DOC AIRBUS | AMM A320FLeading and Trailing Edges Low Pressure Turbine (LPT) Blades Boro-Blending (Stage 3 to 7) [CFML]
TASK 72-58-00-300-801-A
Leading and Trailing Edges Low Pressure Turbine (LPT) Blades Boro-Blending (Stage 3 to 7)
This repair procedure gives instructions to repair the leading and trailing edges of the Low Pressure Turbine (LPT) blades stage 3 to 6, the leading edge of the stage 7 by boroblending and the trailing edge of the stage 7 by blending.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 72-58-00-941-051-A
Table 802: Tools
(1) Position the drive shaft head (2) to the 90 degree position.
(2) Install the tool onto the drive shaft head (2).
(3) Tighten the lockscrew.
(4) Switch ON the light source to the blending tool.
(5) Position the tool in the 0 degree position and put the shaft (4) into the borescope port.
(6) Monitor the tool and position the drive shaft head (2) to the 90 degree position.
Subtask 72-58-00-080-050-A
Subtask 72-58-00-320-050-A
Subtask 72-58-00-942-050-A
[Rev.10 from 2021]
2026.04.01 02:53:57 UTC
Leading and Trailing Edges Low Pressure Turbine (LPT) Blades Boro-Blending (Stage 3 to 7)
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:
BEFORE YOU USE TOOL 956A7605 G01, CONTACT SAFRAN AIRCRAFT ENGINE DEPARTMENT TO THE ADDRESS GIVEN BELOW. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
NOTE: SAFRAN AIRCRAFT ENGINES TRAINING DEPARTEMENT - Etablissement de Melun Montereau - Aérodrome de Villaroche - B.P 1936 - 77019 Melun Cedex - FRANCE
1. Reason for the JobThis repair procedure gives instructions to repair the leading and trailing edges of the Low Pressure Turbine (LPT) blades stage 3 to 6, the leading edge of the stage 7 by boroblending and the trailing edge of the stage 7 by blending.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
| 400 | POWER PLANT, NACELLES AND PYLONS |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 72-00-00-290-812-A | Engine Borescope Examination Preparation |
Blade Borescope Blending ToolSubtask 72-58-00-941-051-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 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 a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 72-58-00-220-050-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 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 a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
B. Dimensional Information.
Table 801: Dimensional Information
Subtask 72-58-00-020-050-A Subtask 72-58-00-480-050-A Table 801: Dimensional Information
| Description | Minimum In-Process Dimension | Maximum In-Process Dimension | Minimum Finish Dimension | Maximum Finish Dimension | Reference Dimension |
|---|---|---|---|---|---|
| Stage 3 | - | - | - | - | - |
| Dim. D | - | - | 2x the blending depth (Dim. Q or Dim. R) | - | - |
| Dim. G | - | - | 7.5 x Dim.Q | - | - |
| Dim. H | - | - | 5 x Dim.R | - | - |
| L1 + L2 | - | - | - | 0.39 in. (10 mm) | - |
| L3 + L4 | - | - | - | 0.47 in. (12 mm) | - |
| Dim. M | - | - | - | 0.39 in. (10 mm) | - |
| Dim. N | - | - | - | 0.39 in. (10 mm) | - |
| Dim. Q | - | - | - | 0.04 in. (1 mm) | - |
| Dim. R | - | - | - | 0.0492 in. (1.25 mm) | - |
| Dim. S | - | - | - | 1.77 in. (45 mm) | - |
| Radius A | - | - | - | 0.079 in. (2 mm) | - |
| Radius B | - | - | - | 0.02 in. (0.5 mm) | - |
| Stage 4 to 6 | - | - | - | - | - |
| Dim. D | - | - | 2x the blending depth (Dim. Q or Dim. R) | - | - |
| Dim. G | - | - | 5 x Dim.Q | - | - |
