* * * FOR ALL
TASK 72-58-40-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the mid fan shaft.
  •
(01-010 , 72-58-00) (SIN 810A0) (PRE SB 72-0040 )
  •
(01-011 , 72-58-00) (SIN 810A0) (SB 72-0040 ).
2 . Tools, Equipment, and Materials.
NOTE:
You can use equivalent alternatives for tools, equipment, and consumable materials.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C02-019
Oil, Engine Lubricating (lubricant)
 
C02-025
Oil, Preservation (preservation oil)
 
C02-059
Oil, Water Displacing (Oil)
 
C02-088
Deleted
 
C03-038
Deleted
 
C03-039
Deleted
 
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)
 
C10-021
Tape, Plastic
 
C10-252
Paper, Vapor Corrosion Inhibitor (VCI paper)
C.Referenced Procedures.
 
ATA No.
Description
 
Deleted

 
70-21-22
Cleaning Method No. 22 - Light Duty Aqueous Cleaning
 
70-32-01
Magnetic-Particle Inspection
 
70-42-00
Blending And Removal Of High Metal Procedures
 
Deleted

 
70-47-01
Shotpeening
 
70-47-04
Rotary Flap Peening
 
70-48-13
Shank Nut Repair
 
70-51-00
Tightening Practices and Torque Values
 
72-58-40
Cleaning 001
 
72-58-40
Repair 001
 
72-58-40
Repair 002
 
72-58-40
Repair 003
 
72-58-40
Repair 004
 
72-58-40
Repair 013
D.Expendable Parts. None.
3 . Specific Inspection Procedure.
Subtask 72-58-40-240-001
CAUTION:
MAKE SURE 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. USE A PLASTIC SLEEVE OR PLASTIC PIPE OVER THE CENTRAL CONDUCTOR TO DECREASE THE RISK OF AN ELECTRICAL ARC ON THE MID FAN SHAFT. AN ARC ON THE SHAFT CAN CAUSE THE COMPONENT TO BECOME UNSERVICEABLE.
NOTE:
Any findings beyond manual limits that may be indicative of a possible crack and/or metallurgical defect must be reported to GE through a myGEAviation Technical Inquiry.
A.Do a magnetic-particle inspection of the mid fan shaft. Refer to TASK 70-32-01-240-001 (MAGNETIC-PARTICLE METHOD).
(1)Remove the shank nuts. Refer to TASK 72-58-40-300-802 (72-58-40, REPAIR 004).
(2)Make sure that the surface coating has been removed before you do the magnetic-particle inspection. Refer to TASK 72-58-40-100-801 (72-58-40, CLEANING 001).
(3)Do a magnetic-particle inspection of the outer diameter surfaces (area A) of the mid fan shaft for longitudinal defects. Refer to Figure 801.
(a)Use 1800 amperes to make a circular field.
(4)Use a residual method of magnetic-particle inspection to examine the inner diameter (area C) of the mid fan shaft for longitudinal defects. Refer to Figure 801 and Figure 802.
(a)Use 1800 amperes to make a circular field to magnetize.
(b)Stop the electric current to let the suspension fluid flow slowly through the shaft. Turn the shaft to make sure 100 percent of the inner diameter is covered by the fluid.
(c)Tilt the shaft slowly and remove unwanted fluid from the inner diameter.
(d)Examine the inner diameter of the shaft with a black-light borescope. Indications interpreted as cracks are not permitted. Use a dental mirror or equivalent on the inside of the spline.
(5)Do an MPI of area B of the mid fan shaft for longitudinal defects. Refer to Figure 801.
NOTE:
MPI Of the inner surfaces of the holes is necessary if the shank nuts or balance bolts were removed.
(a)Use 4000 amperes to make a circular field.
(6)Do a magnetic-particle inspection of the outer diameter surface and cone body surfaces of the mid fan shaft for circumferential defects. Refer to Figure 802.
(a)Use 8000 ampere-turns to make a longitudinal field.
(7)Use a residual method of magnetic-particle inspection to examine the inner diameter (area C) of the mid fan shaft for circumferential defects. Refer to Figure 802.
(a)Use 8000 ampere-turns to make a longitudinal field to magnetize the mid fan shaft.
(b)Stop the electric current to let the suspension fluid flow slowly through the mid fan shaft. Turn the shaft to make sure 100 percent of the inner diameter is covered by the fluid.
(c)Tilt the mid fan shaft slowly and remove unwanted fluid from the inner diameter.
(d)Examine the inner diameter of the mid fan shaft with a black-light borescope. Indications interpreted as cracks are not permitted. Use a dental mirror or equivalent on the inside of the spline.
(8)Demagnetize the mid fan shaft.
Subtask 72-58-40-110-005
B.Remove the suspension fluid from the mid fan shaft. Refer to TASK 70-21-22-110-050 (CLEANING METHOD 22 - LIGHT DUTY AQUEOUS CLEANING (Method 2)).
Subtask 72-58-40-620-001
C.Do the procedure that follows to protect the shaft from corrosion during the inspection and repair process:
Subtask 72-58-40-620-002
WARNING:
REFER TO THE PRODUCT LABEL AND THE MANUFACTURER'S (MATERIAL) SAFETY DATA SHEET (SDS) FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING, AND PROPER USE OF THIS PRODUCT.
