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TASK 72-56-47-300-801
1 . Repair for the Low Pressure Turbine Cone Shaft Assembly.
A.This procedure gives instructions to repair the low pressure turbine (LPT) cone shaft assembly (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.
NOTE:
For 72-56-47, Inspection 001. Refer to TASK 72-56-47-200-801 (72-56-47, INSPECTION 001) .
(4)Visual Inspection.
(i)Do an inspection of the shank nuts for:
1Missing:
Maximum repairable limit:
Any amount.
2Cracks:
Maximum repairable limit:
Any amount.
3Damaged threads:
Maximum repairable limit:
Any amount.
4Self-locking feature:
Maximum repairable limit:
Any amount.
5Looseness:
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)
 
2331M53G01  
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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.
 
Code No.
Description
 
C10-021
Tape, Plastic
 
C10-067
Tape, Platers
C.Referenced Procedures.
 
ATA No.
Description
 
70-21-00
Chemical Cleaning
 
70-21-23
Cleaning Method 23 - Hand-Wipe Degreasing
 
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
 
70-48-13
Shank Nut Repair
 
72-56-47
Inspection 001
D.Expendable Parts. None.
E.SPD Information.
 
CSN
Description
 
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Nut, Shank Slflkg (P/N 1767M45P02) (shank nut)
 
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Nut, Shank Slflkg (P/N 2331M83P01) (shank nut)
(1)Locally Manufactured SPD. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-56-47-220-065
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.
4 . Setup Information.
None.
5 . Procedure.
Subtask 72-56-47-350-005
A.Remove the damaged shank nuts from the shaft. Refer to TASK 70-48-13-350-024 (SHANK NUT REPAIR), Figure 901, Figure 902, and as follows:
(1)Apply C10-021  plastic tape, C10-067  platers tape, or an equivalent maskant to the shaft to prevent damage to the shaft during removal.
(2)Use a drill bit of 0.272-0.307 inch (6.9-7.8 mm) in diameter with a conical cutting edge of 60-62 degrees.
(3)Drill the shank nut to a depth that is sufficient to make the base of the flared shank of the shank nut thin/loose.
(4)Install a 0.25-28 UNJ-3A screw into the shank nut.
(5)Lightly tap the 0.25-28 UNJ-3A screw with a hammer to remove the nut from the shank nut hole.
(6)Remove the 0.25-28 UNJ-3A screw and nut from the shaft.
Subtask 72-56-47-110-003
B.Clean the exposed shaft 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 72-56-47-110-004
C.Etch the shaft boltholes. 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.
Subtask 72-56-47-200-001
D.Do an inspection of the shaft boltholes where you removed the damaged shank nuts. 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)Refer to TASK 72-56-47-200-801 (72-56-47, INSPECTION 001) for the acceptability limits.
Subtask 72-56-47-200-002
E.Do a visual inspection of the shaft boltholes where you removed the damaged shank nuts. Refer to TASK 72-56-47-200-801 (72-56-47, INSPECTION 001).
Subtask 72-56-47-220-066
F.Do a dimensional inspection of the shaft boltholes where you removed the damaged shank nuts. Refer to Figure 902.
Subtask 72-56-47-350-006
G.Install the new shank nuts on the shaft. Refer to TASK 70-48-13-350-024 (SHANK NUT REPAIR), Figure 901, Figure 902, and as follows:
(1)Apply C10-021  plastic tape, C10-067  platers tape, or an equivalent maskant to the shaft to prevent damage to the shaft during installation.
Subtask 72-56-47-110-005
(2)If necessary, clean the shaft 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 72-56-47-350-007
(3)Use a shank nut P/N 2331M83P01   or shank nut P/N 1767M45P02   .
(4)Axial or transverse movement in the shank nut is not permitted after you install the shank nut on the shaft.
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Figure 901   LPT Cone Shaft Assembly
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Figure 902   (Sheet 1 ) LPT Cone Shaft Assembly - Dimensional Information
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Figure 902   (Sheet 2 ) LPT Cone Shaft Assembly - Dimensional Information