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TASK 72-58-40-300-802
1 . Repair for the Mid Fan Shaft.
A.This procedure gives instructions to repair the mid fan shaft (shaft) by replacing the damaged shank nuts. 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.
(t)Do an inspection of the shank nut on the seal air flange for:
1Loss of self-locking quality:
Maximum repairable limit:
Any amount.
2Damaged threads:
Maximum repairable limit:
Any amount.
4Cracks in the shank:
Maximum repairable limit:
Any amount.
5Missing shank nut:
Maximum repairable limit:
Any amount.
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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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.
 
Description
Manufacturer
 
0.25-28 UNJ-3A screw
Local Purchase
 
Hammer
Local purchase
(3)Locally Manufactured Tools. None.
B.Consumable Materials. None.
C.Referenced Procedures.
 
ATA No.
Description
 
70-21-00
Chemical Cleaning
 
70-21-23
Cleaning Method 23 - Hand-Wipe Degreasing
 
70-48-13
Shank Nut Repair
 
72-58-40
Inspection 001
D.Expendable Parts. None.
E.SPD Information.
 
CSN
Description
 
--
Nut, Shank Slflkg (P/N 1767M45P02) (shank nut)
 
--
Nut, Shank Slflkg (P/N 2331M83P01) (shank nut)
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-58-40-220-078
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.
4 . Setup Information.
None.
5 . Procedure.
Subtask 72-58-40-350-010
A.Remove the damaged shank nuts. Refer to TASK 70-48-13-350-024 (SHANK NUT REPAIR), Figure 901, and as follows:
NOTE:
The use of alternative tools/fixtures to remove the shank nuts, such as hydraulic plunger or pliers, are permitted.
(1)Use a 0.272-0.307 inch (6.9-7.8 mm) diameter drill bit with 60-62 degrees conical cutting edge.
(2)Drill to a depth that is sufficient to make the base of the flared shank of the shank nut thin.
(3)Install a 0.25-28 UNJ-3A screw into the shank nut.
(4)Lightly tap the screw with a hammer to detach the nut from the flared shank.
(5)Remove the screw and nut.
Subtask 72-58-40-110-007
B.Clean the exposed boltholes. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING) and TASK 70-21-23-110-053 (CLEANING METHOD 23 - HAND-WIPE DEGREASING).
Subtask 72-58-40-200-001
C.Do a magnetic-particle inspection of the boltholes where you removed the damaged shank nuts. Refer to TASK 72-58-40-200-801 (72-58-40, INSPECTION 001).
Subtask 72-58-40-350-011
D.Install the new shank nuts. Refer to TASK 70-48-13-350-024 (SHANK NUT REPAIR), Figure 901, and as follows:
NOTE:
The use of alternative tools/fixtures to remove the shank nuts, such as hydraulic plunger or pliers, are permitted.
Subtask 72-58-40-110-008
(1)If necessary, clean the boltholes. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING) and TASK 70-21-23-110-053 (CLEANING METHOD 23 - HAND-WIPE DEGREASING).
Subtask 72-58-40-350-012
(2)Use a shank nut (P/N 2331M83P01   ) or shank nut (P/N 1767M45P02   ).
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Figure 901   (Sheet 1 ) Mid Fan Shaft
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Figure 901   (Sheet 2 ) Mid Fan Shaft