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TASK 72-58-40-300-801
1 . Repair for the Low Pressure Mid Shaft Assembly.
A.This procedure gives instructions to repair the mid fan shaft (shaft) by doing balance inspection and imbalance correction. Refer to Figure 901.
B.There is no maximum repairable limit to apply to this repair.
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
 
Balancing Machine
Local purchase
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C02-023
Oil, Engine Lubricating
 
C02-097
Lubricant, Anti-Seize Compound (lubricant)
 
C03-039
Paint, Sermetel, Touch-up (touch up paint)
 
C04-035
Solvent, General (isopropyl alcohol)
 
C04-271
Shot, Peening, Cast Steel (AMS 2431/2 ASH), Cast Steel Shot, High Hardness (55-62 HRc) (S170 cast steel shot)
 
C05-003
Marking pen
 
C10-021
Tape, Plastic
 
C10-110
Almen Test Strips
C.Referenced Procedures.
 
ATA No.
Description
 
70-00-03
Machining Data
 
70-16-00
Marking Practices
 
70-16-02
Temporary Marking
 
70-21-00
Chemical Cleaning
 
70-21-03
Cleaning Method 3 - Steam Cleaning
 
70-21-06
Cleaning Method 6 - Heavy-Duty Alkaline Cleaner (Without Inhibited Phosphoric Acid)
 
70-21-22
Cleaning Method 22 - Light-Duty Aqueous Cleaning
 
70-21-23
Cleaning Method 23 - Hand-Wipe Degreasing
 
70-42-00
Blending and Removal of High Metal Procedures
 
70-43-05
Inorganic Aluminum Protective Coating
 
70-47-01
Shotpeening
 
70-47-04
Rotary Flap Peening
 
72-58-40
Repair 013
D.Expendable Parts. None.
E.SPD Information.
 
CSN
Description
 
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Nut, Self Locking (J1092P04)
 
