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TASK 72-58-40-300-806
1 . Blend and Shotpeen Repair of the Area B1 and Area F.
A.This procedure gives instructions to repair the mid fan shaft (shaft) by blending and shotpeening surface defects. 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.
NOTE:
For 72-58-40, Inspection 001, refer to TASK 72-58-40-200-801 (72-58-40, INSPECTION 001) .
(4)Visual Inspection.
(p).A.Do an inspection of the ID surface under the spline (area B1) for:
1Deleted.
2Nicks, dents, or scratches:
Maximum repairable limit:
Any amount that can be removed by blending to a maximum depth of 0.0098 inch (0.25 mm).
3Corrosion pit:
Maximum repairable limit:
Any amount that can be removed by blending to a maximum depth of 0.0098 inch (0.25 mm).
(r)Deleted.
(r).B.Deleted.
(s)Do an inspection of the OD surface (area F) for:
2Nicks and dents on area F but not in area F3:
Maximum repairable limit:
Any amount that can be removed by blending to a maximum depth of 0.0098 inch (0.25 mm).
4Scratches on area F but not in area F3:
Maximum repairable limit:
Any amount that can be removed by blending to a maximum depth of 0.0098 inch (0.25 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)
 
2331M20G02  
2331M20G03  
2332M81G03  
2332M81G04  
 
2332M81G05  
2440M20G05  
2440M91G05  
2440M91G06  
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
 
C10-021
Tape, Plastic
C.Referenced Procedures.
 
