* * * FOR ALL
TASK 72-56-47-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the low pressure turbine (LPT) cone shaft assembly (LPT cone shaft) (01-050 , 72-56-00) (SIN 930D1).
2 . Tools, Equipment, and Materials.
NOTE:
You can use equivalent alternatives for tools, equipment, and consumable materials.
A.Tools and Equipment.
(1)Special Tools.
 
Tool No.
Description
 
11C4202G01
Restraining Fixture, LPT Cone Shaft (restraining fixture)
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C10-021
Tape, Duct
C.Referenced Procedures.
 
ATA No.
Description
 
70-21-05
Wet Abrasive Blast Cleaning
 
70-32-02
Fluorescent Penetrant Inspection
 
70-34-04
Portable Rockwell Hardness Testing
 
70-42-00
Blending And Removal Of High Metal Procedures
 
70-43-09
Replacement Of Dry-Film Lubricant
 
70-47-01
Shotpeening
 
70-48-13
Shank Nut Repair
 
70-51-00
Tightening Practices And Torque Values
D.Expendable Parts. None.
3 . Specific Inspection Procedure.
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.
Subtask 72-56-47-230-001
A.Do a Class G fluorescent penetrant inspection of the LPT cone shaft. Refer to TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION).
(1)Through indications are not permitted.
(2)Linear indications are not permitted.
NOTE:
Linear indications are indications that are three times longer than they are wide.
(3)Indications that cross into corners are not permitted.
(4)Indications are not permitted in the following areas:
(a)Boltholes or within 0.25 inch (6.4 mm) from the boltholes.
(b)Vent holes or within 0.25 inch (6.4 mm) from the vent holes.
(5)Indications that are less than 0.020 inch (0.51 mm) in length are permitted if they are separated by 0.060 inch (1.52 mm) or more.
(6)Indications that are less than 0.030 inch (0.76 mm) in length are permitted if they are separated by 0.750 inch (19.05 mm) or more.
4 . Visual Inspection.
Refer to Figure 801.
Subtask 72-56-47-220-001
A.Do an inspection of the cone body (except vent holes) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
* * * FOR ALL
Figure 801   (Sheet 1 ) LPT Cone Shaft Assembly - Inspection
* * * FOR ALL
Figure 801   (Sheet 2 ) LPT Cone Shaft Assembly - Inspection
* * * FOR ALL
Figure 801   (Sheet 3 ) LPT Cone Shaft Assembly - Inspection
Subtask 72-56-47-220-002
(2)Nicks and scratches:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-003
(3)Dents:
Maximum serviceable limit:
Any amount, 0.020 inch (0.51 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-004
B.Do an inspection of the vent holes for:
(1)Cracks:
Maximum serviceable limit:
Not Serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-005
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.004 inch (0.10 mm) from original contour.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-006
C.Do an inspection of the mounting flange (except boltholes) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-007
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
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. Minimum sealing face path after blending to 0.100 inch (2.54 mm).
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-008
(3)Fretting or galling:
Maximum serviceable limit:
Any amount of contact mark is permitted if there is no depth.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-009
D.Do an inspection of the mounting flange boltholes for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-010
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.0035 inch (0.089 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 LPT cone shaft.
Subtask 72-56-47-220-011
E.Do an inspection of the mid fan shaft flange (except boltholes) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-012
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
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. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-013
(3)Fretting or galling on the flange face:
Maximum serviceable limit:
Any amount of contact mark is permitted if there is no depth.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-014
(4)Fretting or galling on the rabbet OD:
Maximum serviceable limit:
Any amount, if diameter DA is in the dimensional inspection limit after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-015
F.Do an inspection of the mid fan shaft flange boltholes for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cones shaft.
Subtask 72-56-47-220-016
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-017
G.Do an inspection of the brush seal flange (including boltholes) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-018
(2)Nicks, dents, and scratches in the inner fillet area:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-019
(3)Nicks, dents, and scratches in the other areas:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour. Minimum sealing face path after blending to 0.100 inch (2.54 mm).
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-020
(4)Fretting or galling on the flange face:
Maximum serviceable limit:
Any amount, 0.002 inch (0.05 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-021
(5)Fretting or galling on the rabbet OD :
Maximum serviceable limit:
Any amount, if diameter DB is in the dimensional inspection limit after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-022
H.Do an inspection of the labyrinth seal flange (except shank nuts) for;