| Dim. H | - | - | 5 x Dim.R | - | - |
| L1 + L2 | - | - | - | 0.39 in. (10 mm) | - |
| L3 + L4 | - | - | - | 0.47 in. (12 mm) | - |
| Dim. M | - | - | - | 0.39 in. (10 mm) | - |
| Dim. N | - | - | - | 0.39 in. (10 mm) | - |
| Dim. Q | - | - | - | 0.0492 in. (1.25 mm) | - |
| Dim. R | - | - | - | 0.0492 in. (1.25 mm) | - |
| Radius A | - | - | - | 0.079 in. (2 mm) | - |
| Radius B | - | - | - | 0.02 in. (0.5 mm) | - |
| Stage 7 | - | - | - | - | - |
| Dim. D | - | - | 2x the blending depth (Dim. Q or Dim. R) | - | - |
| Dim. G | - | - | 7,5 x Dim.Q | - | - |
| Dim. H | - | - | 7,5 x Dim.R | - | - |
| L1 + L2 | - | - | - | 0.39 in. (10 mm) | - |
| L3 + L4 | - | - | - | 0.47 in. (12 mm) | - |
| Dim. M | - | - | - | 0.39 in. (10 mm) | - |
| Dim. N | - | - | - | 0.98 in. (25 mm) | - |
| Dim. Q | - | - | - | 0.03 in. (1 mm) | - |
| Dim. R | - | - | - | 0.03 in. (1 mm) | - |
| Radius A | - | - | - | 0.079 in. (2 mm) | - |
| Radius B | - | - | - | 0.02 in. (0.5 mm) | - |
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.
CAUTION:
MAKE SURE THAT THE BELT IS CORRECTLY INSTALLED IN THE TOOL. THE BLADE OF THE GRINDING TOOL MUST TURN CLOCKWISE, AFT LOOKING FORWARD. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.
D. Installation of the tool Table 802: Tools
| Name | Tool Number | Reference | Quantity |
|---|---|---|---|
| HPC AND LPT BLADES IN SITU FPI SET | 956A7605G01 | LEAP-00-AG-20-00 -00A-066A-D | 1 |
| BLADE BORESCOPE BLENDING TOOL KIT | 9474M44P01 | Not Applicable | 1 |
| LPT BLADE BLENDING SCOPE KIT | Wolf tool (5.00101.123) | Not Applicable | 1 |
(2) Install the tool onto the drive shaft head (2).
(3) Tighten the lockscrew.
(4) Switch ON the light source to the blending tool.
(5) Position the tool in the 0 degree position and put the shaft (4) into the borescope port.
(6) Monitor the tool and position the drive shaft head (2) to the 90 degree position.
E. Removal of the tool
(2) Switch OFF the light source to the blending tool.
(3) Put the drive shaft head (2) at the 90 degree position.
(4) Loosen the lockscrew and remove the tool from the drive shaft head (2).
Subtask 72-58-00-420-050-A 4. ProcedureCAUTION:
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.
(1) Put the drive shaft head (2) at the 0 degree position and remove the shaft (4) from the borescope port. (2) Switch OFF the light source to the blending tool.
(3) Put the drive shaft head (2) at the 90 degree position.
(4) Loosen the lockscrew and remove the tool from the drive shaft head (2).
Subtask 72-58-00-320-050-A
A. Boro-blend the LPT blades stage 3 to 6 and the leading edge of stage 7
(1) Do a borescope inspection as follows:
(a) Turn the fan rotor clockwise (aft looking forward).
(b) Identify the first blade you inspect to make sure to inspect all the blades.
(c) Find and measure the area to repair.
1 If needed, do a fluorescent penetrant inspection (S4) of the blade to repair. Refer to Non-Destructive Test (NDT) manual part 08.
2 Write down the inspection results: size and location for each blade.
3 Make sure that the recorded inspection results are in the permitted blending limits. Refer to the Para. 3.C.
4 If the recorded inspection results are less than permitted limits, find the length of the blend necessary to keep the minimum blend radius. Refer to the Para. 3.C.
5 Calculate the minimum blend radius.
(2) Do the boro-blending.
(c) Align the blending tool tip with the area to be blended and check for correct movement across the total length of the area.
