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TASK 72-22-41-300-801
1 . Repair for the Booster Spool.
A.This procedure gives instructions to repair the booster spool (spool) by replacing damaged shank nuts (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 72-22-41, Inspection 001. Refer to TASK 72-22-41-200-805 (72-22-41, INSPECTION 001) .
(4)Visual Inspection.
(h)Do an inspection of each self-locking shank nut (nut) for:
1Loss of self-locking quality (0.250-28UNJF):
Maximum repairable limit:
Any amount.
2Damaged threads:
Maximum repairable limit:
Any amount.
3Looseness:
Maximum repairable limit:
Any amount.
4Cracks in the shank:
Maximum repairable limit:
Any amount.
5Missing nuts:
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)
 
10039815  
10079460  
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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
 
Spanner
Local Purchase
(3)Locally Manufactured Tools.
 
Description
Figure
 
Flaring Tool
902
 
Shank Nut Extractor (extracting tool)
903
B.Consumable Materials.
 
Code No.
Description
 
C02-008
Petroleum Jelly (lubricant)
 
C04-035
Solvent, General (isopropyl alcohol)
 
C10-021
Tape, Plastic (masking)
 
C10-182
Cloth, Cleaning For Aircraft Structural (SAE-AMS 3819, BMS 15-5) (lint-free cloth)
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
 
70-42-00
Blending and Removal of High Metal Procedures
 
70-48-13
Shank Nut Repair
 
72-22-41
Inspection 001
D.Expendable Parts. None.
E.SPD Information.
 
