DOC AIRBUS | AMM A320FBoro-Blend Repair of the Booster Blades Airfoils (POST SB 72-0080) [CFML]
TASK 72-21-00-300-807-A
Boro-Blend Repair of the Booster Blades Airfoils (POST SB 72-0080)
To blend the Leading Edge (LE) and Trailing Edge (TE) of the booster blade airfoils for stages 2 and 3 and the LE only of the booster blade airfoils stage 4.
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 72-21-00-941-104-A
(1) Position the drive shaft head (3) to the 90 degree position.
(2) Install the 9471M44P01 BORESCOPE BLEND TOOL on the drive shaft head (3).
(3) Tighten the lockscrew (10).
(4) Switch on the borescope light source (1) to the 9471M44P01 BORESCOPE BLEND TOOL.
(5) Position the 9471M44P01 BORESCOPE BLEND TOOL to 0 degree position and put the polishing ball tip (9) into the borescope port.
(6) Monitor the 9471M44P01 BORESCOPE BLEND TOOL and position the drive shaft head (3) to the 90 degree position.
Subtask 72-21-00-080-055-A
(1) Put the drive shaft head (3) at 0 degree position and remove the polishing ball tip (9) from the borescope port.
(2) Switch off the borescope light source (1) to the 9471M44P01 BORESCOPE BLEND TOOL.
(3) Put the drive shaft head (3) at 90 degree position.
(4) Loosen the lockscrew (10) and remove the 9471M44P01 BORESCOPE BLEND TOOL from the drive shaft head (3).
4. Procedure
Subtask 72-21-00-220-064-A
Subtask 72-21-00-410-082-A
[Rev.10 from 2021]
2026.04.01 02:51:19 UTC
Boro-Blend Repair of the Booster Blades Airfoils (POST SB 72-0080)
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.
CAUTION:
BEFORE YOU USE THE TOOL GIVEN IN THIS TASK, CONTACT SAFRAN AIRCRAFT ENGINES TO GET INFORMATION ABOUT THE APPLICABLE TOOL TRAINING. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.
ZONE: 400
1. Reason for the JobTo blend the Leading Edge (LE) and Trailing Edge (TE) of the booster blade airfoils for stages 2 and 3 and the LE only of the booster blade airfoils stage 4.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | WARNING NOTICE(S) |
| 9471M44P01 | 1 | BORESCOPE BLEND TOOL |
| 956A6629G01 | 1 | SET, ENDOSCOPIC FPI CHEMICALS - BOOSTER, HPC, LPT BLAD |
| 956A6630G01 | 1 | SET, ENDOS. FPI AIR FILTRATION - BOOSTER, HPC, LPT BLA |
| 956A6631G01 | 1 | SET, ENDOSCOPIC FPI COMMON VISION - LP TURBINE BLADES |
| 956A6632G02 | 1 | SET, ENDOSCOPIC FPI CALIBRATION, BOOSTER, HPC, LPT BLA |
| 956A6633G01 | 1 | SET, ENDOSCOPIC FPI - LP COMPRESSOR BLADES |
| 956A7616 | 1 | MAT, PROTECTION - INLET COWL |
| REFERENCE | DESIGNATION |
|---|---|
| abrasive cloth, silicon carbide |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 70-25-00-910-802-A | Fluorescent-Penetrant Inspection-Portable-Water Washable |
| TASK 72-21-00-290-802-A | Borescope Inspection of the Booster Blades and Vanes (PRE SB 72-00-0080) |
| TASK 72-21-00-290-802-A-01 | Borescope Inspection of the Booster Blades and Vanes (POST SB 72-00-0080) |
| TASK 72-21-20-000-801-A | Removal of the Fan Blades |
| TASK 72-21-20-400-801-A | Installation of the Fan Blades |
| SPM 704111350009 | |
| SPM 704112350010 | |
Borescope Blend ToolSubtask 72-21-00-941-104-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).
Subtask 72-21-00-010-080-A (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 and
- 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).