(d) With the drive motor (5) off, apply pressure to the grind tool at the area to repair to practice the movement to use to blend the area to repair.
(e) After sufficient practice with the grinding tip (1) on the blade leading edge surface, turn the motor using the on/off switch (3) and use the motor speed control (6) to increase the speed.
(g) Stop the drive motor (5).
(h) Remove the grinding tool. Refer to the Para. 3.E.
(3) Do a polishing of the blade.
(a) Install the polishing tool. Refer to the Para. 3.D.
(b) Put the ON/OFF switch (3) to ON to start the drive motor (5).
(c) Polish the blended surface.
(d) Stop the drive motor (5).
(e) Remove the polishing tool. Refer to the Para. 3.E.
(4) Do a borescope inspection of blended areas.
(a) Use the borescope kit referenced in the table 802.
(b) Make sure that all the areas to repair are blended.
Subtask 72-58-00-280-051-A (1) Do a borescope inspection as follows:
(a) Turn the fan rotor clockwise (aft looking forward).
(b) Identify the first blade you inspect to make sure to inspect all the blades.
(c) Find and measure the area to repair.
1 If needed, do a fluorescent penetrant inspection (S4) of the blade to repair. Refer to Non-Destructive Test (NDT) manual part 08.
2 Write down the inspection results: size and location for each blade.
3 Make sure that the recorded inspection results are in the permitted blending limits. Refer to the Para. 3.C.
4 If the recorded inspection results are less than permitted limits, find the length of the blend necessary to keep the minimum blend radius. Refer to the Para. 3.C.
5 Calculate the minimum blend radius.
(2) Do the boro-blending.
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.
CAUTION:
MAKE SURE THAT YOU DO NOT REPAIR MORE THAN TEN PER CENT OF THE LPT BLADES (14 BLADES) FOR EACH STAGE. IF YOU DO, DAMAGE TO THE EQUIPMENT CAN OCCUR.
(a) Install the grinding tool. Refer to the Para 3.D. NOTE: You must use the shorter blending tool tips for the forward stages and the longer blending tool tips for the aft stages.
NOTE: Make sure that your tool turns in clockwise direction.
(b) Put the grinding tip (1) close to the area to repair. (c) Align the blending tool tip with the area to be blended and check for correct movement across the total length of the area.
(d) With the drive motor (5) off, apply pressure to the grind tool at the area to repair to practice the movement to use to blend the area to repair.
(e) After sufficient practice with the grinding tip (1) on the blade leading edge surface, turn the motor using the on/off switch (3) and use the motor speed control (6) to increase the speed.
NOTE: If the grinding tip (1) does not turn freely, you must apply less pressure to the blade edge surface.
(f) Blending of the area CAUTION:
DO NOT APPLY TOO MUCH PRESSURE. THIS WILL PREVENT VIBRATION AND UNSCREWING OF THE GRINDING TOOL.
1 Blend the area without too much pressure. If necessary screw the grinding tool again. (g) Stop the drive motor (5).
(h) Remove the grinding tool. Refer to the Para. 3.E.
(3) Do a polishing of the blade.
(a) Install the polishing tool. Refer to the Para. 3.D.
(b) Put the ON/OFF switch (3) to ON to start the drive motor (5).
(c) Polish the blended surface.
(d) Stop the drive motor (5).
(e) Remove the polishing tool. Refer to the Para. 3.E.
(4) Do a borescope inspection of blended areas.
(a) Use the borescope kit referenced in the table 802.
(b) Make sure that all the areas to repair are blended.
B. Fluorescent Penetrant Inspection.
(1) Do the fluorescent penetrant inspection (S4) of the blade you repaired. Refer to NDT manual part 08.
(a) No cracks permitted.
Subtask 72-58-00-230-050-A (1) Do the fluorescent penetrant inspection (S4) of the blade you repaired. Refer to NDT manual part 08.
(a) No cracks permitted.
C. Inspect the trailing edges of the LPT blades stage 7 (Alternative procedure available).
(1) Turn the fan rotor clockwise (aft looking forward).
(2) Identify the first blade you inspect to make sure to inspect all the blades.