CSN
Description
 
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Nut, Self Locking-Shank (1710M49P01) (nut)
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-22-41-220-057
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 reconvert from millimeters to inches.
NOTE:
Reference dimensions do not require inspection.
4 . Setup Information.
Subtask 72-22-41-350-001
A.Set-up to remove the damaged nuts from the spool. Refer to Figure 904 and as follows:
Subtask 72-22-41-930-001
(1)If necessary, make an extracting tool. Refer to Figure 903.
Subtask 72-22-41-350-005
(2)Install a screw (item 2) into the nut. Tighten the screw (item 2) so that approximately three threads are in the nut.
(3)Install the block (item 1) so that the rubber pad is on the same side as the nut.
(4)Make sure that the flange is seated flat on the rubber pad with no clearance in between.
(5)Install the screw (item 3) into the block (item 1) so that the end of the screw (item 3) touches the head of the screw (item 2).
Subtask 72-22-41-350-006
B.Set-up to install the new nuts. Refer to Figure 905 and as follows:
Subtask 72-22-41-930-002
(1)If necessary, make the flaring tool. Refer to Figure 902.
Subtask 72-22-41-350-007
(2)Assemble the rest block (item 1), clamp block (item 2), and set screws (item 3) together into a holder fixture.
(3)Assemble the rod (item 4), pin (item 5), cotter ring (item 6), ball joint linkage (item 7), and flaring head (item 8) together into a flaring tool.
(4)Install the holder fixture (item 1, 2, 3) onto the nut.
(5)Install the flaring tool (item 4, 5, 6, 7, 8) into the holder fixture (item 1, 2, 3).
(6)Make the centerline of the flaring tool align with the centerline of the nut.
5 . Procedure.
Subtask 72-22-41-350-002
CAUTION:
TAKE PRECAUTION WHEN REMOVING THE NUT FROM THE SPOOL. DO NOT SCRATCH/DAMAGE THE SPOOL FLANGE OR THE CONE SURFACE.
A.Remove the damaged nuts from the spool. Refer to TASK 70-48-13-350-024 (SHANK NUT REPAIR) and as follows:
(1)Apply C10-021  masking to the spool cone surface adjacent to the nut. Refer to Figure 906.
(2)Set-up to remove the nut from the spool. Refer to Subtask 72-22-41-350-001 (paragraph 4.A.), Setup Information.
(3)Use a spanner to tighten the screw (item 3) so that it pushes the head of the screw (item 2) down into the flange.
(4)Continue to tighten the screw (item 3) until the nut is pushed out of the flange.
(5)Remove the extracting tool and masking.
Subtask 72-22-41-110-006
WARNING:
ISOPROPYL ALCOHOL IS TOXIC AND FLAMMABLE. USE PERSONAL PROTECTION EQUIPMENT. USE IN A WELL-VENTILATED AREA.
(6)Clean the exposed holes with C04-035  isopropyl alcohol and a C10-182  lint-free cloth.
Subtask 72-22-41-200-003
(7)Do an inspection of the holes for nicks/burrs, and distortion/damage caused by the removal process. Refer to TASK 72-22-41-200-805 (72-22-41, INSPECTION 001), Figure 901, and as follows:
(a)If the holes do not agree with the dimensions in Figure 901, the spool is not repairable.
Subtask 72-22-41-350-003
B.If necessary, blend the holes and surrounding areas to remove burrs and sharp edges. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) and as follows:
(1)Blend to remove the burrs and high metal. Smooth to adjacent parent metal contour. High metal is not permitted.
(2)Make sure the flange thickness at the blended areas agree with the dimensions in Figure 901.
Subtask 72-22-41-110-005
C.Etch the holes. 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 72-22-41-200-001
D.Do an inspection of the holes. 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)Indications less than 0.015 inch (0.38 mm) are permitted.
(3)Indications are not permitted in fillets.
(4)Indications must not cross corners.
(5)Linear indications are not permitted.
NOTE:
Linear indications are indications that are three times longer than they are wide.
Subtask 72-22-41-350-004
E.Install the new nut (1710M49P01   ) in the spool flange. Refer to TASK 70-48-13-350-024 (SHANK NUT REPAIR), Figure 902, and as follows:
(1)Set-up to install the nut. Refer to Subtask 72-22-41-350-006 (paragraph 4.B.), Setup Information and as follows:
(a)The flaring tool must support the base of the nut during the whole flaring process.
Subtask 72-22-41-640-001
(2)Apply C02-008  lubricant on the flaring tip of the flaring tool to decrease the risk of cracking in the nut shank.
(3)Turn the flaring tool so that it moves towards the nut and flares the nut shank.
Subtask 72-22-41-220-058
CAUTION:
DO NOT THREAD A SCREW INTO THE NUT FOR VERIFICATION OF THE INSTALLATION. THE SELF-LOCKING PERFORMANCE OF THE NUT WILL DETERIORATE EACH TIME A SCREW IS INSTALLED AND REMOVED.
(4)Do a visual inspection of the flared shank of the nut as follows:
(a)Damage to the plating on the flared surface is permitted.
(b)The nut shank must be below the flange surface.
(c)Under hand pressure, no movement is permitted in the shank nut after swaging.
(d)Rotation of the nut up to the machined shoulder of the flange is permitted.
(e)Damage to the shank nut caused by the flaring tool is permitted up to a maximum of 0.003 inch (0.07 mm) in depth.
Subtask 72-22-41-200-002
F.Do an inspection of the flared shank of the nut. 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 A penetrant.
(2)Linear indications are not permitted.
NOTE:
Linear indications are indications that are three times longer than they are wide.
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Figure 901   (Sheet 1 ) Booster Spool Dimensional Information
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Figure 901   (Sheet 2 ) Booster Spool Dimensional Information
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Figure 902   (Sheet 1 ) Flaring Tool
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Figure 902   (Sheet 2 ) Flaring Tool
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Figure 902   (Sheet 3 ) Flaring Tool
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Figure 902   (Sheet 4 ) Flaring Tool
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Figure 902   (Sheet 5 ) Flaring Tool
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Figure 902   (Sheet 6 ) Flaring Tool
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Figure 903   Shank Nut Extractor
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Figure 904   Shank Nut Extractor
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Figure 905   Set-up to Install the Shank Nut
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Figure 906   Masking Locations