(1)Alternative Procedure Available. Apply C02-019  lubricant or C02-025  preservation oil to the shaft, if the inspection or repair process cannot be completed in 24 hours or less. Refer to TASK 72-58-00-550-801 (75-58-00, STORAGE 001).
Subtask 72-58-40-620-003
(1).A.Alternative Procedure. Apply C10-252  VCI paper around the shaft, if the inspection or repair process cannot be completed in 24 hours or less, and as follows:
NOTE:
It is not necessary to apply C10-252  VCI paper to the shaft internal surfaces.
(a)Wind C10-252  VCI paper around the shaft fully to protect all outer surfaces and the two ends of the shaft. If necessary, use C10-021  plastic tape to hold the C10-252  VCI paper.
(b)Each time it is necessary to remove the C10-252   VCI paper to do inspection or repair on the shaft, do as follows:
1Replace the C10-252  VCI paper with a new sheet if apparent signs of wear and damage appear.
2If the same C10-252  VCI paper will be used on the shaft again, make sure that the paper is kept in a sealed polyethylene bag, or in accordance with the manufacturer's recommendation, when it is not applied on the shaft. Incorrect storage of the C10-252  VCI paper will cause it to lose its corrosion protective function.
3Make sure to wait for a minimum of 15 minutes, immediately after the removal of C10-252  VCI paper, before protective coating/lubricant is applied on the shaft.
WARNING:
REFER TO THE PRODUCT LABEL AND THE MANUFACTURER'S (MATERIAL) SAFETY DATA SHEET (SDS) FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING, AND PROPER USE OF THIS PRODUCT.
4Clean the shaft surface with C04-035  isopropyl alcohol before the C10-252   VCI paper is applied again.
5Make sure that the shaft is completely dry before the C10-252  VCI paper is applied again. Moisture can cause corrosion to the shaft.
(c)Apply C10-252  VCI paper to the shaft for a maximum of 70 days only. If the inspection and repair process cannot be completed at the end of 70 days, do Subtask 72-58-40-620-002 (paragraph 3.C.(1)) to protect the shaft again with C02-019  engine oil or C02-025  preservation oil subsequently.
NOTE:
C10-252  VCI paper cannot be used to protect the shaft again after the initial 70-day period.
* * * FOR ALL
Figure 801   Mid Fan Shaft - Inspection
* * * FOR ALL
Figure 802   Inner Diameter Surface Inspection
4 . Visual Inspection.
Refer to Figure 803.
Subtask 72-58-40-220-001
A.Do an inspection of the tang for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
Subtask 72-58-40-220-002
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
•
Any amount, 0.020 inch (0.51 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the shaft.
* * * FOR ALL
Figure 803   (Sheet 1 ) Mid Fan Shaft Inspection Areas
* * * FOR ALL
Figure 803   (Sheet 2 ) Mid Fan Shaft Inspection Areas
* * * FOR ALL
Figure 803   (Sheet 3 ) Mid Fan Shaft Inspection Areas
* * * FOR ALL
Figure 803   (Sheet 4 ) Mid Fan Shaft Inspection Areas
* * * FOR ALL
Figure 803   (Sheet 5 ) Mid Fan Shaft Inspection Areas
* * * FOR ALL
Figure 803   (Sheet 6 ) Mid Fan Shaft Inspection Areas
* * * FOR ALL
Figure 803   (Sheet 7 ) Mid Fan Shaft Inspection Areas
Subtask 72-58-40-220-003
B.Do an inspection of the outer thread for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-004
(1)Damages or missing threads:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Repairable if the total added length of the damage is less than 50 percent of one complete thread. Total removal of entrance thread is permitted. All thread pickup and high metal must be removed.
Repair method:
•
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen after blending is not permitted.
Subtask 72-58-40-220-005
C.Do an inspection of area D of the spline for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-006
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-007
(1)Fretting:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-008
(1)Contact marks:
Maximum serviceable limit:
Any amount, if there is no depth.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-009
D.Do an inspection of area E of the spline for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-010
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-011
E.Do an inspection of the outer diameter of the spline for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-012
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
•
Replace the mid fan shaft.
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Subtask 72-58-40-220-013
F.Do an inspection of any other area of the spline for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-014
