DOC AIRBUS | AMM A320FRepair of the LP Compressor Fan Disk, Re-apply Coating - VRS1974 [IAE]
TASK 72-31-12-300-012-A
Repair of the LP Compressor Fan Disk, Re-apply Coating - VRS1974
This TASK gives the procedure to re-apply the Dry Film Lubricant on the dovetail of the low pressure (LP) compressor fan disk.
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 72-31-12-941-058-A ** ON A/C NOT FOR ALL
Subtask 72-31-12-020-056-B ** ON A/C NOT FOR ALL
Subtask 72-31-12-942-055-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:45:07 UTC
Repair of the LP Compressor Fan Disk, Re-apply Coating - VRS1974
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobThis TASK gives the procedure to re-apply the Dry Film Lubricant on the dovetail of the low pressure (LP) compressor fan disk.
NOTE: It is recommended to apply this TASK in conjunction with Re-apply the Dry Film Lubricant (VRS1973) on the Low Pressure (LP) Compressor Fan Blades.
NOTE: The rapid re-lube system is the revised method of applying the dry film lubricant. A purpose-designed rapid Re-Lube Kit contains the cleaning and applicator tools for the re-lubrication of one fan blade set and fan disk. The Rapid Re-lube Kit is a disposable kit and must be disposed of accordingly after the fan blade set and fan disk have been re-lubricated.
NOTE: A logbook entry is necessary when you complete this repair.
2. Job Set-up InformationA. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | 1 | ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE |
| No specific | AR | MAT - WORK |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V01-031) | Acetone, Technical grade |
| (Material No.V01-124) | Isopropyl Alcohol, Technical grade |
| (Material No.V01-338) | Cleaning solvent |
| (Material No.V02-099) | lint free cloth |
| (Material No.V04-016) | dry film lubricant |
| (Material No.V04-017) | rapid re-lube kit |
| REFERENCE | DESIGNATION |
|---|---|
| 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 72-31-12-200-010-B | Inspection of the Stage 1 Fan Disk and the Rear Blade Retaining Ring |
LP Compressor Fan DiskSubtask 72-31-12-941-058-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 ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE to tell persons not to energize the FADEC 1(2).
(4) Put the support equipment into position:
(a) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position to give access to the engine.
(b) Put the MAT - WORK in position in the air intake cowl.
4. Procedure(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 ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE to tell persons not to energize the FADEC 1(2).
(4) Put the support equipment into position:
(a) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position to give access to the engine.
(b) Put the MAT - WORK in position in the air intake cowl.
NOTE: Make sure that the red warning pennants on the workmat can be seen external to the aircraft.
NOTE: Make sure that the workmat has sufficient dimensions to give full protection to the lower half of the air intake cowl.
Subtask 72-31-12-020-056-B ** ON A/C NOT FOR ALL
A. Remove the LP compressor fan blade from the stage 1 fan disk assembly (Ref. AMM TASK 72-31-11-000-010).
Subtask 72-31-12-110-051-A ** ON A/C NOT FOR ALL B. Clean the dovetail slot of Fan Disk.
(2) Remove the loose dry film lubricant. Use all 5 cleaning rollers to clean the fan disc slots. Discard the rollers once they have become dirty. It is acceptable to use the fan disc cleaning tool withV01-031 Acetone, Technical grade V01-124 Isopropyl Alcohol, Technical grade
(3) Discard the cleaning handle and rollers.
(4) Remove the grease. Use a clean lint free cloth made moist withV01-031 Acetone, Technical grade V01-124 Isopropyl Alcohol, Technical grade
Subtask 72-31-12-220-055-B ** ON A/C NOT FOR ALL Subtask 72-31-12-350-055-A ** ON A/C NOT FOR ALL CAUTION:
ONLY REMOVE THE LOOSE DRY FILM LUBRICANT. DO NOT REMOVE THE WELL-ADHERED DRY FILM LUBRICANT. ESPECIALLY, REMOVING IT MAY DAMAGE THE METCO COATING ON THE FAN BLADE ROOT IF THE FAN BLADE HAS THE COATING.
