* * * FOR ALL
TASK 72-58-40-300-805
1 . Flange Area Machining Repair.
A.This procedure gives instructions to repair the mid fan shaft (shaft) by machining the flange area to remove 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.
(k)Do an inspection of the mounting flange for:
2Nicks, dents, or scratches:
Maximum repairable limit:
Any amount, if the damage can be removed by machining. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
3Corrosion pit:
Maximum repairable limit:
Any amount, if the damage can be removed by machining. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
4Nicks, dents, or scratches on the flange face:
Maximum repairable limit:
Any amount, if the damage can be removed by machining. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
5Fretting or galling in area Y on the forward flange face:
Maximum repairable limit:
Any amount, if the damage can be removed by machining. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
6Fretting or galling in all other areas on the forward flange face:
Maximum repairable limit:
Any amount, if the damage can be removed by machining. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
7Fretting or galling on the aft flange face:
Maximum repairable limit:
Any amount, if the damage can be removed by machining. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
8Corrosion pit on the flange face:
Maximum repairable limit:
Any amount, if the damage can be removed by machining. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
(m)Do an inspection of the seal air flange for:
2Nicks, dents, and scratches:
Maximum repairable limit:
Any amount, if the damage can be removed by machining. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
3Corrosion pits:
Maximum repairable limit:
Any amount, if the damage can be removed by machining. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
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  
2332M81G01  
2332M81G03  
 
2332M81G04  
2332M81G05  
2440M20G05  
2440M91G05  
 
2440M91G06  
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--
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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. None.
C.Referenced Procedures.
 
ATA No.
Description
 
70-00-03
Machining Data
 
70-16-00
Marking Practices
 
70-16-08
Dot Peen Marking for Optical Character Recognition
 
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
 
70-47-03
Dry Abrasive Blast Surface Finishing
 
72-58-00
Storage 001
 
72-58-40
Cleaning 001
 
72-58-40
Inspection 001
 
72-58-40
Repair 004
D.Expendable Parts. None.
E.SPD Information.
(1)Locally Manufactured SPD. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-58-40-220-089
A.Refer to Figure 901 and Figure 902 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.
 
Description
Minimum In-Process Dimension
Maximum In-Process Dimension
Minimum Finish Dimension
Maximum Finish Dimension
Reference Dimension
 
Dim. EA
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--
2.75878 in. (70.073 mm)
2.76877 in. (70.327 mm)
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Dim. EC
--
--
0.6693 in. (17.00 mm)
0.6889 in. (17.50 mm)
--
 
