DOC AIRBUS | AMM A320FBlending of the Metal Leading Edge Fan Blades [CFML]
TASK 72-21-20-320-801-A
Blending of the Metal Leading Edge Fan Blades
This procedure gives instructions to blend the nose of the fan blade metal leading edge.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 72-21-20-941-057-A
Subtask 72-21-20-220-050-A
Table 801 - Dimensional Information
Subtask 72-21-20-110-051-A
Subtask 72-21-20-942-053-A
[Rev.10 from 2021]
2026.04.01 02:51:41 UTC
Blending of the Metal Leading Edge Fan Blades
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 400
1. Reason for the JobThis procedure gives instructions to blend the nose of the fan blade metal leading edge.
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 | MAT - PROTECTIVE |
| No specific | AR | WARNING NOTICE(S) |
| No specific | AR | WATER - DISTILLED |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP1041) | isopropyl alcohol |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 72-21-20-210-802-A | Visual Inspection of the Fan Blade |
Fan BladeSubtask 72-21-20-941-057-A
A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put the WARNING NOTICE(S) in position to tell persons not to operate:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
(3) Put the ACCESS PLATFORM 1M(3 FT) in position.
(4) Install the MAT - PROTECTIVE in the lower half of the inlet cowl.
4. Procedure(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put the WARNING NOTICE(S) in position to tell persons not to operate:
- The ENG/MODE selector switch
- The ENG/MASTER 1(2) control switch.
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
(3) Put the ACCESS PLATFORM 1M(3 FT) in position.
(4) Install the MAT - PROTECTIVE in the lower half of the inlet cowl.
Subtask 72-21-20-220-050-A
WARNING:
REFER TO THE PRODUCT LABEL AND THE MANUFACTURER'S (MATERIAL) SAFETY DATA SHEET (SDS) FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING AND CORRECT USE OF CONSUMABLE PRODUCTS.
A. Dimensional Information NOTE: Dimensions are in millimeters with inches in parentheses.
Table 801 - Dimensional Information
| Description | Minimum In-Process Dimension | Maximum In-Process Dimension | Minimum Finish Dimension | Maximum Finish Dimension | Reference Dimension |
|---|---|---|---|---|---|
| Radius R1 (All Areas) | - | - | 20 x Dim P | - | - |
| Radius R2 (All Areas) | - | - | 5 mm (0.20 in.) | 8 mm (0.31 in.) | - |
| Dim P (Area C) | - | - | - | 1 mm (0.04 in.) | - |
| Dim P (Area B) | - | - | - | 0.8 mm (0.031 in.) | - |
| Dim P (Area D) | - | - | - | 3 mm (0.12 in.) | - |
| Dim P (Areas E and F) | - | - | - | 4 mm (0.16 in.) | - |
| Dim N (Area F) | | | 2 x Dim P | | |
| Metal leading edge cumulative length of blend repair for each blade | - | - | - | 196 mm (7.72 in.) | - |
| Metal leading edge cumulative length of blend repair for each engine | - | - | - | 954 mm (37.56 in.) | - |
B. If necessary, clean the area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with isopropyl alcohol (Material No.CP1041) or WATER - DISTILLED, SPM 702111 .
Subtask 72-21-20-220-056-A C. Make sure that you can do the repair with the cumulated limits below. If one of the measured cumulated length is not in the limits, you cannot repair the blade with this procedure:
(1) For each blade the maximum cumulative length is 196 mm (7.7165 in.).
(2) For each engine the maximum cumulative length is 954 mm (37.5591 in.).
Subtask 72-21-20-320-050-A (1) For each blade the maximum cumulative length is 196 mm (7.7165 in.).
(2) For each engine the maximum cumulative length is 954 mm (37.5591 in.).
D. Blending Procedures
SPM 704111 and to the following instructions:
(a) If two blendings overlap, blend out the bottom of the two repairs tangentially.
(b) (2) Alternative procedure. Do a power blending of the metal leading edge nose as follows:
(a) Start with carbide milling tool (PFERD ZYA 0413 / 6SZ3P). Refer to Table 801,SPM 704112 and to the following instructions:
(b) If two blendings overlap, blend out the bottom of the two repairs tangentially.
(c) (d) Finish with a silicon carbide abrasive paper (grade P220) for a minimum of 0.1 mm (0.004 in.) depth,SPM 704112 . Refer to Table 801.
(3) Make sure that the contour of the metal leading edge nose after blending is correct.
(4) Make sure that the blending is on the limits. Refer to Table 801.
Subtask 72-21-20-110-052-A WARNING:
DO NOT LET TITANIUM DUST COLLECT. DISCARD ALL TITANIUM WASTE IN AN APPROVED CONTAINER. TITANIUM DUST IS EXTREMELY FLAMMABLE.
WARNING:
DO NOT USE WATER TO EXTINGUISH A TITANIUM FIRE. EXTINGUISH WITH AN APPROVED CHEMICAL FOR METAL FIRES.
WARNING:
DO NOT USE HALOGEN PRODUCTS. TITANIUM ALLOY PARTS REACT TO CHLORINATED HYDROCARBONS. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY TO PERSONS CAN OCCUR.
CAUTION:
DO NOT USE TOOLS THAT WERE USED ON OTHER MATERIALS. IT WILL CAUSE CONTAMINATION OF THE TITANIUM. KEEP THE BLENDING ABRASIVE TOOLS USED FOR TITANIUM SEPARATE FROM TOOLS USED FOR OTHER METALS. IF YOU ARE NOT SURE OF THE PREVIOUS USE OF THE ABRASIVE TOOL, DISCARD IT AND USE A NEW ABRASIVE TOOL.