CAUTION:
DO NOT USE SCOTCHBRITE OR SIMILAR MATERIAL TO CLEAN THE FAN BLADE ROOT IF THE FAN BLADE HAS THE METCO COATING. IT WILL DAMAGE THE METCO COATING ON THE FAN BLADE ROOT.
(1) Assemble the fan disk cleaning tool. Use a rapid re-lube kit (Material No.V04-017) , fan disk cleaning handle and roller. (2) Remove the loose dry film lubricant. Use all 5 cleaning rollers to clean the fan disc slots. Discard the rollers once they have become dirty. It is acceptable to use the fan disc cleaning tool with
(3) Discard the cleaning handle and rollers.
(4) Remove the grease. Use a clean lint free cloth made moist with
D. Apply the dry film lubricant
(1) Assemble the fan disk applicator.
(a) Use a rapid re-lube kit (Material No.V04-017) , fan disk applicator handle and paint pads. Remove the excess fibers from the pads. Assemble the fan disk applicator handle and pad.
(b) Loose fibers must be removed from the paint pads as the fibers may be applied to the blade root within the dry film lubricant coat. Fibers in the coating are to be avoided where possible.
(2) Prepare the dry film lubricant. Use the dry dry film lubricant (Material No.V04-016) . Use a rapid re-lube kit (Material No. V04-017), paint tray. Shake the container for 1 minute before opening. Remove any congealed dry film lubricant from the container. Pour a small amount of the dry film lubricant into the paint tray, approximate diameter 1.5 in (40 mm.).
Place the applicator paint pad in the dovetail slot at the top-dead-center position of the disk. Place the paint pad on the left-hand-side surface of the dovetail slot, gently pushing left and up. Apply a coat of dry film lubricant to the left-hand-side surface with an even stroke along the full length of the dovetail slot and back. For example, from the front to the rear of the disc, and then from the rear to the front of the disc, while located on the left-hand-side surface.
Place the paint pad on the right-hand-side surface of the dovetail slot, gently pushing right and up. Apply a coat of dry film lubricant to the right-hand-side surface with an even stroke along the full length of the dovetail slot and back. For example, from the front to the rear of the disc, and then from the rear to the front of the disc, while located on the right-hand-side surface.
(5) Visually examine the dry film lubricant coating.
(a) Make sure the surface is evenly coated. Use a mirror and torch. If an area of BJ is uncoated and the dry film lubricant is not dry, then apply the dry film lubricant to the fan disk dovetail slot. Continue from Step D (4). If an area of BJ is uncoated and the dry film lubricant is dry, then the dry film lubricant must be removed. Use a lint free cloth (Material No.V02-099) made moist withV01-031 Acetone, Technical grade V01-124 Isopropyl Alcohol, Technical grade
(b) Do a check of the dry film lubricant coating, after each coating, for fibers. If the coating contains more than 5 fibers per 0.155 sqin (1 sqcm.), then remove the dry film lubricant coating. Use a lint free cloth (Material No.V02-099) made moist withV01-031 Acetone, Technical grade V01-124 Isopropyl Alcohol, Technical grade
(c) Do a check of the fan blade root and shear key slot for drips. Remove all drips. Use a lint free cloth (Material No.V02-099) made moist withV01-031 Acetone, Technical grade V01-124 Isopropyl Alcohol, Technical grade
(6) Apply the dry film lubricant to the remaining fan disk dovetail slots. Repeat Step D (1) to Step D (6).
(7) Cure the dry film lubricant for a minimum of 30 minutes at room temperature.
(8) Discard the applicator tool.
Subtask 72-31-12-420-055-B ** ON A/C NOT FOR ALL (1) Assemble the fan disk applicator.
(a) Use a rapid re-lube kit (Material No.V04-017) , fan disk applicator handle and paint pads. Remove the excess fibers from the pads. Assemble the fan disk applicator handle and pad.
(b) Loose fibers must be removed from the paint pads as the fibers may be applied to the blade root within the dry film lubricant coat. Fibers in the coating are to be avoided where possible.
