2349) to hold it in the correct position.
(h) Make two holes in the vacuum bag film (Material No.CP2351) for the VALVE - VACUUM and the VACUUM EQUIPMENT 0 TO 1 BAR (15 PSI).
(i) Connect the VALVE - VACUUM to the PUMP - VACUUM using the hoses and connectors and make the vacuum as follows:
1 Make sure that the pressure is between 12 psi (1 bar) and 13 psi (1 bar).
(j) Use a DETECTOR - LEAK, ULTRASONIC to do a check of the vacuum as follows:
1 Install the perforated stretch release film (Material No.CP2507) and use tape (Material No.CP2509) to hold it in the correct position.
(2) Use the HEATING PANEL or HEATING ELEMENT to increase the temperature of the square/rectangular patch to between 194 deg.F (90 deg.C) and 212 deg.F (100 deg.C) to cure the bonding compound and do as follows:
(a) Keep this temperature for one hour and 15 minutes to one hour and 30 minutes.
(b) Make sure that the case reaches the correct temperature.
(3) Remove the vacuum bag materials and masking from the repair area.
J. Do a quality check of the case repair area as follows:
(1) Examine all the joints and the patch areas to make sure that there is no porosity or caught air bubbles.
(2) If you find porosity or caught air bubbles, do the repair again.
Subtask 72-23-00-320-067-A ** ON A/C NOT FOR ALL (1) Examine all the joints and the patch areas to make sure that there is no porosity or caught air bubbles.
(2) If you find porosity or caught air bubbles, do the repair again.
K. Blend the abradable liner square/rectangular patch installed in the case SPM 704100350008 SPM 704111350009 as follows:
(2) Get the record of clearance measurements from Para. 4.A.(1).
(3) Blend the abradable liner repair area to the contour and dimensions of the adjacent areas.
Subtask 72-23-00-220-052-A ** ON A/C NOT FOR ALL WARNING:
WHEN YOU DRILL, MACHINE, BLEND, GRIND OR SAND PARTS, USE PROTECTIVE CLOTHING, GLOVES, DUST MASK AND GOGGLES.
BE CAREFUL NOT TO BREATHE THE DUST OR LET IT TOUCH YOUR SKIN.
DUST AND PARTICLES ARE DANGEROUS FOR YOUR HEALTH.
(1) Use abrasive cloth (Material No.CP2772) . (2) Get the record of clearance measurements from Para. 4.A.(1).
(3) Blend the abradable liner repair area to the contour and dimensions of the adjacent areas.
L. Do a final quality check of the abradable liner patch as follows:
(1) For scratches, scores, nicks and dents, apply the limits that follow:
(3) If the final quality check does not agree with the requirements, do the repair again.
Subtask 72-23-00-140-052-A ** ON A/C NOT FOR ALL (1) For scratches, scores, nicks and dents, apply the limits that follow:
- The length of a defect/damage: 0.196 in. (4.98 mm) or less
- The minimum distance between two damaged locations: 0.118 in. (3.0 mm)
- The maximum depth of the damage: 0.118 in. (3.00 mm) or less
- The number of damaged areas for 3.93 in.2 (2535.5 mm2): three or less.
(3) If the final quality check does not agree with the requirements, do the repair again.
M. Remove the loose abradable material and dust from the case repair area with a VACUUM CLEANER.
Subtask 72-23-00-950-051-A ** ON A/C NOT FOR ALL N. Remove all protective materials/masking tape from the case acoustical panels.
Subtask 72-23-00-420-083-A ** ON A/C NOT FOR ALL O. Install the forward and middle acoustical panel-screws with the correct torque (Ref. AMM TASK 72-23-00-400-009) and (Ref. AMM TASK 72-23-00-400-025).
Subtask 72-23-00-420-084-A ** ON A/C NOT FOR ALL 5. Close-upSubtask 72-23-00-410-136-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 spinner rear cone (Ref. AMM TASK 72-21-00-400-006).
(3) Install the spinner front cone (Ref. AMM TASK 72-21-00-400-005).
(4) Remove the MAT - PROTECTIVE from the inlet cowl.
(5) Remove the access platform(s).
(6) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the spinner rear cone (Ref. AMM TASK 72-21-00-400-006).
(3) Install the spinner front cone (Ref. AMM TASK 72-21-00-400-005).
(4) Remove the MAT - PROTECTIVE from the inlet cowl.
(5) Remove the access platform(s).
(6) Remove the WARNING NOTICE(S).