B. Get Access
(1) Put the ACCESS PLATFORM 1M(3 FT) in position.
(2) Install the 956A7616 MAT, PROTECTION - INLET COWL in the inlet cowl.
(3) In case of repair of the booster blade stage 2 LE, remove the fan rotor blades (Ref. AMM TASK 72-21-20-000-801).
Subtask 72-21-00-480-061-A (1) Put the ACCESS PLATFORM 1M(3 FT) in position.
(2) Install the 956A7616 MAT, PROTECTION - INLET COWL in the inlet cowl.
(3) In case of repair of the booster blade stage 2 LE, remove the fan rotor blades (Ref. AMM TASK 72-21-20-000-801).
NOTE: Make sure that you number each blade as you remove it, to make sure each blade is installed in its initial position.
CAUTION:
DO NOT INSTALL OR REMOVE A TOOL TIP FROM THE HEAD WITH BEARING IF IT IS SET IN THE 0-DEGREE POSITION. IF YOU DO, THE DRIVE BELT WILL DISENGAGE.
C. Installation of the Borescope Blend Tool(1) Position the drive shaft head (3) to the 90 degree position.
(2) Install the 9471M44P01 BORESCOPE BLEND TOOL on the drive shaft head (3).
(3) Tighten the lockscrew (10).
(4) Switch on the borescope light source (1) to the 9471M44P01 BORESCOPE BLEND TOOL.
(5) Position the 9471M44P01 BORESCOPE BLEND TOOL to 0 degree position and put the polishing ball tip (9) into the borescope port.
(6) Monitor the 9471M44P01 BORESCOPE BLEND TOOL and position the drive shaft head (3) to the 90 degree position.
CAUTION:
DO NOT INSTALL OR REMOVE A TOOL TIP FROM THE HEAD WITH BEARING IF IT IS SET IN THE 0-DEGREE POSITION. IF YOU DO, THE DRIVE BELT WILL DISENGAGE.
D. Removal of the Borescope Blend Tool (1) Put the drive shaft head (3) at 0 degree position and remove the polishing ball tip (9) from the borescope port.
(2) Switch off the borescope light source (1) to the 9471M44P01 BORESCOPE BLEND TOOL.
(3) Put the drive shaft head (3) at 90 degree position.
(4) Loosen the lockscrew (10) and remove the 9471M44P01 BORESCOPE BLEND TOOL from the drive shaft head (3).
Subtask 72-21-00-220-064-A
A. Dimensional Limits
Subtask 72-21-00-290-056-A | DESCRIPTION | MINIMUM IN-PROCESS DIMENSION | MAXIMUM IN-PROCESS DIMENSION | MINIMUM FINISH DIMENSION | MAXIMUM FINISH DIMENSION | REFERENCE DIMENSION |
|---|---|---|---|---|---|
| A. Definition of critical areas: (Area A) for all stages and (Area N) for stage 3 only | |||||
| Dim. H | - | - | - | - | 24 mm (0.94 in.) |
| Dim. Q | - | - | - | - | 16.6 mm (0.654 in.) |
| Dim. R | - | - | - | - | 35.1 mm (1.382 in.) |
| Dim. F | - | - | - | - | 15.2 mm (0.598 in.) |
| Dim. N | - | - | - | - | 43.0 mm (1.693 in.) |
| Dim. T | - | - | - | - | 49.1 mm (1.933 in.) |
| Dim. Z | - | - | - | - | 1.0 mm (0.039 in.) |
| B. Blending limits of LEs and/or TEs for all stages (Area B) | |||||
| Dim. P | - | - | - | 1.0 mm (0.039 in.) | - |
| Cumulative length of the blend repairs (per blade) | - | - | - | 14 mm (0.55 in.) | - |
| Max. chord reduction due to blending on LE and/or TE (per blade) | - | - | - | 1.0 mm (0.039 in.) | - |
| Dim. K | - | - | - | 10 mm (0.39 in.) | - |
| C. Blend repair proportion on LEs and TEs | |||||
| Dim. L | - | - | 6 x Dim. P | - | - |
| Radius R | - | - | 5 x Dim. P | - | - |
| Radius r | - | - | 2 x Dim. P | - | - |
Table - Dimensional Limits
B. Do a borescope inspection of the Low Pressure Compressor (LPC) blades as follows:
(1) Turn the fan rotor Clockwise (CW) (aft looking forward).
