W DOC AIRBUS | AMM A320F

Do an Erosion Coat Touch-Up Repair of the Fan Blade Assembly - Base Coat [PW11]

TASK 72-11-03-320-805-A
Do an Erosion Coat Touch-Up Repair of the Fan Blade Assembly - Base Coat

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
WARNING: USE PROTECTIVE GLOVES TO PREVENT POSSIBLE INJURY TO THE HANDS WHEN YOU TOUCH OR HOLD THE FAN BLADES. THE BLADE EDGES ARE SHARP AND CAN CUT THE HANDS.
CAUTION: USE MAXIMUM CAUTION WITH ANY ELECTRICAL EQUIPMENT IN THE AREA OF THE BLADE. CONTACT WITH ANY ELECTRICAL SOURCE THAT CAN PASS CURRENT TO THE BLADE SURFACE CAN CAUSE AN ARC BURN. AN ARC BURN CAN CAUSE LOCAL DEGRADATION OF MATERIAL PROPERTIES AND BEGIN A CRACK.
CAUTION: DO NOT REMOVE POLYURETHANE COAT THAT IS TIGHTLY BONDED. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE FAN BLADE CAN OCCUR.
CAUTION: MAKE SURE THAT THE BLADE SURFACE HAS NO NICKS, SCRATCHES OR OTHER SIGNS OF DAMAGE WHEN YOU USE A RAZOR BLADE OR DURING THE REPAIR PROCEDURE. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE FAN BLADE CAN OCCUR.
CAUTION: DO NOT REMOVE MATERIAL FROM THE FAN BLADE BASE MATERIAL. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE FAN BLADE CAN OCCUR.
CAUTION: DO NOT USE MATERIALS OR TOOLING THAT CONTAIN SILICONE. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE FAN BLADE CAN OCCUR.
CAUTION: DO NOT APPLY ACETONE DIRECTLY TO A BLADE. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE BLADE CAN OCCUR.
ZONE: 400
1. Reason for the Job
Use this repair procedure to locally touch-up repair the damage on the erosion coat of the fan blade assembly.
For more information about the fan rotor assembly, refer to (72-11-00-00U).
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
BLADE - RAZOR
No specific
1
KNIFE- RAZOR
No specific
1
MAT - PROTECTIVE
636-1100-3GSE
1
INLET COWL PROTECT COVER
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.P05-038)
cheesecloth - bleached, new, woven, unsized
(Material No.P05-060)
demineralized water
(Material No.P05-126)
Brush, short bristle nylon
(Material No.P05-421)
Scrub Pad
(Material No.P05-492)
epoxy
(Material No.P05-493B)
pressure sensitive, non-silicone adhesive
(Material No.P11-065)
Acetone
(Material No.P18-018)
primer, epoxy, corrosion inhibiting
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
400
POWER PLANT, NACELLES AND PYLONS
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 70-27-00-910-810-A
PWA 83 - Cleaning of Parts Before Adhesive Bonding, Sealing or Filling
TASK 71-00-00-860-833-A
Procedure to Prevent Engine Motoring
TASK 72-11-03-000-801-A
Removal of the Fan Blades
TASK 72-11-03-400-801-A
Installation of the Fan Blades
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly
3. Job Set-up
Subtask 72-11-03-941-062-A ** ON A/C NOT FOR ALL
A. Safety Precautions
   (1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
   (2) Put the 636-1100-3GSE INLET COWL PROTECT COVER or equivalent and the MAT - PROTECTIVE on the engine intake cowl and fan case to protect the inner surfaces.
4. Procedure
Subtask 72-11-03-350-051-A ** ON A/C NOT FOR ALL
A. Do an Erosion Coat Touch-Up Repair of the Fan Blade Assembly
CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
   (1) Remove the fan blade, if necessary (Ref. AMM TASK 72-11-03-000-801).
   (2) Examine the damaged fan blade erosion coat surfaces.
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
and Table 601
NOTE: Area A extends 0.5 in. (12.7 mm) from the top of the platform along the blade and 0.5 in. (12.7 mm) from the side of the blade along the platform.
   (3) Remove all loose or unbonded black erosion coat with a BLADE - RAZOR, KNIFE- RAZOR or other equivalent cutting tool.
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
   (4) Clean the repair area(s) as follows:
     (a) Wipe the repair area(s) outboard with an P05-038cheesecloth - bleached, new, woven, unsized and Acetone (Material No.P11-065) .
     (b) Make the repair and adjacent area(s) rough with a Scrub Pad (Material No.P05-421) and Acetone (Material No.P11-065) .
     (c) Wipe the repair area(s) outboard with an P05-038cheesecloth - bleached, new, woven, unsized and Acetone (Material No.P11-065) .
     (d) Make the repair and adjacent area(s) rough with a Scrub Pad (Material No.P05-421) and Acetone (Material No.P11-065) .
     (e) Wipe the repair area(s) outboard with an P05-038cheesecloth - bleached, new, woven, unsized and Acetone (Material No.P11-065) .
     (f) Wait for five minutes for the Acetone (Material No.P11-065) to dry.
     (g) Examine the repair area(s) again to make sure that the repair(s) is (are) still in the approved limits. Refer to Table 601.
   (5) Do a visual inspection of the repair area(s) as follows.
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
and
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
     (a) Make sure that all loose or unbonded erosion coat is removed.
     (b) Make sure that there are no nicks, scratches or damage to the fan blade parent material.
     (c) Make sure that there is no pitting on the fan blade parent material.
     (d) Make sure that there is no damaged, loose or missing epoxy filler compound at the seam between the fan blade and fan blade cover and/or behind the Leading Edge (LE) sheath.