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-023
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour. Minimum sealing face path after blending to 0.100 inch (2.54 mm).
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-024
(3)Fretting or galling on the flange face:
Maximum serviceable limit:
Any amount, 0.002 inch (0.05 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-025
(4)Fretting or galling on the rabbet ID:
Maximum serviceable limit:
Any amount, if diameter DC is in the dimensional inspection limit after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-026
I.Do an inspection of the shank nuts for:
(1)Missing:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-56-47-300-801 (72-56-47, REPAIR 001).
Subtask 72-56-47-220-027
(2)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-56-47-300-801 (72-56-47, REPAIR 001).
Subtask 72-56-47-220-028
(3)Damaged threads:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-56-47-300-801 (72-56-47, REPAIR 001).
Subtask 72-56-47-220-029
(4)Self-locking feature:
Maximum serviceable limit:
Any amount, if in the limits of torque check for self-locking nuts. Refer to TASK 70-51-00-400-004 (TIGHTENING PRACTICES AND TORQUE VALUES). Thread size is 0.250-28 UNJF-3B.
Repair method:
Repair. Refer to TASK 72-56-47-300-801 (72-56-47, REPAIR 001).
Subtask 72-56-47-220-030
(5)Looseness:
Maximum serviceable limit:
Rotational movement is permitted, but axial or transverse movement is not permitted.
Repair method:
Repair. Refer to TASK 72-56-47-300-801 (72-56-47, REPAIR 001).
Subtask 72-56-47-220-031
J.Do an inspection of the oil scoop for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-032
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-033
K.Do an inspection of the No. 5 bearing inner seal journal for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-034
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.015 inch (0.38 mm) in depth if no more than 5 percent of surface is affected in any 90 degree sector, after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-035
(3)Fretting or galling:
Maximum serviceable limit:
Any amount, if diameter DD at damaged area is in the dimensional inspection limit after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-036
L.Do an inspection of the No. 5 bearing inner seal axial stopper surface for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-037
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-038
(3)Fretting or galling:
Maximum serviceable limit:
Any amount, 0.001 inch (0.03 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-039
M.Do an inspection of the No. 5 bearing journal for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-040
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.015 inch (0.38 mm) in depth if no more than 5 percent of surface is affected in any 90 degree sector, after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-041
(3)Fretting or galling:
Maximum serviceable limit:
Any amount, if diameter DE at damaged area is in the dimensional inspection limit after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-042
N.Do an inspection of the threads for:
(1)Damage:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Repairable if cumulative length of 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).
Subtask 72-56-47-220-043
O.Do an inspection of the end slots for:
(1)Cracks;
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-044
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.020 inch (0.51 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-045
P.Do an inspection of the carbon runner seal support ID for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-046
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-047
(3)Fretting or galling:
Maximum serviceable limit:
Any amount, 0.002 inch (0.05 mm) in depth if no more than 5 percent of surface is affected in any 90 degree sector, after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-048
Q.Do an inspection of the extension duct support ID for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-049
(2)Nicks, dents, and scratches;
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-050
(3)Fretting or galling:
Maximum serviceable limit:
Any amount, 0.002 inch (0.05 mm) in depth if no more than 5 percent of surface is affected in any 90 degree sector, after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-051
R.Do an inspection of the extension duct axial stopper surface for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-052
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-053
(3)Fretting or galling;
Maximum serviceable limit:
Any amount, 0.003 inch (0.08 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-054
S.Do an inspection of the extension duct antirotation slots for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-055
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-056
(3)Fretting or galling:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-56-47-220-057
T.Do an inspection of all other areas of aft journal area for;
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-058
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Maximum repairable limit:
Any amount, if damage can be removed by blending to a maximum depth of 0.020 inch (0.51 mm) from original contour.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
5 . Dimensional Inspection.
Refer to Figure 801.