(2) Mark the first blade you inspect to make sure that all the blades are inspected.
(3) Count the number of blades which are already blended:
(a) For each stage, a maximum of five blades can be blended on Area B.
(b) Make sure that these conditions are still respected after the repair.
(4) Find and measure the area to be repaired:
(a) Write down the inspection results: the dimension and the location for each blade.
(b) Make sure that the recorded inspection results are within the permitted blending limits.
(c) (d) Calculate the minimum blend radius at five times the depth of the defect.
Subtask 72-21-00-320-066-A (1) Turn the fan rotor Clockwise (CW) (aft looking forward).
(2) Mark the first blade you inspect to make sure that all the blades are inspected.
(3) Count the number of blades which are already blended:
(a) For each stage, a maximum of five blades can be blended on Area B.
(b) Make sure that these conditions are still respected after the repair.
(4) Find and measure the area to be repaired:
(a) Write down the inspection results: the dimension and the location for each blade.
(b) Make sure that the recorded inspection results are within the permitted blending limits.
(c) (d) Calculate the minimum blend radius at five times the depth of the defect.
C. Boro-blend the TEs of the LPC blades stage 2, the LEs and TEs of LPC blades stage 3 and the LEs of the LPC blades stage 4:
(a) Check for correct movement across the total length of the area.
(6)
(8) (9) Remove the 9471M44P01 BORESCOPE BLEND TOOL. Refer to Para. 3.D.
Subtask 72-21-00-320-067-A CAUTION:
DO NOT BLEND AREA A (ALL STAGES), AREA C (ALL STAGES) AND AREA N (STAGE 3 ONLY). IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO AREAS A, C AND N WILL OCCUR.
CAUTION:
MAKE SURE THAT THE BLEND TIP IS POINTED AWAY FROM THE OPERATOR IN THE 90-DEGREE POSITION. START THE DRIVE MOTOR AND MAKE SURE THAT THE TIP TURNS IN THE CLOCKWISE DIRECTION. IF IT TURNS COUNTERCLOCKWISE, EXAMINE THE DRIVE BELT FOR POSSIBLE TWISTED INSTALLATION.
(1) Install the 9471M44P01 BORESCOPE BLEND TOOL. Refer to Para. 3.C. NOTE: Make sure that the 9471M44P01 BORESCOPE BLEND TOOL turns in CW direction.
(2) (3) Align the 9471M44P01 BORESCOPE BLEND TOOL tip with the area to be blended:(a) Check for correct movement across the total length of the area.
NOTE:
(4) (5) With the drive motor (5) off, apply pressure on the 9471M44P01 BORESCOPE BLEND TOOL at the repair area to practice the movement to blend the repair area.(6)
NOTE:
(7) (a) (b) When you repair, remove a minimum of 0.025 mm (0.0010 in.) of base metal more than depth of the defect.NOTE: Do not blend more than the permitted limits (do not exceed Dim. P).
(c) (d) (e) The maximum chord reduction permitted is Dim. P on LEs or TEs. Refer to the dimensional limits in Table 1. If you do two opposite blending, Dim. P has to be shared.(8) (9) Remove the 9471M44P01 BORESCOPE BLEND TOOL. Refer to Para. 3.D.
D. Blend the LEs of LPC blades stage 2 through the booster inlet:
CP2721 CS333X abrasive cloth, silicon carbide
(2) Alternative procedure SPM 704112350010 (Power blending).