(2)Nicks, dents, or scratches:
Maximum serviceable limit:
•
Any amount, 0.004 inch (0.10 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-015
G.Do an inspection of the adjusting washer seating surface for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-016
(2)Nicks, dents, or scratches:
Maximum serviceable limit:
•
Any amount, 0.004 inch (0.10 mm) in depth and 0.020 (0.51 mm) in width after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-017
(3)Fretting:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-018
(4)Contact marks:
Maximum serviceable limit:
Any amount, if there is no depth.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-019
H.Do an inspection of the forward pilot outer diameter for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-020
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
•
Any amount, 0.004 inch (0.10 mm) in depth and 0.020 inch (0.51 mm) in width after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-021
(3)Wear or galling:
Maximum serviceable limit:
•
Any amount, 0.004 inch (0.10 mm) in depth after the removal of high metal if the total damaged area is not more than 50 percent of the total surface. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-022
I.Do an inspection of the aft pilot outer diameter for:
(1)Cracks:
Maximum repairable limit:
Not repairable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-023
CAUTION:
IF THE DAMAGED AREA HAS THERMAL SPRAY COATING, THEN SWAB ETCHING, FPI, AND SHOTPEENING ARE NOT NECESSARY AFTER THE BLENDING PROCEDURE, SPECIFIED IN TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES). DAMAGE TO THE THERMAL SPRAY COATING CAN OCCUR.
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
•
Any amount, 0.006 inch (0.15 mm) in depth, after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
Deleted.
•
Deleted.
•
Deleted.
NOTE:
If the damaged area does not have thermal spray coating, then swab etching, FPI, and shotpeening are not necessary after the blending procedure.
Repair method:
Repair the mid fan shaft. Refer to TASK 72-58-40-300-809 (72-58-40, REPAIR 011).
Subtask 72-58-40-220-024
CAUTION:
IF THE DAMAGED AREA HAS THERMAL SPRAY COATING, THEN SWAB ETCHING, FPI, AND SHOTPEENING ARE NOT NECESSARY AFTER THE BLENDING PROCEDURE, SPECIFIED IN TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES). DAMAGE TO THE THERMAL SPRAY COATING CAN OCCUR.
(3)Wear or galling:
Maximum serviceable limit:
•
Any amount, 0.004 inch (0.10 mm) in depth after the removal of high metal if the total damaged area is not more than 25 percent of the total surface. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Deleted.
•
Deleted.
•
Deleted.
NOTE:
If the damaged area does not have thermal spray coating, then swab etching, FPI, and shotpeening are not necessary after the blending procedure.
Repair method:
Repair the mid fan shaft. Refer to TASK 72-58-40-300-809 (72-58-40, REPAIR 011).
Subtask 72-58-40-220-025
J.Do an inspection of the cone body for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-026
(2)Nicks or scratches:
Maximum serviceable limit:
•
Any amount, 0.004 inch (0.10 mm) in depth and 0.020 inch (0.51 mm) in width after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Swab etching, FPI, and shot peen operations after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), are not necessary
•
After blending, do an MPI of the blended area. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-027
(3)Dents:
Maximum serviceable limit:
•
Any amount, 0.004 (0.10 mm) in depth and 0.020 inch (0.51 mm) in width after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Swab etching, FPI, and shot peen operations after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), are not necessary
•
After blending, do an MPI of the blended area. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-028
(4)Nicks, dents, or scratches within 0.20 inch (5.1 mm) from the upper air hole:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-138
(5)Corrosion pit on area EW:
Maximum serviceable limit:
Not serviceable.
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-157
(6)Corrosion pit on area H:
Maximum serviceable limit:
Not serviceable.
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-139
(7)Corrosion pit in all other areas on the cone body:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-029
K.Do an inspection of the mounting flange (without boltholes) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-030
(2)Nicks, dents, or scratches:
Maximum serviceable limit:
•