Dia EF
--
--
16.4438 in. (417.67 mm)
16.4633 in. (418.17 mm)
--
 
Dia EG
--
--
13.3249 in. (338.45 mm)
13.3444 in. (338.95 mm)
--
 
Dia EH
--
--
13.6418 in. (346.50 mm)
13.6811 in. (347.50 mm)
--
 
Dim. EI
--
--
0.1449 in. (3.68 mm)
0.1551 in. (3.94 mm)
--
 
Dia EJ
--
--
11.80835 in. (299.932 mm)
11.81133 in. (300.008 mm)
--
 
Dia EK
--
--
13.63052 in. (346.215 mm)
13.63287 in. (346.275 mm)
--
 
Dia EN
--
--
12.1150 in. (307.72 mm)
12.1251 in. (307.98 mm)
--
 
Dim. ES
--
--
97.8162 in. (2484.53 mm)
97.8358 in. (2485.03 mm)
--
4 . Setup Information.
Subtask 72-58-40-350-025
A.Set-up the shaft for machining. Refer to Figure 901 and as follows:
(1)Install the shaft on the machine and/or fixture as follows:
(a)You can use the conical centering surfaces on the shaft two ends.
(2)Adjust the shaft position until diameter A and diameter B runout is 0.00047 inch (0.012 mm) or less.
5 . Procedure.
Subtask 72-58-40-350-026
CAUTION:
DO THIS REPAIR IN 24 HOURS OR LESS AFTER THE REMOVAL OF THE PROTECTIVE PAINT FROM THE SHAFT BECAUSE CORROSION WILL CAUSE DAMAGE TO THE SHAFT.
A.If it is not possible to do this repair in 24 hours or less, apply protective oil to prevent corrosion of the shaft. Refer to TASK 72-58-00-550-801 (72-58-00, STORAGE 001).
Subtask 72-58-40-160-002
B.If necessary, clean the shaft. Refer to TASK 72-58-40-100-801 (72-58-40, CLEANING 001).
Subtask 72-58-40-220-090
C.Do a dimensional inspection of the shaft area that you will machine. Refer to Subtask 72-58-40-220-089 (paragraph 3.A.), Dimensional Information and Figure 902.
Subtask 72-58-40-350-027
D.If necessary, read and record all identity marks on the shaft outer diameter EF surface. Refer to Figure 901 and as follows:
(1)Recording of the marks is necessary when you machine the shaft diameter EF.
(2)It is necessary to record the shaft marking letters, marking values (if numerical marking), marking location, and font size if marking is necessary in Subtask 72-58-40-350-028 (paragraph 5.K.).
Subtask 72-58-40-350-030
(3)Shaft identification marks that you will record must include the information that follows:
(a)Part or assembly identification number.
(b)Manufacturer identification number.
(c)Service bulletin identification (if necessary).
(d)Part serial number.
(e)T mark at the 12 o'clock position.
(f)Shaft length from surface Z to surface ED marked as xxx.xx mm.
(g)Location of L, surface ED lowest runout.
Subtask 72-58-40-350-031
E.If it is necessary to machine the shaft surface ET or surface EL, remove all the shank nuts. Refer to TASK 72-58-40-300-802 (72-58-40, REPAIR 004).
Subtask 72-58-40-320-005
CAUTION:
REMOVE ONLY A MINIMUM QUANTITY OF MATERIAL FROM THE SHAFT DAMAGED AREAS. DO NOT REMOVE MORE THAN THE FINISH DIMENSIONS. DAMAGE TO THE SHAFT CAN OCCUR.
F.Machine surface EB, surface ED, surface EL, surface ET, diameter EF, diameter EG, diameter EJ, diameter EK, and diameter EN of the shaft to remove all the damage in the repair area. Refer to TASK 70-00-03-800-004 (MACHINING DATA), Subtask 72-58-40-220-089 (paragraph 3.A.), Dimensional Information, Figure 902, and as follows:
(1)Set-up the shaft for machining. Refer to Subtask 72-58-40-350-025 (paragraph 4.A.), Setup Information.
(2)Machine the shaft to remove all defects in the repair area as follows:
Subtask 72-58-40-220-091
(a)Make sure that you remove only a minimum quantity of material necessary to remove the surface defects.
(b)Make sure that all dimensions stay in the limits of Subtask 72-58-40-220-089 (paragraph 3.A.), Dimensional Information, Figure 902, and as follows:
1During the machining of surface ED, make sure that dimension ES, dimension EA, and dimension EC all stay in tolerance.
(3)Surface finish of the shaft diameter EK must be 31 microinches (0.8 micrometers) or better.
(4)Surface finish of surface ED, surface ET, diameter EJ, and diameter EN of the shaft must be 63 microinches (1.6 micrometers) or better.
(5)Unless specified differently, make sure that the shaft surface finish is 91 microinches (2.3 micrometers) or better.
Subtask 72-58-40-320-004
(6)Machine the chamfer at the boltholes, on the shaft surface ED, surface EL, and surface ET.
(7)Break all sharp edges and corners at the shaft repair areas, but not at the chamfer, to 0.00500-0.01500 inch (0.127-0.381 mm).
(8)Break all sharp edges and corners of the chamfer at the shaft repair areas to a maximum radius of 0.01000 inch (0.254 mm).
(9)Remove the shaft from the machine and/or fixture.
Subtask 72-58-40-240-002
CAUTION:
MAKE SURE THAT ALL CONDUCTORS USED TO MAKE MAGNETIC FIELDS ARE CORRECTLY INSULATED TO PREVENT ACCIDENTAL ARC OUT.
CAUTION:
USE AN INSULATED CONDUCTOR FOR CIRCULAR SHOT FIELD GENERATION OR AN ELECTRICAL ARC CAN OCCUR. AN ARC ON THE SHAFT CAN MAKE THE SHAFT UNSERVICEABLE.
G.Alternative Procedure Available. Do a magnetic-particle inspection of the shaft repaired areas. Refer to TASK 72-58-40-200-801 (72-58-40, INSPECTION 001).
NOTE:
A plastic sleeve or plastic pipe can be used as a protection of the central conductor to decrease the risk of an electrical arc on the shaft.
Subtask 72-58-40-220-130
G.A.Alternative Procedure. Do an inspection of the shaft machined areas as follows:
Subtask 72-58-40-110-012
(1)Etch the shaft machined 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:
(a)Use Class C etchant.
Subtask 72-58-40-230-003
(2)Do an inspection of the shaft machined 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:
(a)Use Class D penetrant.
(b)Indications are not permitted.
Subtask 72-58-40-380-008
H.Peen the shaft repaired areas. Refer to TASK 70-47-01-380-016 (SHOTPEENING) and as follows:
(1)Use media size equivalent to S170 or smaller.
(2)Shot media hardness must be 55-65 HRC.
(3)Peening intensity must be 0.010-0.015A.
(4)Minimum of 100 percent coverage is necessary.
Subtask 72-58-40-220-092
I.Do a dimensional inspection and a visual inspection of the shaft machined areas. Refer to Subtask 72-58-40-220-089 (paragraph 3.A.), Dimensional Information, Figure 901, Figure 902, and as follows:
(1)Make sure that all the dimensions in the shaft machined areas agree with the specified limits.
Subtask 72-58-40-220-094
(2)If you repaired the shaft surface ED, measure the distance between surface Z and surface ED as follows:
(a)The measured reading must be accurate to four decimal places in inches (two decimal places in millimeters).
(b)If the shaft actual length is measured in inches, convert the value into millimeters and round to hundredths of a millimeter.
Subtask 72-58-40-350-032
(3)If you repaired the shaft surface ED, record the measured lowest runout point of surface ED with respect to diameter A and diameter B.
Subtask 72-58-40-380-009
WARNING:
DO NOT BREATHE THE PARTICLES FROM BLASTING OR LET THE PARTICLES TOUCH YOU. THE PARTICLES CAN CAUSE DAMAGE, INJURY, OR IRRITATION TO YOU. USE PERSONAL PROTECTION EQUIPMENT. USE LOCAL MECHANICAL EXHAUST VENTILATION OR AN APPROVED RESPIRATOR.
J.If you repaired the shaft surface ED, clean the flange area EM to increase the coefficient of friction. Refer to TASK 70-47-03-380-018 (DRY ABRASIVE BLAST SURFACE FINISHING) and as follows:
(1)Use grit size of 150-220 mesh.
(2)Use nozzle pressure of 28-57 psi (194-393 kPa).
(3)Use a nozzle-to-surface distance of 3.94-5.90 inches (100-150 mm) and an angle of 40-60 degrees from the shaft surface.
Subtask 72-58-40-350-028
K.Put a mark on the shaft diameter EF. Refer to TASK 70-16-00-350-001 (MARKING PRACTICES), TASK 70-16-08-350-001 (DOT PEEN MARKING FOR OPTICAL CHARACTER RECOGNITION), and as follows:
Subtask 72-58-40-210-001
(1)Do a check for the shaft mark information that is changed, illegible, or fully removed. Refer to Subtask 72-58-40-350-030 (paragraph 5.D.(3)).
Subtask 72-58-40-350-029
(2)Line-out the remaining marks on the shaft surface EF that are changed or illegible as follows:
NOTE:
It is not necessary to line-out markings that are clear and will not be changed.
(a)Line-out the remaining markings with two lines.
(3)Put a mark on the shaft surface EF for markings that are changed or fully removed. Refer to Figure 901, Figure 902, and as follows:
(a)Marking information is listed in Subtask 72-58-40-350-030 (paragraph 5.D.(3)) and as follows:
1If surface ED is repaired, refer to Subtask 72-58-40-220-094 (paragraph 5.I.(2)) and Subtask 72-58-40-350-032 (paragraph 5.I.(3)).
(b)Put the markings, but not the T and L markings, adjacent to the initial markings.
(c)For markings that are fully removed, put the new markings adjacent to their initial location.
(d)Put the mark T as follows:
1You must put the mark T back in its initial position or else it will change the circumferential position of the flange during balancing of the shaft.
(e)Put the mark L as follows:
1You must not put the mark L again, if surface ED is not repaired, or else the position of the lowest runout of the flange will be inaccurate.
2If surface ED is repaired, put the mark L at the position of the lowest runout. Refer to Subtask 72-58-40-350-032 (paragraph 5.I.(3)).
(f)Use method 1 or method 2 and make sure that the markings agree with the initial font size.
* * * FOR ALL
Figure 901   Mid Fan Shaft
* * * FOR ALL
Figure 902   (Sheet 1 ) Mid Fan Shaft - Flange Area Dimensions
* * * FOR ALL
Figure 902   (Sheet 2 ) Mid Fan Shaft - Flange Area Dimensions