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TASK 72-31-43-300-804
1 . Dovetail Fretting Wear Repair.
A.This procedure gives instructions to repair the HPC rotor stage 3-4 spool (spool) by shotpeening the dovetail pressure faces to remove fretting wear. 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 dovetail for:
5Constant fretting wear on the pressure faces of stages 3-4.
Maximum repairable limits:
Any amount, 0.004 inch (0.10 mm) in depth.
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)
 
2357M34G01  
2439M37G01  
2439M37G02  
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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
 
C04-286
Shot, Peening, Cast Steel (AMS 2431/1 ASR) Cast Steel Shot, Regular Hardness (45-62 HRc) (S110 cast steel shot)
 
C10-021
Tape, plastic
C.Referenced Procedures.
 
ATA No.
Description
 
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
 
70-47-01
Shotpeening
 
72-31-43
Cleaning 001
 
72-31-43
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 72-31-43-220-075
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.
None.
Subtask 72-31-43-350-021
A.Deleted.
5 . Procedure.
Subtask 72-31-43-160-010
A.Clean the dovetail damaged area of the spool. Refer to TASK 72-31-43-100-801 (72-31-43, CLEANING 001).
Subtask 72-31-43-110-012
B.Etch the dovetail damaged areas of the spool. 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 B etchant
Subtask 72-31-43-230-006
C.Do an inspection of the dovetail damaged area of the spool. 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)For the limits, refer to TASK 72-31-43-200-801 (72-31-43, INSPECTION 001).
Subtask 72-31-43-160-011
D.Clean the spool. Refer to TASK 72-31-43-100-801 (72-31-43, CLEANING 001).
Subtask 72-31-43-380-005
E.Peen the dovetail damaged areas of the spool. Refer to TASK 70-47-01-380-016 (SHOTPEENING), Figure 902, and as follows:
Subtask 72-31-43-350-022
(1)Deleted.
Subtask 72-31-43-380-006
(2)Apply C10-021  plastic tape to the spool areas that you will not peen and to each thermal spray coating area.
(3)UseC04-286  S110 cast steel shot.
(4)Intensity must be 0.006-0.012N.
(5)Do an intensity verification in a scrap part fixture.
(6)Ricochet peening is permitted.
(7)Remove the plastic tape from the spool.
Subtask 72-31-43-160-012
F.If necessary, clean the spool. Refer to TASK 72-31-43-100-801 (72-31-43, CLEANING 001).
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Figure 901   (Sheet 1 ) High Pressure Compressor Stage 3-4 Spool
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Figure 901   (Sheet 2 ) High Pressure Compressor Stage 3-4 Spool
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Figure 901   (Sheet 3 ) High Pressure Compressor Stage 3-4 Spool
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Figure 901   (Sheet 4 ) High Pressure Compressor Stage 3-4 Spool
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Figure 902   Intensity Verification Locations