Any amount, 0.005 inch (0.13 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Swab etching, FPI, and shot peen operations after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), are not necessary
•
After blending, do an MPI of the blended area. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.010 inch (0.25 mm) from original contour.
Repair method:
•
Blend the damaged area. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Swab etching, FPI, and shot peen operations after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), are not necessary
•
After blending, do an MPI of the blended area. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Subtask 72-58-40-220-031
(3)Corrosion pit (area EX):
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Deleted.
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-158
(3).A.Corrosion pit (surface EB, diameter EF, and area EV):
Maximum serviceable limit:
Not serviceable.
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-140
(3).B.Corrosion pit on area EY:
Maximum serviceable limit:
Not serviceable.
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-032
(4)Nicks, dents, or scratches on the flange face:
Maximum serviceable limit:
•
Any amount, 0.003 inch (0.08 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Swab etching, FPI, and shot peen operations after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), are not necessary
•
After blending, do an MPI of the blended area. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Subtask 72-58-40-220-067
(5)Fretting or galling in Area Y on the forward flange face:
Maximum serviceable limit:
Any amount, if the maximum wear is not more than 0.001 inch (0.02 mm) in depth, and the total fretting or galling area is less than 15 percent of each bolthole.
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Subtask 72-58-40-220-068
(6)Fretting or galling in all other areas on the forward flange face:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth.
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Subtask 72-58-40-220-069
(7)Fretting or galling on the aft flange face:
Maximum serviceable limit:
Any amount, 0.001 inch (0.02 mm) in depth.
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Subtask 72-58-40-220-034
(8)Corrosion pit on the flange face (surface ED):
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Deleted.
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-035
(9)Contact marks:
Maximum serviceable limit:
Any amount, if there is no depth.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-036
L.Do an inspection of the mounting flange boltholes for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-037
(2)Nicks, dents, scratches, or pits:
Maximum serviceable limit:
Not serviceable.
Repair method:
Machine the boltholes to remove damage. Refer to TASK 72-58-40-300-810 (72-58-40, REPAIR 012) .
Subtask 72-58-40-220-038
(3)Corrosion pit:
Maximum serviceable limit:
Not serviceable.
Repair method:
Machine the boltholes to remove damage. Refer to TASK 72-58-40-300-810 (72-58-40, REPAIR 012) .
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-039
M.Do an inspection of the seal air flange (surface ET, surface EL, diameter EG, area EU, and area EZ) (without shank nut holes and balance weight holes) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-040
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
•
Any amount, 0.005 inch (0.13 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.010 inch (0.25 mm) from original contour.
Repair method:
•
Blend the damaged area. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Subtask 72-58-40-220-043
(3)Corrosion pits:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any number, if damages can be removed with a blend procedure up to 0.010 inch (0.25 mm) in depth.
Repair method:
•
Blend the damaged area. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Machine the shaft damaged area. Refer to TASK 72-58-40-300-805 (72-58-40, REPAIR 005).
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-131
M.A.Do an inspection of the seal air flange shank nut holes for:
(1)Nicks, dents, and scratches (including chamfer):
Maximum serviceable limit:
•
Any amount, 0.005 inch (0.13 mm), in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Maximum repairable limit:
Not repairable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-132
(2)Corrosion pits on inside diameter:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any number, if diameter is in 0.327 inch (8.32 mm) after damages are removed with a blend procedure. Damages can be removed by either local blending or 360 full circumference blending.
Repair method:
•
Blend the damaged area. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-133