(3) Alternative procedure. Use the 9471M44P01 BORESCOPE BLEND TOOL. Refer to Para. 4.C.
Subtask 72-21-00-320-068-A NOTE: Refer to Para. 4.C.(7) for the blending instructions.
(1) Alternative procedures available. Do a hand blending with strips of (2) Alternative procedure SPM 704112350010 (Power blending).
(3) Alternative procedure. Use the 9471M44P01 BORESCOPE BLEND TOOL. Refer to Para. 4.C.
NOTE: Make sure that you use the 9471M44P01 BORESCOPE BLEND TOOL through the booster inlet and not through a borescope hole.
E. Do a polishing of the blade as given below:
(1) Install the polishing ball tip (9). Refer to Para. 3.C.
(2) Put the ON/OFF switch (6) to ON to start the drive motor (5).
(3) Polish the blended surface.
(4) Stop the drive motor (5).
(5) Remove the polishing ball tip (9). Refer to Para. 3.D.
Subtask 72-21-00-290-057-A (1) Install the polishing ball tip (9). Refer to Para. 3.C.
(2) Put the ON/OFF switch (6) to ON to start the drive motor (5).
(3) Polish the blended surface.
(4) Stop the drive motor (5).
(5) Remove the polishing ball tip (9). Refer to Para. 3.D.
F. Do a borescope inspection of the blended areas (Ref. AMM TASK 72-21-00-290-802):
(1) Use the 9471M44P01 BORESCOPE BLEND TOOL.
(2) Make sure that all the areas to be repaired are blended.
Subtask 72-21-00-230-059-A (1) Use the 9471M44P01 BORESCOPE BLEND TOOL.
(2) Make sure that all the areas to be repaired are blended.
G. Do the Fluorescent Penetrant Inspection (FPI):
(1) Do the FPI (Sensitivity, level 3) of the blade repaired with the 956A6629G01 SET, ENDOSCOPIC FPI CHEMICALS - BOOSTER, HPC, LPT BLAD, 956A6630G01 SET, ENDOS. FPI AIR FILTRATION - BOOSTER, HPC, LPT BLA, 956A6631G01 SET, ENDOSCOPIC FPI COMMON VISION - LP TURBINE BLADES, 956A6632G02 SET, ENDOSCOPIC FPI CALIBRATION, BOOSTER, HPC, LPT BLA and 956A6633G01 SET, ENDOSCOPIC FPI - LP COMPRESSOR BLADES (Ref. AMM TASK 70-25-00-910-802):
5. Close-up(1) Do the FPI (Sensitivity, level 3) of the blade repaired with the 956A6629G01 SET, ENDOSCOPIC FPI CHEMICALS - BOOSTER, HPC, LPT BLAD, 956A6630G01 SET, ENDOS. FPI AIR FILTRATION - BOOSTER, HPC, LPT BLA, 956A6631G01 SET, ENDOSCOPIC FPI COMMON VISION - LP TURBINE BLADES, 956A6632G02 SET, ENDOSCOPIC FPI CALIBRATION, BOOSTER, HPC, LPT BLA and 956A6633G01 SET, ENDOSCOPIC FPI - LP COMPRESSOR BLADES (Ref. AMM TASK 70-25-00-910-802):
NOTE: The tools 956A6629G01, 956A6630G01, 956A6631G01, 956A6632G02 and 956A6633G01 are patented by Safran Aircraft Engine.
(a) Make sure there are no cracks.Subtask 72-21-00-410-082-A
A. Put the engine back to its usual condition:
(1) In case of repair of the booster blade airfoils stage 2, reinstall the fan rotor blades (Ref. AMM TASK 72-21-20-400-801).
Subtask 72-21-00-410-083-A (1) In case of repair of the booster blade airfoils stage 2, reinstall the fan rotor blades (Ref. AMM TASK 72-21-20-400-801).
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the 956A7616 MAT, PROTECTION - INLET COWL.
(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 956A7616 MAT, PROTECTION - INLET COWL.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).