(2) Prepare the dry film lubricant. Use the dry dry film lubricant (Material No.V04-016) . Use a rapid re-lube kit (Material No. V04-017), paint tray. Shake the container for 1 minute before opening. Remove any congealed dry film lubricant from the container. Pour a small amount of the dry film lubricant into the paint tray, approximate diameter 1.5 in (40 mm.).
NOTE: A small amount of the dry film lubricant must be poured into a paint tray in order to avoid the dry film lubricant drying quickly.
NOTE: Before topping up the paint tray with the dry film lubricant, any dried lubricant must be removed from the paint tray. If the dried dry film lubricant remains on the tray, the dried dry film lubricant can cause contamination of the dry film lubricant and inconsistencies in both coating quality and thickness.
(3) Load the pad with the dry film lubricant for each slot application. Make sure all the paint pad fibers are coated with the dry film lubricant. Remove the excess dry film lubricant using the edge of the paint tray until the paint pad is an even dark gray color. Do not overload the paint pad as this will result in drips when the dry film lubricant is applied to the fan blade root. CAUTION:
THE APPLICATOR PAINT PAD MUST BE REPLACED AFTER EVERY 6 DOVETAIL SLOTS RE-LUBRICATIONS, AS THE PAINT PAD FIBERS BECOME STICKY AND THE PAD DETERIORATES.
(4) Apply the dry film lubricant to each dovetail slot. Make sure it is applied at the top-dead-center position of the fan disk. Rotate the disk to locate the dovetail slot at this position before starting the application process. Place the applicator paint pad in the dovetail slot at the top-dead-center position of the disk. Place the paint pad on the left-hand-side surface of the dovetail slot, gently pushing left and up. Apply a coat of dry film lubricant to the left-hand-side surface with an even stroke along the full length of the dovetail slot and back. For example, from the front to the rear of the disc, and then from the rear to the front of the disc, while located on the left-hand-side surface.
Place the paint pad on the right-hand-side surface of the dovetail slot, gently pushing right and up. Apply a coat of dry film lubricant to the right-hand-side surface with an even stroke along the full length of the dovetail slot and back. For example, from the front to the rear of the disc, and then from the rear to the front of the disc, while located on the right-hand-side surface.
(5) Visually examine the dry film lubricant coating.
(a) Make sure the surface is evenly coated. Use a mirror and torch. If an area of BJ is uncoated and the dry film lubricant is not dry, then apply the dry film lubricant to the fan disk dovetail slot. Continue from Step D (4). If an area of BJ is uncoated and the dry film lubricant is dry, then the dry film lubricant must be removed. Use a lint free cloth (Material No.V02-099) made moist with
(b) Do a check of the dry film lubricant coating, after each coating, for fibers. If the coating contains more than 5 fibers per 0.155 sqin (1 sqcm.), then remove the dry film lubricant coating. Use a lint free cloth (Material No.V02-099) made moist with
(c) Do a check of the fan blade root and shear key slot for drips. Remove all drips. Use a lint free cloth (Material No.V02-099) made moist with
(6) Apply the dry film lubricant to the remaining fan disk dovetail slots. Repeat Step D (1) to Step D (6).
(7) Cure the dry film lubricant for a minimum of 30 minutes at room temperature.
(8) Discard the applicator tool.
E. Install the LP compressor fan blade on the stage 1 fan disk assembly (Ref. AMM TASK 72-31-11-400-010).
Subtask 72-31-12-350-056-A ** ON A/C NOT FOR ALL F. Identify the repair.
(1) A logbook entry is necessary when you have touched up the slot surface. Write VRS1974 in the engine logbook.
5. Close-up(1) A logbook entry is necessary when you have touched up the slot surface. Write VRS1974 in the engine logbook.
Subtask 72-31-12-942-055-A ** ON A/C NOT FOR ALL
A. Remove the ground support equipment
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Remove the workmat from the engine air intake.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Remove the workmat from the engine air intake.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).