(3)Corrosion pits on fwd chamfer:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any number, if damages can be removed with a blend procedure up to 0.006 inch (0.15 mm) in depth.
Repair method:
•
Blend the damaged area. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-134
(4)Corrosion pits on aft chamfer:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any number, if damages can be removed with a blend procedure up to 0.002 inch (0.05 mm) in depth.
Repair method:
•
Blend the damaged area. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-135
M.B.Do an inspection of the seal air flange balance weight holes for:
(1)Nicks, dents, and scratches (including chamfer):
Maximum serviceable limit:
•
Any amount, 0.005 inch (0.13 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Maximum repairable limit:
Not repairable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-136
(2)Corrosion pits on inside diameter:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any number, if diameter is in 0.270 inch (6.88 mm) after damages are removed with a blend procedure. Damages can be removed by either local blending or 360 full circumference blending.
Repair method:
•
Blend the damaged area. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-137
(3)Corrosion pits on aft chamfer:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any number, if damages can be removed with a blend procedure up to 0.006 inch (0.15 mm) in depth.
Repair method:
•
Blend the damaged area. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-044
N.Do an inspection of the internal threads for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-045
(2)Thread damage:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Repairable if the total added length of the damage is less than 50 percent of one complete thread. Total removal of entrance thread is permitted. All thread pickup and high metal must be removed.
Repair method:
•
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Swab etching, FPI, and shot peen operations after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), are not necessary
•
After blending, do an MPI of the blended area. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
Shot peen after blending is not permitted.
Subtask 72-58-40-220-046
O.Do an inspection of the ID surface (area C) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-047
(2)Nicks, dents, or scratches (do not include axial scratches with corrosion pits):
Maximum serviceable limit:
•
Any amount, 0.004 inch (0.10 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Swab etching, FPI, and shot peen operations after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), are not necessary
•
After blending, do an MPI of the blended area. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-048
* * * PRE SB   72-0401
(3)Corrosion pit on the area C that does not include the area G2:
Maximum serviceable limit:
Not serviceable.
NOTE:
Deleted.
Repair method:
Repair. Refer to TASK 72-58-40-300-807 (72-58-40, REPAIR 007).
* * * END PRE SB   72-0401
Subtask 72-58-40-220-141
* * * SB   72-0401
(3).A.Corrosion pit on the area C that does not include the area G2:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
* * * END SB   72-0401
Subtask 72-58-40-220-142
* * * FOR ALL.ALL
* * * PRE SB   72-0401
(4)Corrosion pit on the area G2:
Maximum serviceable limit:
Not serviceable.
NOTE:
Deleted.
Repair method:
Repair. Refer to TASK 72-58-40-300-807 (72-58-40, REPAIR 007).
Repair method:
Rework. Refer to SB 72-0401.
* * * END PRE SB   72-0401
Subtask 72-58-40-220-143
* * * FOR ALL.ALL
* * * SB   72-0401
(4).A.Corrosion pit on the area G2:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
* * * END SB   72-0401
Subtask 72-58-40-220-104
* * * PRE SB   72-0401
(5)Axial scratches with corrosion pits on the area C that does not include the area G2. Refer to Figure 803 and Figure 806:
Maximum serviceable limit:
Not serviceable.
NOTE:
Deleted.
Repair method:
Repair. Refer to TASK 72-58-40-300-807 (72-58-40, REPAIR 007).
* * * END PRE SB   72-0401
Subtask 72-58-40-220-144
* * * FOR ALL.ALL
* * * SB   72-0401
(5).A.Axial scratches with corrosion pits on the area C that does not include the area G2. Refer to Figure 803 and Figure 806:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
* * * END SB   72-0401
Subtask 72-58-40-220-145
* * * FOR ALL.ALL
* * * PRE SB   72-0401
(6)Axial scratches with corrosion pits on the area G2. Refer to Figure 803 and Figure 806:
Maximum serviceable limit:
Not serviceable.
NOTE:
Deleted.
Repair method:
Repair. Refer to TASK 72-58-40-300-807 (72-58-40, REPAIR 007).