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Bolt, D-Hex Head (J644P06A)
(1)Locally Manufactured SPD. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-58-40-220-070
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.
Subtask 72-58-40-350-001
A.Set-up the shaft for balance measurement. Refer to Figure 902 and as follows:
(1)Use a balancing machine that can turn the shaft at a speed of 330-640 rpm.
(2)Use datum A or datum G and datum B to set the balance axis.
(3)Turn the shaft in the balancing machine at the specified speed for a minimum of 15 minutes before you do the measurements.
5 . Procedure.
Subtask 72-58-40-220-071
A.Do a static balance inspection of the shaft as follows:
(1)Set-up the shaft for balance measurement. Refer to Subtask 72-58-40-350-001 (paragraph 4.A.), Setup Information.
(2)Set the rotation speed to 330-640 rpm.
(3)Record the imbalance absolute value and direction. The maximum absolute value permitted is 106.29 g-in (2700 g-mm).
Subtask 72-58-40-350-002
(4)If necessary, put a mark on the shaft to show the location and direction of imbalance. Refer to TASK 70-16-00-350-001 (MARKING PRACTICES), TASK 70-16-02-350-017 (TEMPORARY MARKING), and as follows:
(a)Use C05-003  marking pen.
(5)If imbalance correction is necessary, go to Subtask 72-58-40-350-003 (paragraph 5.B.). If it is not necessary, go to Subtask 72-58-40-220-073 (paragraph 5.C.).
Subtask 72-58-40-350-003
B.Do an imbalance correction of the shaft at diameter EF. Refer to Figure 902 and as follows:
NOTE:
Static imbalance correction must be done at diameter EF.
(1)If necessary, apply C10-021  plastic tape to mask the surfaces adjacent to diameter EF.
Subtask 72-58-40-320-001
WARNING:
DO NOT BREATHE THE PARTICLES FROM MACHINING 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.
(2)Alternative Procedure Available. Machine the shaft to remove material at diameter EF. Refer to TASK 70-00-03-800-004 (MACHINING DATA) and as follows:
(a)Do not do concave machining.
Subtask 72-58-40-350-004
(2).A.Alternative Procedure. Blend the shaft to remove material at diameter EF. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) and as follows:
(a)If you do concave blending, the width of removal in all directions must be a minimum of 20 times greater than the depth of the removal.
(3)The surface finish of the repaired surface must be 63 microinches (1.6 micrometers) or better.
(4)The finished dimension of diameter EF must be a minimum of 0.0050 inch (0.13 mm) above the adjacent shaft diameter.
(5)Break all sharp edges to 0.00500-0.01500 inch (0.127-0.381 mm). Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
(6)Remove the plastic tape.
Subtask 72-58-40-220-072
(7)Do Subtask 72-58-40-220-071 (paragraph 5.A.) again to do a static balance inspection.
Subtask 72-58-40-220-073
C.Do a dynamic balance inspection of the shaft as follows:
(1)Set-up the shaft for balance measurement. Refer to Subtask 72-58-40-350-001 (paragraph 4.A.), Setup Information.
(2)Set the inspection plane to plane EC and plane EE.
(3)Set the rotation speed at 330-640 rpm.
(4)Record the imbalance absolute value and direction. The maximum absolute value permitted is 6.20 g-in (158 g-mm).
Subtask 72-58-40-350-005
(5)If necessary, put a mark on the shaft to show the location and direction of imbalance. Refer to Refer to TASK 70-16-00-350-001 (MARKING PRACTICES), TASK 70-16-02-350-017 (TEMPORARY MARKING), and as follows:
(a)Use C05-003  marking pen.
Subtask 72-58-40-350-006
D.If necessary, do an imbalance correction of the shaft at plane EE. Refer to Figure 902 and as follows:
NOTE:
Dynamic imbalance correction at plane EE must be done by removing raised material from diameter EG.
(1)If necessary, apply C10-021  plastic tape to mask the surfaces adjacent to diameter EG.
Subtask 72-58-40-320-002
WARNING:
DO NOT BREATHE THE PARTICLES FROM MACHINING 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.
(2)Alternative Procedure Available. Machine the shaft to remove material at diameter EG. Refer to TASK 70-00-03-800-004 (MACHINING DATA) and as follows:
(a)Do not do concave machining.
Subtask 72-58-40-350-007
(2).A.Alternative Procedure. Blend the shaft to remove material at diameter EG. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) and as follows:
(a)If you do concave blending, the width of removal in all directions must be a minimum of 20 times greater than the depth of the removal.
(3)The surface finish of the repaired surface must be 63 microinches (1.6 micrometers) or better.
(4)The finished dimension of diameter EG must be a minimum of 0.005 inch (0.13 mm) above the adjacent shaft diameter.
(5)Break all sharp edges to 0.00500-0.01500 inch (0.127-0.381 mm). Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
(6)Remove the plastic tape.
Subtask 72-58-40-350-008
E.If necessary, do an imbalance correction of the shaft at plane EC. Refer to Figure 901, Figure 902, and as follows:
NOTE:
Dynamic imbalance correction at plane EC must be done by installing or removing balance bolts and self-locking nuts on the seal flange.
Subtask 72-58-40-110-006
(1)Use C04-035  isopropyl alcohol to clean the boltholes before you install the bolt.
Subtask 72-58-40-220-074
(2)Do a visual inspection of the boltholes as follows:
(a)Use 10X magnification and white light.
(b)Indications are not permitted.
Subtask 72-58-40-110-014
(3)If you are using the balance bolts and nuts again, clean them. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING), TASK 70-21-03-160-001 (CLEANING METHOD NO. 3 - STEAM CLEANING), TASK 70-21-06-110-004 (CLEANING METHOD NO. 6 - HEAVY-DUTY ALKALINE CLEANER (WITHOUT INHIBITED PHOSPHORIC ACID)), TASK 70-21-22-110-801 (CLEANING METHOD NO. 22 - LIGHT DUTY AQUEOUS CLEANING), and TASK 70-21-23-110-053 (CLEANING METHOD NO. 23 - HAND-WIPE DEGREASING).
NOTE:
If you are using new balance bolts or nuts, cleaning is not necessary.
Subtask 72-58-40-350-009
(4)Install or remove balance bolt, J644P06A, and self-locking nut, J1092P04, where necessary to correct the imbalance, and do as follows:
(a)Apply C02-023  engine oil or C02-097  lubricant to the nut threads and bearing face before you install them into the flange.
(5)Torque the balance bolt to 110 to 120 lb in. (12.5 to 13.5 Nm).
Subtask 72-58-40-220-075
F.Do Subtask 72-58-40-220-073 (paragraph 5.C.) again to do a dynamic balance inspection.
Subtask 72-58-40-220-076
G.Do a visual inspection of the shaft repaired areas as follows:
(1)Use a minimum of 10X magnification and white light.
(2)Indications are not permitted.
Subtask 72-58-40-220-077
H.Do a visual inspection of the shaft datum A or datum G and datum B as follows:
(1)Use white light and a minimum of 10X magnification.
(2)Missing, peeling, and loose coating are not permitted.
Subtask 72-58-40-380-001
I.Alternative Procedure Available. Peen the shaft repaired areas. Refer to TASK 70-47-01-380-016 (SHOTPEENING) and as follows:
(1)Use C04-271  S170 cast steel shot.
(2)Use an intensity of 10-15A.
(3)A minimum of 100 percent coverage, fade out to adjacent peened surfaces, is necessary.
(4)Use C10-110  almen test strips and almen strip holder to verify the intensity at the shaft repaired areas.
Subtask 72-58-40-380-002
I.A.Alternative Procedure. Peen the shaft repaired areas. Refer to TASK 70-47-04-380-019 (ROTARY FLAP PEENING) and as follows:
(1)The maximum flapper shot size must be S330 or equivalent.
(2)Use an intensity of 14-21A (converted value for magnetic almen holder).
(3)A minimum of 100 percent coverage, fade out to adjacent peened surfaces is necessary.
(4)Use C10-110  almen test strips and almen strip holder to verify the intensity at the shaft repaired areas.
Subtask 72-58-40-380-003
J.Surface-treat the shaft repaired areas, as follows:
(1)For part numbers 2331M20G02   , 2331M20G03   , 2332M81G01   , 2332M81G03   , and 2332M81G04   , refer to TASK 70-43-05-380-005 (INORGANIC ALUMINUM PROTECTIVE COATING) and do as follows:
(a)Use only the C03-039  touch up paint and the touch up procedure specified.
(b)Apply C03-039  touch up paint to datum A or datum G and datum B, if necessary.
(c)Three coats are required. Overlap to adjacent painted area is necessary for full coverage. Bare metal is not permitted.
(2)For part numbers 2332M81G05   , 2440M20G05   , 2440M91G05   , and 2440M91G06   , refer to TASK 72-58-40-300-812 (72-58-40, REPAIR 013).
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Figure 901   Mid Fan Shaft
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Figure 902   (Sheet 1 ) Mid Fan Shaft - Dimensional Information
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Figure 902   (Sheet 1 ) Mid Fan Shaft - Dimensional Information
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Figure 902   (Sheet 2 ) Mid Fan Shaft - Dimensional Information
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Figure 902   (Sheet 3 ) Mid Fan Shaft - Dimensional Information
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Figure 902   (Sheet 1 ) Mid Fan Shaft - Dimensional Information
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Figure 902   (Sheet 4 ) Mid Fan Shaft - Dimensional Information