CAUTION:
DO NOT LET THE METAL LEADING EDGE BECOME TOO HOT DURING THE BLENDING OPERATION. IF IT BECOMES TOO HOT, DAMAGE TO THE BOND JOINT ADHESIVE AND COMPOSITE MATERIAL CAN OCCUR.
(1) Alternative procedure available. Do a hand blending of the metal leading edge nose. Refer to Table 801, (a) If two blendings overlap, blend out the bottom of the two repairs tangentially.
(b) (2) Alternative procedure. Do a power blending of the metal leading edge nose as follows:
(a) Start with carbide milling tool (PFERD ZYA 0413 / 6SZ3P). Refer to Table 801,
(b) If two blendings overlap, blend out the bottom of the two repairs tangentially.
(c) (d) Finish with a silicon carbide abrasive paper (grade P220) for a minimum of 0.1 mm (0.004 in.) depth,
(3) Make sure that the contour of the metal leading edge nose after blending is correct.
(4) Make sure that the blending is on the limits. Refer to Table 801.
E. Clean the repaired area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with isopropyl alcohol (Material No.CP1041) or WATER - DISTILLED, SPM 702111 .
Subtask 72-21-20-230-050-A F. Do the Fluorescent Penetrant Inspection (FPI) as follows:
(2) Alternative procedure available. If you do the hand blending at the Para. 4.D. before, do as follows:
(a) Do the local swab etching of the repaired areas,SPM 705311 .
(b) Do the FPI of the repaired area,SPM 703223 .
(c) For the acceptance criteria, refer to Para. 4.G.
(3) Alternative procedure. If you do the hand blending at the Para. 4.D. before, do as follows:
(a) Do the FPI of the repaired areas,SPM 703214 .
(b) For the acceptance criteria, refer to Para. 4.G.
(4) If you do the power blending at the Para. 4.D. before, do as follows:
(a) Do the local swab etching of the repaired areas,SPM 705311 .
(b) Do the FPI of the repaired areas,SPM 703223 .
(c) For the acceptance criteria, refer to Para. 4.G.
Subtask 72-21-20-230-052-A CAUTION:
DO NOT SPRAY FLUORESCENT-PENETRANT INSPECTION PRODUCTS ON THE COMPOUND MATERIAL. IF YOU DO, DAMAGE TO THE PART WILL OCCUR.
(1) If necessary, apply mask on the composite area. (2) Alternative procedure available. If you do the hand blending at the Para. 4.D. before, do as follows:
(a) Do the local swab etching of the repaired areas,
(b) Do the FPI of the repaired area,
(c) For the acceptance criteria, refer to Para. 4.G.
(3) Alternative procedure. If you do the hand blending at the Para. 4.D. before, do as follows:
(a) Do the FPI of the repaired areas,
(b) For the acceptance criteria, refer to Para. 4.G.
(4) If you do the power blending at the Para. 4.D. before, do as follows:
(a) Do the local swab etching of the repaired areas,
(b) Do the FPI of the repaired areas,
(c) For the acceptance criteria, refer to Para. 4.G.
G. The FPI acceptance criteria are the following:
(1) Cracks are not permitted.
(2) Indications more than 0.3 mm (0.012 in.) are not permitted.
(3) Indications less than or equal to 0.3 mm (0.012 in.) are permitted.
Subtask 72-21-20-110-053-A (1) Cracks are not permitted.
(2) Indications more than 0.3 mm (0.012 in.) are not permitted.
(3) Indications less than or equal to 0.3 mm (0.012 in.) are permitted.
H. Clean the repaired area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with isopropyl alcohol (Material No.CP1041) or WATER - DISTILLED, SPM 702111 .
Subtask 72-21-20-280-050-A I. If the blending depth is equal or more than 0.05 mm (0.0020 in.), do a tap inspection of the bond joints between the metal leading edge sidewalls and the composite part of the fan blade as follows:
(1) If necessary, make the aluminum mallet.
(2) Do a tap test of the surface of the metal leading edge sidewalls (Ref. AMM TASK 72-21-20-210-802) as follows:
(a) Tap for a distance of 150 mm (5.91 in.) above and below the repaired area.
(b) Acceptance criteria: Refer to (Ref. AMM TASK 72-21-20-210-802).
Subtask 72-21-20-280-051-A (1) If necessary, make the aluminum mallet.
(2) Do a tap test of the surface of the metal leading edge sidewalls (Ref. AMM TASK 72-21-20-210-802) as follows:
(a) Tap for a distance of 150 mm (5.91 in.) above and below the repaired area.
(b) Acceptance criteria: Refer to (Ref. AMM TASK 72-21-20-210-802).
J. If the engine or the blade is in shop, do the steps which follows:
(1) Measure and compare the static moment-weight of the fan blade with following criteria:
(a) Minimum radial moment-weight: 298 498 cm.g
(b) Maximum radial moment-weight: 308 625 cm.g.
(2) Write the new moment-weight value.
5. Close-up(1) Measure and compare the static moment-weight of the fan blade with following criteria:
(a) Minimum radial moment-weight: 298 498 cm.g
(b) Maximum radial moment-weight: 308 625 cm.g.
(2) Write the new moment-weight value.
Subtask 72-21-20-942-053-A
A. Put the aircraft back to its initial configuration.
(1) Remove the MAT - PROTECTIVE.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
(1) Remove the MAT - PROTECTIVE.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).