Repair method:
Rework. Refer to SB 72-0401.
* * * END PRE SB   72-0401
Subtask 72-58-40-220-146
* * * FOR ALL.ALL
* * * SB   72-0401
(6).A.Axial scratches with corrosion pits on the area G2. Refer to Figure 803 and Figure 806:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
* * * END SB   72-0401
Subtask 72-58-40-220-049
P.Do an inspection of the ID surface under the spline (area B2) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-050
(2)Nicks, dents, or scratches:
Maximum serviceable limit:
•
Any amount, 0.004 inch (0.10 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Swab etching, FPI, and shot peen operations after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), are not necessary
•
After blending, do an MPI of the blended area. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-051
* * * PRE SB   72-0401
(3)Corrosion pit on the area B2 that does not include the area G1:
Maximum serviceable limit:
Not serviceable.
NOTE:
Deleted.
Repair method:
Repair. Refer to TASK 72-58-40-300-807 (72-58-40, REPAIR 007).
* * * END PRE SB   72-0401
Subtask 72-58-40-220-151
* * * FOR ALL.ALL
* * * SB   72-0401
(3).A.Corrosion pit on the area B2 that does not include the area G1:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
* * * END SB   72-0401
Subtask 72-58-40-220-152
* * * FOR ALL.ALL
* * * PRE SB   72-0401
(4)Corrosion pit on the area G1:
Maximum serviceable limit:
Not serviceable.
NOTE:
Deleted.
Repair method:
Repair. Refer to TASK 72-58-40-300-807 (72-58-40, REPAIR 007).
Repair method:
Rework. Refer to SB 72-0401.
* * * END PRE SB   72-0401
Subtask 72-58-40-220-153
* * * FOR ALL.ALL
* * * SB   72-0401
(4).A.Corrosion pit on the area G1:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
* * * END SB   72-0401
Subtask 72-58-40-220-097
P.A.Do an inspection of the ID surface under the spline (area B1) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-098
(2)Nicks, dents, or scratches:
Maximum serviceable limit:
•
Any amount, 0.004 inch (0.10 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Swab etching, FPI, and shot peen operations after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), are not necessary
•
After blending, do an MPI of the blended area. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Repair. Refer to TASK 72-58-40-300-806 (72-58-40, REPAIR 009).
Subtask 72-58-40-220-099
(3)Corrosion pit:
Maximum serviceable limit:
Not serviceable.
NOTE:
Deleted.
Repair method:
Repair. Refer to TASK 72-58-40-300-807 (72-58-40, REPAIR 007) or TASK 72-58-40-300-806 (72-58-40, REPAIR 009) .
Subtask 72-58-40-220-052
Q.Do an inspection of the center vent duct mating surface (surface EQ) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-053
CAUTION:
SWAB ETCHING, FPI, AND SHOTPEENING ARE NOT NECESSARY AFTER THE BLENDING PROCEDURE, SPECIFIED IN TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES). DAMAGE TO THE THERMAL SPRAY COATING CAN OCCUR.
(2)Nicks, dents, or scratches:
Maximum serviceable limit:
•
Any amount, 0.005 inch (0.13 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
NOTE:
If the damaged area does not have thermal spray coating, then swab etching, FPI, and shotpeening are not necessary after the blending procedure.
Repair method:
Repair the mid fan shaft. Refer to TASK 72-58-40-300-808 (72-58-40, REPAIR 010).
Subtask 72-58-40-220-054
(3)Contact mark:
Maximum serviceable limit:
Any amount, if there is no depth.
Repair method:
Repair the mid fan shaft. Refer to TASK 72-58-40-300-808 (72-58-40, REPAIR 010).
Subtask 72-58-40-220-055
(4)Fretting or corrosion pits:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair the mid fan shaft. Refer to TASK 72-58-40-300-808 (72-58-40, REPAIR 010).
Subtask 72-58-40-220-116
Q.A.Do an inspection of the center vent duct mating surface (diameter EP) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-117
CAUTION:
SWAB ETCHING, FPI, AND SHOTPEENING ARE NOT NECESSARY AFTER THE BLENDING PROCEDURE, SPECIFIED IN TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES). DAMAGE TO THE THERMAL SPRAY COATING CAN OCCUR.
(2)Nicks, dents, or scratches on diameter EP:
Maximum serviceable limit:
•
Any amount, 0.005 inch (0.12 mm) in depth, after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
NOTE:
If the damaged area does not have thermal spray coating, then swab etching, FPI, and shotpeening are not necessary after the blending procedure.
Repair method:
Repair the mid fan shaft. Refer to TASK 72-58-40-300-808 (72-58-40, REPAIR 010).
Subtask 72-58-40-220-118
(3)Contact mark:
Maximum serviceable limit:
Any amount, if there is no depth.
Repair method:
Repair the mid fan shaft. Refer to TASK 72-58-40-300-808 (72-58-40, REPAIR 010).
Subtask 72-58-40-220-119
(4)Fretting or corrosion pits:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair the mid fan shaft. Refer to TASK 72-58-40-300-808 (72-58-40, REPAIR 010).
Subtask 72-58-40-220-056
R.Deleted.
(1)Deleted.
Subtask 72-58-40-220-057
(2)Deleted.
Subtask 72-58-40-220-100
(3)Deleted.
Subtask 72-58-40-220-101
S.Do an inspection of the OD surface (area F) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-102
(2)Nicks and dents on area F but not in area F3:
Maximum serviceable limit:
•
Any amount, 0.002 inch (0.05 mm) in depth, after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Repair. Refer to TASK 72-58-40-300-806 (72-58-40, REPAIR 009).
Subtask 72-58-40-220-159
(3)Nicks and dents on area F3:
Maximum serviceable limit:
• Any amount, 0.002 inch (0.05 mm) in depth, after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
• For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
• The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) , is not necessary
• Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-147
* * * FOR ALL.ALL
(4)Scratches on area F but not in area F3:
Maximum serviceable limit:
•
Any amount, 0.001 inch (0.025 mm) in depth, after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
•
For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.).
•
The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), is not necessary.
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Repair. Refer to TASK 72-58-40-300-806 (72-58-40, REPAIR 009).
Subtask 72-58-40-220-160
(5)Scratches on area F3:
Maximum serviceable limit:
• Any amount, 0.001 inch (0.02 mm) in depth, after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
• For swab etching and FPI, use Class C etchant for the swab etching procedure and Class D spot fluorescent penetrant for the fluorescent penetrant inspection. MPI can be used as an alternative to the swab etching and FPI. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
• The shot peen operation after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) , is not necessary
• Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-103
(6)Corrosion pit on area F1 that does not include all fillet radii:
Maximum serviceable limit:
Not serviceable.
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-161
(7)Corrosion pit on area F2 and area F3 that does not include all fillet radii:
Maximum serviceable limit:
Not serviceable.
Repair method:
Shot peen the shaft damaged area. Refer to TASK 72-58-40-300-811 (72-58-40, REPAIR 014).
Subtask 72-58-40-220-162
(8)Corrosion pit on all fillet radii of the OD surface (area F):
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-154
* * * FOR ALL.ALL
T.Deleted.
(1)Deleted.
Subtask 72-58-40-220-155
(2)Deleted.
Subtask 72-58-40-220-156
* * * FOR ALL.ALL
(3)Deleted.
Subtask 72-58-40-220-058
U.Do an inspection of any other area for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-059
(2)Nicks, dents, or scratches:
Maximum serviceable limit:
•
Any amount, 0.004 inch (0.10 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Swab etching, FPI, and shot peen operations after the blending procedure, specified in TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), are not necessary
•
After blending, do an MPI of the blended area. Refer to Subtask 72-58-40-240-001 (paragraph 3.A.)
•
Shot peen, refer to the Post-Inspection Procedure, specified in Subtask 72-58-40-220-062 (paragraph 7.A.).
Repair method:
Replace the mid fan shaft.
Subtask 72-58-40-220-079
V.Do an inspection of the shank nut on the seal air flange for:
(1)Loss of the self-locking quality:
Maximum serviceable limit:
Any amount, if the breakaway torque is in the limit of TASK 70-51-00-400-004 (TIGHTENING PRACTICES AND TORQUE VALUES) . (Thread size 0.250-28 UNJF).
Repair method:
Repair. Refer to TASK 72-58-40-300-802 (72-58-40, REPAIR 004).
Subtask 72-58-40-220-080
(2)Damaged threads:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-58-40-300-802 (72-58-40, REPAIR 004).
Subtask 72-58-40-220-081
(3)Loose nut:
Maximum serviceable limit:
Rotation of the nut up to the trap is permitted but axial or radial movement of the nut is not permitted.
Maximum repairable limit:
Any amount.
Repair method:
Flare the nut. Refer to TASK 70-48-13-350-024 (SHANK NUT REPAIR).
Subtask 72-58-40-220-082
(4)Cracks in the shank:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-58-40-300-802 (72-58-40, REPAIR 004).
Subtask 72-58-40-220-083
(5)Missing shank nut:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-58-40-300-802 (72-58-40, REPAIR 004).
