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TASK 72-31-45-300-805
1 . Bolthole Repair.
A.This procedure gives instructions to repair the high pressure compressor rotor stage 6-10 spool (spool) by reaming the flange boltholes. Refer to Figure 901.
B.The following maximum repairable limits apply to this repair:
NOTE:
The information below gives maximum repairable limits for the applicable Inspection sections. The paragraphs are numbered the same as the manual Inspection sections.
(4)Visual Inspection.
(i)Do an inspection of the flange boltholes for:
1Nicks, dents, and scratches on the ID of bolthole diameters LT and LU:
Maximum repairable limit:
Any amount in the limits of 0.337 inch (8.55 mm) for diameter LT and 0.4640 inch (11.785 mm) for diameter LU.
2Pits:
Maximum repairable limit:
Any amount in the limits of 0.337 inch (8.55 mm) for diameter LT and 0.4640 inch (11.785 mm) for diameter LU.
3Nicks, dents, and scratches on the 45 degree chamfer:
Maximum repairable limit:
Any amount that can be removed by blending the edges to 0.015-0.035 inch (0.39-0.88 mm) chamfer on the forward and aft flanges.
4Pits on the 45 degree chamfer:
Maximum repairable limit:
Any amount that can be removed by blending the edges to 0.015-0.035 inch (0.39-0.88 mm) chamfer on the forward and aft flanges.
5Fretting, galling, or wear on boltholes:
Maximum repairable limit:
Any amount within the limits of 0.337 inch (8.55 mm) for diameter LT and 0.4640 inch (11.785 mm) for diameter LU.
(8)Bolthole Inspection Procedure.
(b)Measure the boltholes as follows:
1Diameter LT:
Minimum repairable limit:
0.329 inch (8.36 mm).
Maximum repairable limit:
0.337 inch (8.55 mm).
2Diameter LU:
Minimum repairable limit:
0.4560 inch (11.583 mm).
Maximum repairable limit:
0.4640 inch (11.785 mm).
C.The subsequent table gives a list of the part numbers that are applicable to this repair. All part numbers are applicable to all paragraphs unless specified differently.
 
Part Number(s)
 
2357M30G02  
2439M35G01  
2439M35G02  
2445M40G02  
 
2610M90G01  
2628M56G01  
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D.Proprietary/Complex Process Statement.
(1)None.
2 . Tools, Equipment, and Materials.
NOTE:
Repair sources can use equivalent alternatives for tools, equipment, and consumable materials, however, the repair source must demonstrate and document equivalency.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C04-166
Shot, Peening, Conditioned Cut Wire (CCW14 shot)
 
C10-021
Tape, Plastic
 
C10-205
Almen Test Strips (Almen N)
C.Referenced Procedures.
 