   (6) Clean the repair area(s) by PWA 83-A4 with Acetone (Material No.P11-065) (Ref. AMM TASK 70-27-00-910-810).
   (7) Make a template of the repair area(s)
CAUTION: DO NOT APPLY A COAT OF EPOXY PRIMER TO THE LEADING EDGE SHEATH. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE PART CAN OCCUR.
     (a) Make a template of the repair area(s) with P05-493Bpressure sensitive, non-silicone adhesive. Keep a minimum distance of 0.125 in. (3.175 mm) from the damage edge. For repairs adjacent to the LE, put P05-493Bpressure sensitive, non-silicone adhesive on the titanium LE sheath.
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
   (8) Mix the P18-018primer, epoxy, corrosion inhibiting by the manufacturer's instructions. Acetone (Material No.P11-065) can be used as an alternative for demineralized water (Material No.P05-060) to mix the P18-018primer, epoxy, corrosion inhibiting, if necessary.
NOTE: The mixture quantity will be different if Acetone (Material No.P11-065) is used as an alternative to demineralized water (Material No.P05-060) .
   (9) Apply a single coat of P05-126Brush, short bristle nylon with a new No. 4 P05-126Brush, short bristle nylon.
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
and
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
NOTE: P18-018primer, epoxy, corrosion inhibiting is not permitted on the adjacent black erosion coat surface.
   (10) Let the P18-018primer, epoxy, corrosion inhibiting dry at room temperature and then remove the P05-493Bpressure sensitive, non-silicone adhesive.
   (11) Cure the P18-018primer, epoxy, corrosion inhibiting by one of the steps that follow:
     (a) Cure at 130 deg.F (54 deg.C) to 170 deg.F (77 deg.C) for 30 minutes minimum.
     (b) Cure at 60 deg.F (16 deg.C) to 90 deg.F (32 deg.C) for six hours minimum.
   (12) Keep the repair area(s) free from contamination until the epoxy (Material No.P05-492) is applied.
   (13) Wipe all repair surfaces with an P05-038cheesecloth - bleached, new, woven, unsized and Acetone (Material No.P11-065) as follows:
     (a) Wipe the repair area outboard to prevent contamination into the area.
     (b) Wait for five minutes for the Acetone (Material No.P11-065) to dry.
   (14) Clean the repair area(s) by PWA 83-A4 with Acetone (Material No.P11-065) before you apply (Ref. AMM TASK 70-27-00-910-810) P05-493Bpressure sensitive, non-silicone adhesive.
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
   (15) Make a template of the repair area(s) with P05-493Bpressure sensitive, non-silicone adhesive. Keep a minimum distance of 0.125 in. (3.175 mm) from the damage edge. For repairs adjacent to the LE, put P05-493Bpressure sensitive, non-silicone adhesive on the titanium LE sheath.
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
   (16) Mix the epoxy (Material No.P05-492) by the manufacturer's instructions.
   (17) Apply the epoxy (Material No.P05-492) with a new No. 4 P05-126Brush, short bristle nylon in a crosshatch pattern as follows.
F Erosion Coat Touch-Up Repair of the Fan Blade Assembly ** ON A/C NOT FOR ALL
     (a) Apply epoxy (Material No.P05-492) of not more than 0.125 in. (3.175 mm) onto the adjacent polyurethane coat.
     (b) Apply epoxy (Material No.P05-492) the to a thickness equal to the height of the adjacent black erosion coat.
NOTE: Thickness differences of the epoxy (Material No.P05-492) are permitted not more than 50 percent.
   (18) Let the epoxy (Material No.P05-492) air-dry for 15 minutes and then remove P05-493Bpressure sensitive, non-silicone adhesive.
   (19) Make the surface edge epoxy (Material No.P05-492) of the smooth with an applicable P05-126Brush, short bristle nylon of the correct dimension.
   (20) Cure the epoxy (Material No.P05-492) at 150 deg.F (66 deg.C) to 170 deg.F (77 deg.C) for four hours minimum.
   (21) Clean the repair area(s) with a Scrub Pad (Material No.P05-421) and wipe them outboard with an P05-038cheesecloth - bleached, new, woven, unsized and Acetone (Material No.P11-065) .
   (22) Do a visual inspection of the repair area(s). Make sure that there is no lifting or blistering of the epoxy (Material No.P05-492) .
   (23) Make the repair area(s) adjacent to the titanium LE rough. The finished epoxy (Material No.P05-492) must be of thickness equal to the adjacent LE sheath.
   (24) Install the fan blade if it was removed (Ref. AMM TASK 72-11-03-400-801).

Table 601: Coat Area Repairable Limits
EXAMINE
DAMAGE
DISPOSITION
1.Blade polyurethane coat flowpath surfaces for:


A.Areas A and C
Localized missing or unbonded erosion coat
Not repairable by this repair.
B.Area B
Localized missing or unbonded erosion coat:
Concave side: Total of five areas maximum. One area 1.0 in.2 (645.16 mm2) maximum, and four areas 0.250 in.2 (161.29 mm2) maximum, separated by 0.250 in. (6.35 mm) minimum.
Convex side: Total of four areas 0.250 in.2 (161.29 mm2) maximum separated by 0.250 in. (6.35 mm) minimum.
Go to repair.
5. Close-up
Subtask 72-11-03-942-056-A ** ON A/C NOT FOR ALL
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 636-1100-3GSE INLET COWL PROTECT COVER and the MAT - PROTECTIVE from the engine intake cowl and fan case.
   (3) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.04.01 02:48:06 UTC
"Aviabrain" 2025