Subtask 72-58-40-220-084
(6)Dry film lubricant missing on the thread of the shank nut:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Repair. Refer to TASK 70-43-09-640-001 (REPLACEMENT OF DRY-FILM LUBRICANT) .
5 . Dimensional Inspection
Subtask 72-58-40-220-129
A.Do an inspection of the mounting flange boltholes for:
(1)Inner diameter of the boltholes:
Minimum serviceable limit:
0.7000 inch (17.780 mm).
Maximum serviceable limit:
0.7145 inch (18.150 mm).
6 . Special Dimensional Inspection.
Refer to Figure 804.
Subtask 72-58-40-220-060
A.Do an inspection of the mid fan shaft for twist as follows:
NOTE:
Measure the mid fan shaft twist when there is an N1 system over-torque condition or a fan seizure condition.
(1)Find the datum slot of the forward tang and datum bolthole of the mount flange. The datum slot and datum bolthole are identified by “T” mark on the adjacent area.
(a)Determine datum H as a plane in the center of the datum slot of the forward tang.
(b)Determine datum J as a plane in the center of the datum bolthole of the mount flange.
(2)Measure the phase angle between datum H and J.
* * * FOR ALL
Figure 804   Mid Fan Shaft Special Dimensional Inspection
Subtask 72-58-40-220-061
(3)Mid fan shaft angle of twist:
Minimum serviceable limit:
Maximum serviceable limit:
0.26 degrees.
Repair method:
Replace the mid fan shaft.
7 . Post-Inspection Procedure.
Refer to Figure 805.
Subtask 72-58-40-220-062
CAUTION:
APPLY APPLICABLE ANTICORROSIVE TO THE BARE SURFACE OF THE MID FAN SHAFT, IF THE MID FAN SHAFT IS NOT WORKED WITHIN 23 HOURS.
A.Shotpeen or rotary flap peen the mid fan shaft where the blend procedures have an effect.
(1)Deleted.
Subtask 72-58-40-380-014
(2)Alternative Procedure Available. Peen the shaft repaired areas. Refer to TASK 70-47-01-380-016 (SHOTPEENING) and as follows:
(a)Mask around the area you will shotpeen with C10-021   plastic tape. Overspray is permitted but not on area BA and the shank nuts.
(b)Use C04-271  S170 cast steel shot.
(c)Use an intensity of 0.010-0.015A.
(d)A minimum of 100 percent coverage, including fade out to adjacent peened surfaces, is necessary.
Subtask 72-58-40-380-015
(2).A.Alternative Procedure. Peen the shaft repaired areas. Refer to TASK 70-47-04-380-019 (ROTARY FLAP PEENING) and as follows:
(a)Mask around the area you will shotpeen with C10-021   plastic tape. Overspray is permitted but not on area BA and the shank nuts.
(b)The maximum flapper shot size must be S330 or equivalent.
(c)Use an intensity of 0.010-0.015A.
(d)A minimum of 100 percent coverage, including fade out to adjacent peened surfaces, is necessary.
Subtask 72-58-40-350-037
(3)Remove all the masking.
(4)Deleted.
* * * FOR ALL
Figure 805   (Sheet 1 ) Fan Shaft - Dimensional Inspection
* * * FOR ALL
* * * PRE SB   72-0040
Figure 805   (Sheet 2 ) Mid Fan Shaft - Dimensional Inspection
* * * FOR ALL
* * * SB   72-0040
Figure 805   (Sheet 3 ) Mid Fan Shaft - Dimensional Inspection
* * * FOR ALL
* * * PRE SB   72-0040
Figure 805   (Sheet 4 ) Mid Fan Shaft - Dimensional Inspection
* * * FOR ALL
* * * SB   72-0040
Figure 805   (Sheet 5 ) Mid Fan Shaft - Dimensional Inspection
Subtask 72-58-40-220-063
* * * PRE SB   72-0300
B.Apply the aluminum protective paint to the mid fan shaft. Refer to TASK 72-58-40-300-803 (72-58-40, REPAIR 002).
* * * END PRE SB   72-0300
Subtask 72-58-40-350-054
* * * SB   72-0300
B.A.Apply the aluminum protective paint and the seal coat to the mid fan shaft. Refer to TASK 72-58-40-300-812 (72-58-40, REPAIR 013).
* * * END SB   72-0300
Subtask 72-58-40-220-064
C.Apply solid film lubricant to the mid fan shaft. Refer to TASK 72-58-40-300-804 (72-58-40, REPAIR 003).
Subtask 72-58-40-300-003
D.If the position of the balance weight was not recorded at disassembly or is in doubt, do the balance inspection. Refer to TASK 72-58-40-300-801 (72-58-40, REPAIR 001).
Subtask 72-58-40-350-055
E.Install the shank nuts. Refer to TASK 72-58-40-300-802 (72-58-40, REPAIR 004).
Subtask 72-58-40-220-066
F.Alternative Procedure Available. Apply C02-059  Oil to the surface where lubricant or coating are not applied.
Subtask 72-58-40-220-109
F.A.Alternative Procedure. Apply preservation oil to the surface where lubricant or coating are not applied. Refer to TASK 72-58-00-550-801 (72-58-00, STORAGE 001).
* * * FOR ALL
Figure 806   (Sheet 1 ) Mid Fan Shaft - Typical Scratches with Corrosion at 15X Magnification
* * * FOR ALL
Figure 806   (Sheet 2 ) Mid Fan Shaft - Typical Scratches with Corrosion at 15X Magnification
* * * FOR ALL
Figure 806   (Sheet 3 ) Mid Fan Shaft - Typical Scratches with Corrosion at 15X Magnification