ATA No.
Description
 
70-16-00
Marking Practices
 
70-16-08
Dot Peen Marking for Optical Character Recognition
 
70-42-00
Blending and Removal of High Metal Procedures
 
70-47-01
Shotpeening
 
70-47-04
Rotary Flap Peening
 
72-58-00
Storage 001
 
72-58-40
Cleaning 001
 
72-58-40
Inspection 001
 
72-58-40
Repair 002
 
72-58-40
Repair 003
 
72-58-40
Repair 013
D.Expendable Parts. None.
E.SPD Information.
(1)Locally Manufactured SPD. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-58-40-220-095
A.Refer to Figure 901 for specified dimensions and locations.
NOTE:
The dimensional data identified within this procedure was designed using millimeters as the base unit of measurement for dimensional values. The conversion to inches is rounded to two additional decimal digits than millimeters. For minimum dimensions, converted values are rounded up. For maximum dimensions, converted values are rounded down. To avoid conversion errors, do not reconvert from inches to millimeters.
NOTE:
Reference dimensions do not require inspection.
4 . Setup Information.
None.
5 . Procedure.
Subtask 72-58-40-380-010
CAUTION:
IT IS RECOMMENDED THAT YOU COMPLETE THIS PROCEDURE AND APPLY AGAIN THE PROTECTIVE COATING IN LESS THAN 24 HOURS AFTER YOU REMOVED THE PROTECTIVE COATING FOR REPAIR, OR THE SHAFT CAN CORRODE.
A.After you complete this repair procedure, make sure that you apply protective coating to the shaft in less than 24 hours after you remove it. If you cannot apply protective coating in less than 24 hours, apply preservative oil. Refer to TASK 72-58-00-550-801 (72-58-00, STORAGE 001).
Subtask 72-58-40-160-003
B.If necessary, clean the shaft. Refer to TASK 72-58-40-100-801 (72-58-40, CLEANING 001).
Subtask 72-58-40-210-002
C.Do a check of the shaft to find a repair mark R009. Refer to Figure 901 and as follows:
NOTE:
Repair marks show that the shaft was repaired before.
NOTE:
The repair mark R009 can be found adjacent to the part number on surface DE.
(1)If there is a repair mark R009 adjacent to the part number, the part cannot be repaired by this procedure. Remove the shaft from service and contact a GE Representative.
(2)If there is no repair mark adjacent to the part number, refer to Subtask 72-58-40-350-033 (paragraph 5.D.).
Subtask 72-58-40-350-033
CAUTION:
REMOVE ONLY THE MINIMUM QUANTITY OF MATERIAL NECESSARY OR DAMAGE TO THE SHAFT CAN OCCUR.
D.Blend the shaft. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), Figure 901, Figure 902, and as follows:
(1)Blend the shaft to remove damaged or defective material in area B1 and area F (but not in area F3) only.
(2)The width of the blend must be a minimum of 20 times its depth. You must measure the width as the shortest distance across the edge of the blended area.
(3)The maximum blend depth is 0.0098 inch (0.25 mm).
(4)Blending into area B2 is not permitted.
(5)Blending is not permitted on the aft pilot fillet radius.
(6)Blending in area F3 is not permitted.
Subtask 72-58-40-220-096
E.Do an inspection of the shaft blended areas. Refer to TASK 72-58-40-200-801 (72-58-40, INSPECTION 001), Figure 901, Figure 902, and as follows:
(1)Make sure that you removed all defects and that the dimensions of the blended areas agree with the limits of Subtask 72-58-40-350-033 (paragraph 5.D.).
Subtask 72-58-40-240-003
F.Do a magnetic particle inspection of the blended area. Refer to TASK 72-58-40-200-801 (72-58-40, INSPECTION 001).
Subtask 72-58-40-380-011
CAUTION:
DO NOT DWELL ON ONE SPOT ON THE SHAFT FOR AN EXTENDED PERIOD OF TIME. BOWING OF THE SHAFT CAN OCCUR.
G.Alternative Procedure Available. Peen the shaft repair area. Refer to TASK 70-47-01-380-016 (SHOTPEENING), Figure 901, and as follows:
(1)Apply C10-021  plastic tape to the inner and outer threads, thermal spray coating, and adjacent surfaces that you will not peen.
(2)Overspray on the adjacent area is permitted, if peening is permitted on the area.
(3)Peening intensity must decrease gradually in the overspray area and there must be a smooth transition between the peened and non-peened areas.
(4)Use S-170 maximum cast steel shot, with a hardness of 55-65 HRc.
(5)Peening intensity must be 0.010-0.015A.
(6)A minimum coverage of 100 percent is necessary.
(7)Remove the masking from the shaft.
Subtask 72-58-40-380-012
CAUTION:
DO NOT DWELL ON ONE SPOT ON THE SHAFT FOR AN EXTENDED PERIOD OF TIME. BOWING OF THE SHAFT CAN OCCUR.
CAUTION:
DO NOT LET THE FLAPPER ROTATE AGAINST THE SHAFT MORE THAN 10000 RPM. DAMAGE TO THE SHAFT CAN OCCUR.
G.A.Alternative Procedure. Peen the shaft repair area. Refer to TASK 70-47-04-380-019 (ROTARY FLAP PEENING), Figure 901, and as follows:
(1)Apply C10-021  plastic tape to the inner and outer threads, thermal spray coating, and adjacent surfaces that you will not peen.
(2)Peening on the adjacent area is permitted, if peening is permitted on the area.
(3)Peening intensity must decrease gradually in the overspray area and there must be a smooth transition between the peened and non-peened areas.
(4)Peening intensity must be 0.010-0.015A.
(5)Do an intensity verification as follows:
(a)Use a magnetic Almen strip holder.
NOTE:
An intensity conversion will be necessary to use magnetic Almen strip holders. Verification of the rotary flap peening intensity must be done with magnetic Almen strip holder.
(b)Make sure that you do the intensity verification with 0.014-0.021A.
NOTE:
Intensity verification of 0.010-0.015A on regular screw-on type Almen strip holder is equivalent to 0.014-0.021A on magnetic Almen strip holder.
(6)A minimum coverage of 100 percent is necessary.
(7)Remove the masking from the shaft.
Subtask 72-58-40-350-034
H.Put a mark on surface DE of the shaft. Refer to TASK 70-16-00-350-001 (MARKING PRACTICES), TASK 70-16-08-350-001 (DOT PEEN MARKING FOR OPTICAL CHARACTER RECOGNITION), Figure 901, and as follows:
(1)Put a mark of the repair number R009 adjacent to the part number on the shaft. Use the same font size.
(2)Use method 1 or method 2.
Subtask 72-58-40-350-035
I.Complete all the necessary repairs for the shaft.
Subtask 72-58-40-380-013
J.Apply the protective coatings and do a balance inspection of the shaft as follows:
(1)For part numbers 2331M20G02, 2331M20G03, 2332M81G03, and 2332M81G04. Refer to TASK 72-58-40-200-801 (72-58-40, INSPECTION 001), TASK 72-58-40-300-803 (72-58-40, REPAIR 002), and TASK 72-58-40-300-804 (72-58-40, REPAIR 003).
(2)For part numbers 2332M81G05, 2440M20G05, 2440M91G05, and 2440M91G06. Refer to TASK 72-58-40-200-801 (72-58-40, INSPECTION 001), TASK 72-58-40-300-804 (72-58-40, REPAIR 003), and TASK 72-58-40-300-812 (REPAIR 013).
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Figure 901   (Sheet 1 ) Mid Fan Shaft - Inspection/Repair Areas
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Figure 901   (Sheet 2 ) Mid Fan Shaft - Inspection/Repair Areas
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Figure 902   Mid Fan Shaft - Blending Limits