ATA No.
Description
 
70-21-00
Chemical Cleaning
 
70-21-03
Cleaning Method No. 3 - Steam Cleaning
 
70-24-00
Etching Procedures for Fluorescent-Penetrant Inspection
 
70-24-01
Swab Etching Procedure
 
70-32-00
Indirect Inspection Methods
 
70-32-03
Spot-Fluorescent-Penetrant Inspection
 
70-42-00
Blending and Removal of High Metal Procedures
 
70-42-01
Polishing Bolthole Surfaces
 
70-42-02
Repair Practices for Hole Rework
 
70-47-01
Shotpeening
 
72-31-45
Cleaning 001
 
72-31-45
Inspection 001
D.Expendable Parts. None.
E.SPD Information.
(1)Locally Manufactured SPD. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-31-45-220-132
A.Refer to Figure 901 for specified dimensions and locations.
NOTE:
The dimensional data identified within this procedure was designed using inches as the base unit of measurement for dimensional values. The conversion to millimeters is rounded to one less decimal digit than inches. For minimum dimensions, converted values are rounded up. For maximum dimensions, converted values are rounded down. To avoid conversion errors, do not re-convert from millimeters to inches.
NOTE:
Reference dimensions do not require inspection.
4 . Setup Information.
Subtask 72-31-45-350-012
A.Set-up the spool for machining/shotpeening. Refer to Figure 903 and as follows:
(1)Set-up the spool for machining/shotpeening the aft rabbet and as follows:
(a)Install the spool in the holding fixture.
(b)Surface A must be flat to 0.001 inch (0.02 mm) or less.
(c)Diameter B must have a runout of 0.001 inch (0.02 mm) or less.
(2)Set-up the spool for machining/shotpeening the forward rabbet and as follows:
(a)Install the spool in the holding fixture.
(b)Surface L must be flat to 0.001 inch (0.02 mm) or less.
(c)Diameter M must have a runout of 0.001 inch (0.02 mm) or less.
5 . Procedure.
Subtask 72-31-45-110-009
A.If necessary, clean the spool. Refer to TASK 72-31-45-100-801 (72-31-45, CLEANING 001).
Subtask 72-31-45-320-005
CAUTION:
MAKE SURE TO REMOVE THE MINIMUM QUANTITY OF PARENT MATERIAL NECESSARY TO REMOVE DEFECTS OR DAMAGE TO THE SPOOL CAN OCCUR.
B.Machine the spool damaged bolthole LT or bolthole LU. Refer to TASK 70-42-02-320-001 (REPAIR PRACTICES FOR HOLE REWORK), Figure 901, and as follows:
NOTE:
Post-finish machining requirements for abrasive flow, honing, or jig grinding are not necessary.
(1)If necessary, set-up the spool for machining the aft rabbet. Refer to Subtask 72-31-45-350-012 (paragraph 4.A.(1)).
(2)If necessary, set-up the spool for machining the forward rabbet. Refer to Subtask 72-31-45-350-012 (paragraph 4.A.(2)).
(3)Ream the spool diameter LT or diameter LU to remove all damage. Make sure that the diameters agree with the finish dimensions.
Subtask 72-31-45-350-013
(4)Blend the chamfer on diameter LT and diameter LU to remove the damage from the spool. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) and as follows:
(a)Blend the edges to 0.015-0.035 inch (0.39-0.88 mm) chamfer on the aft face of the forward flange.
(b)Blend the edges to 0.015-0.035 inch (0.39-0.88 mm) chamfer on the aft face of the aft flange.
WARNING:
USE EYE PROTECTION WHEN YOU POLISH MATERIAL OR PARTS. THE PARTICLES CAN CAUSE AN INJURY TO YOUR EYES. USE IN A WELL-VENTILATED AREA.
(5)Polish the spool boltholes repair areas. Refer to TASK 70-42-01-350-003 (POLISHING BOLTHOLE SURFACES) and as follows:
(a)If necessary, polish the chamfer on the aft flange bolthole to remove the damage as follows:
1Polish to a maximum of 0.002 inch (0.05 mm) in depth to fully remove the damage.
2Make sure that the polishing area is not more than 50 percent of the bolthole.
3Surface finish must be 32 microinches (0.8 micrometer).
(b)Polish the repaired spool boltholes and edges on diameter LU, diameter LT/aft flange bolthole to a surface finish of 32 microinches (0.8 micrometer).
Subtask 72-31-45-110-010
C.Etch the spool repaired areas. Refer to TASK 70-24-00-110-033 (ETCHING PROCEDURES FOR FLUORESCENT-PENETRANT INSPECTION) , TASK 70-24-01-110-034 (SWAB ETCHING PROCEDURE) , and as follows:
(1)Use Class C etchant or Class G etchant.
Subtask 72-31-45-230-003
D.Do an inspection of the spool repair areas. Refer to TASK 70-32-00-200-002 (INDIRECT INSPECTION METHODS), TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION), and as follows:
(1)Use Class G penetrant.
(2)Indications are not permitted.
Subtask 72-31-45-380-003
E.Peen the spool diameter LT, diameter LU/repaired chamfer on the forward and aft flange bolthole. Refer to TASK 70-47-01-380-016 (SHOTPEENING), Figure 904, and as follows:
(1)If necessary, set-up the spool for shotpeening the aft rabbet. Refer to Subtask 72-31-45-350-012 (paragraph 4.A.(1)).
(2)If necessary, set-up the spool for shotpeening the forward rabbet. Refer to Subtask 72-31-45-350-012 (paragraph 4.A.(2)).
(3)Apply C10-021  plastic tape to adjacent areas that you will not peen. Refer to Figure 902.
(4)Use C10-205  Almen N.
(5)Use C04-166  CCW14 shot with an intensity of 0.006-0.012N.
(6)Make sure that you do the intensity verification in a simulative fixture.
(7)Ricochet peening is not permitted.
(8)Remove the plastic tape from the spool.
Subtask 72-31-45-110-011
F.Clean the spool. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING) and TASK 70-21-03-160-001 (CLEANING METHOD NO. 3 - STEAM CLEANING).
Subtask 72-31-45-220-133
G.Do a final dimensional inspection of the spool repaired areas. Refer to TASK 72-31-45-200-807 (72-31-45, INSPECTION 001).
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Figure 901   (Sheet 1 ) High Pressure Compressor Rotor Stage 6-10 Spool
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Figure 901   (Sheet 2 ) High Pressure Compressor Rotor Stage 6-10 Spool
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Figure 901   (Sheet 3 ) High Pressure Compressor Rotor Stage 6-10 Spool
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Figure 902   (Sheet 1 ) High Pressure Compressor Rotor Stage 6-10 Spool - Masking Information
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Figure 902   (Sheet 2 ) High Pressure Compressor Rotor Stage 6-10 Spool - Masking Information
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Figure 903   High Pressure Compressor Rotor Stage 6-10 Spool - Setup Information
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Figure 904   High Pressure Compressor Rotor Stage 6-10 Spool - Shotpeening Information