(3) Find and measure the area to repair.
(a) If needed, do a fluorescent penetrant inspection of the blade to repairSPM 703213 .
(b) Write down the results of the inspection: size and location for each blade.
(c) Make sure that the recorded inspection results are in the permitted blending limits.
(d) If the recorded inspection results are less than permitted limits, find the length of the blend necessary to keep the minimum blend radius.
(e) Calculate the minimum blend radius.
Subtask 72-58-00-230-051-A (1) Turn the fan rotor clockwise (aft looking forward).
(2) Identify the first blade you inspect to make sure to inspect all the blades.
(3) Find and measure the area to repair.
(a) If needed, do a fluorescent penetrant inspection of the blade to repair
(b) Write down the results of the inspection: size and location for each blade.
(c) Make sure that the recorded inspection results are in the permitted blending limits.
(d) If the recorded inspection results are less than permitted limits, find the length of the blend necessary to keep the minimum blend radius.
(e) Calculate the minimum blend radius.
D. Inspect the trailing edges of the LPT blades stage 7 (Alternative procedure).
(1) Turn the fan rotor clockwise (aft looking forward).
(2) Identify the first blade you inspect to make sure to inspect all the blades.
(3) Find and measure the area to repair.
(a) If needed, do a fluorescent penetrant inspection of the blade to repairSPM 703223 .
(b) Write down the results of the inspection: size and location for each blade.
(c) Make sure that the recorded inspection results are in the permitted blending limits.
(d) If the recorded inspection results are less than permitted limits, find the length of the blend necessary to keep the minimum blend radius.
(e) Calculate the minimum blend radius.
Subtask 72-58-00-350-052-A (1) Turn the fan rotor clockwise (aft looking forward).
(2) Identify the first blade you inspect to make sure to inspect all the blades.
(3) Find and measure the area to repair.
(a) If needed, do a fluorescent penetrant inspection of the blade to repair
(b) Write down the results of the inspection: size and location for each blade.
(c) Make sure that the recorded inspection results are in the permitted blending limits.
(d) If the recorded inspection results are less than permitted limits, find the length of the blend necessary to keep the minimum blend radius.
(e) Calculate the minimum blend radius.
E. Blending of the trailing edges of LPT blades stage 7 (Alternative procedure available).
SPM 704111 .
(2) Do an inspection of blended areas. Make sure that all the areas to repair are blended.
Subtask 72-58-00-350-053-A CAUTION:
MAKE SURE THAT YOU DO NOT REPAIR MORE THAN TEN PER CENT OF THE LPT BLADES (14 BLADES) FOR EACH STAGE. IF YOU DO, DAMAGE TO THE EQUIPMENT CAN OCCUR.
(1) Do the blending (2) Do an inspection of blended areas. Make sure that all the areas to repair are blended.
F. Blending of the trailing edges of LPT blades stage 7 (Alternative procedure).
SPM 704112 .
(2) Do an inspection of blended areas. Make sure that all the areas to repair are blended.
Subtask 72-58-00-230-052-A CAUTION:
MAKE SURE THAT YOU DO NOT REPAIR MORE THAN TEN PER CENT OF THE LPT BLADES (14 BLADES) FOR EACH STAGE. IF YOU DO, DAMAGE TO THE EQUIPMENT CAN OCCUR.
(1) Do the blending (2) Do an inspection of blended areas. Make sure that all the areas to repair are blended.
G. Do the fluorescent penetrant inspection of the repaired areas (Alternative procedure available) SPM 703213 .
(1) No cracks permitted.
Subtask 72-58-00-230-053-A (1) No cracks permitted.
H. Do the fluorescent penetrant inspection of the repaired areas (Alternative procedure) SPM 703223 .
(1) No cracks permitted.
Subtask 72-58-00-420-051-A (1) No cracks permitted.
I. Put the engine back to its usual condition.
(1) Install the borescope plugs. Refer to the Para. 3.F.
5. Close-up(1) Install the borescope plugs. Refer to the Para. 3.F.
Subtask 72-58-00-942-050-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).