Subtask 72-56-47-220-059
A.Restrain the LPT cone shaft for dimensional inspection of diameter DB (brush seal flange rabbet OD) and diameter DC (labyrinth seal flange rabbet ID).
(1)Alternative Procedure Available. Restrain the LPT cone shaft in the 11C4202   restraining fixture. Make sure that diameter DA is held round and that surface SA is held flat in the limits of 0.001 inch (0.03 mm) full indicator reading (FIR).
(1).A.Alternative Procedure. Restrain the LPT cone shaft with surface SA held flat to not more than 0.001 inch (0.03 mm).
Subtask 72-56-47-220-060
B.Do a dimensional inspection of the LPT cone shaft.
(1)Diameter DA (mid fan shaft flange rabbet OD):
(a)Do this dimensional inspection only if the visual inspection shows that it is necessary. Refer to Subtask 72-56-47-220-001 (paragraph 4.).
(b)Use the average of 10 equally spaced measurements to find the diameter.
Minimum serviceable limit:
13.6331 inches (346.280 mm).
Maximum serviceable limit:
13.6346 inches (346.320 mm).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-061
(2)Diameter DB (brush seal flange rabbet OD):
(a)Do this dimensional inspection only if the visual inspection shows that it is necessary. Refer to Subtask 72-56-47-220-001 (paragraph 4.).
(b)Use the average of 10 equally spaced measurements to find the diameter.
Minimum serviceable limit:
21.5636 inches (547.715 mm).
Maximum serviceable limit:
21.5656 inches (547.765 mm).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-062
(3)Diameter DC (labyrinth seal flange rabbet ID):
(a)Do this dimensional inspection only if the visual inspection shows that it is necessary. Refer to Subtask 72-56-47-220-001 (paragraph 4.).
(b)Use the average of 10 equally spaced measurements to find the diameter.
Minimum serviceable limit:
11.4872 inches (291.774 mm).
Maximum serviceable limit:
11.4906 inches (291.860 mm).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-063
(4)Diameter DD (No. 5 bearing inner seal journal):
(a)Do this dimensional inspection only if the visual inspection shows that it is necessary. Refer to Subtask 72-56-47-220-001 (paragraph 4.).
(b)Use the average of 10 equally spaced measurements to find the diameter.
Minimum serviceable limit:
6.2368 inches (158.415 mm).
Maximum serviceable limit:
6.2388 inches (158.465 mm).
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-220-064
(5)Diameter DE (No. 5 bearing journal):
(a)Do this dimensional inspection only if the visual inspection shows that it is necessary. Refer to Subtask 72-56-47-220-001 (paragraph 4.).
(b)Use the average of 10 equally spaced measurements to find the diameter.
Minimum serviceable limit:
6.18799 inches (157.1750 mm).
Maximum serviceable limit:
6.18839 inches (157.1850 mm).
Repair method:
Replace the LPT cone shaft.
6 . Hardness Inspection.
Refer to Figure 801.
NOTE:
This inspection is for an overtemperature or overspeed condition only. You must do this inspection as well as the regular inspection and all the dimensional inspections for the LPT cone shaft.
Subtask 72-56-47-280-001
A.Do the hardness inspection as follows:
(1)Set the scale to limit the penetration depth to 0.006 inch (0.15 mm) maximum.
(2)Measure the hardness at two locations 180 degrees apart in the same circumferential plane, midway between the boltholes on rear side of the mounting flange. Refer to TASK 70-34-04-220-010 (PORTABLE ROCKWELL HARDNESS TESTING).
Subtask 72-56-47-280-002
(3)Hardness:
Minimum serviceable limit:
Minimum HR C37.
Maximum serviceable limit:
Repair method:
Replace the LPT cone shaft.
Subtask 72-56-47-350-004
(4)Blend to remove the minimum material so that the surface indentations made by the hardness checks can be eliminated. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
7 . Post Inspection Procedures.
Refer to Figure 802.
Subtask 72-56-47-350-001
A.Shotpeen the LPT cone shaft where the blend procedures have an effect.
(1)If necessary, remove the shank nuts. Refer to TASK 70-48-13-350-024 (SHANK NUT REPAIR).
* * * FOR ALL
Figure 802  
Subtask 72-56-47-380-001
(2)Shotpeen the blended area.
(a)Mask around the area you will shotpeen with C10-021   Tape, Duct. Overspray is permitted except to area AA and the shank nuts.
Subtask 72-56-47-380-002
(b)Shotpeen the blended area. Use S-110 or S-130 cast steel shot to an intensity of 0.004A to 0.008A. Minimum of a 100 percent coverage is required. Refer to TASK 70-47-01-380-016 (SHOTPEENING).
Subtask 72-56-47-380-003
(3)If you shotpeen area AB, wet grit blast area AB.
(a)Mask all the area except area AB with C10-021  Tape, Duct. Overspray is permitted to area AC.
Subtask 72-56-47-120-001
(b)Wet grit blast area AB. Refer to TASK 70-21-05-120-B02 (Wet Abrasive Blast Cleaning Method 5B) with the following exceptions.
1Use 150-220 mesh aluminum oxide grit.
2Abrasive content in water must be maintained at 30-40 percent by volume.
3Maintain air pressure at 60-70 psi (414-483 kPa).
4Nozzle must be held at a distance of 3.0-5.0 inches (76-127 mm) from the part and a angle of 40-60 degrees with the surface being blasted.
Subtask 72-56-47-350-002
(4)Remove all the masking.
Subtask 72-56-47-350-003
(5)If removed before, install the shank nuts. Refer to TASK 70-48-13-350-024 (SHANK NUT REPAIR).
Subtask 72-56-47-640-001
B.Apply dry film lubricant to the threads of the shank nuts. Refer to TASK 70-43-09-640-001 (REPLACEMENT OF DRY-FILM LUBRICANT).