* * * FOR ALL
TASK 72-56-46-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the low pressure turbine stage 7 disk (disk).
  •
(10-200 , 72-56-00) (SIN 930B7)
  •
(10A-200 , 72-56-00) (SIN 930B7) (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. None.
C.Referenced Procedures.
 
ATA No.
Description
 
70-32-02
Fluorescent Penetrant Inspection
 
70-34-04
Portable Rockwell Hardness Testing
 
70-42-00
Blending and Removal of High Metal Procedures
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 72-56-46-230-001
A.Do a Class G fluorescent penetrant inspection of the disks. Refer to TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION) and as follows. Refer to Figure 801.
(1)Through indications are not permitted.
(2)Linear indications are not permitted.
NOTE:
Linear indications are indications that are three times or more in length than they are in width.
(3)Indications that cross into corners are not permitted.
(4)Indications are not permitted in the areas that follow:
(a)Indications in boltholes or 0.25 inch (6.40 mm) or less from the boltholes.
(b)Indications in fillets or 0.25 inch (6.40 mm) or less from the fillet.
(5)Indications that are less than 0.020 inch (0.51 mm) in length are permitted if they are 0.060 inch (1.52 mm) or more apart.
(6)Indications that are less than 0.030 inch (0.76 mm) in length are permitted if they are 0.750 inch (19.05 mm) or more apart.
4 . Visual Inspection.
Subtask 72-56-46-220-001
A.Do an inspection of the mount flanges for. Refer to Figure 801.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-002
(2)Nicks, and scratches:
Maximum serviceable limit:
Any amount, 0.002 inch (0.05 mm) in depth after the removal of high metal. No sharp grooves. Damage is not permitted in line with the boltholes or across the flange corner. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-060
(3)Dents:
Maximum serviceable limit:
Any amount, 0.003 inch (0.08 mm) in depth after the removal of high metal. No sharp grooves. Damage is not permitted in line with the boltholes or across the flange corner. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-003
(4)Nicks, dents, and scratches on the outside diameter (OD) at the corner:
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) .
Repair method:
Replace the disk.
Subtask 72-56-46-220-004
(5)Nicks, dents, and scratches on fillet R of scalloping in the forward flange:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-005
(6)Burnishing/contact mark around the bolthole:
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 disk.
* * * FOR ALL
* * * PRE SB   72-0040
Figure 801   (Sheet 1 ) Stage 7 Disks - Inspection
* * * FOR ALL
* * * SB   72-0040
Figure 801   (Sheet 2 ) Stage 7 Disks - Inspection
* * * FOR ALL
Figure 801   (Sheet 3 ) Stage 7 Disks - Inspection
* * * FOR ALL
Figure 801   (Sheet 4 ) Stage 7 Disks - Inspection
Subtask 72-56-46-220-006
B.Do an inspection of the inside diameter (ID) side of the boltholes including the chamfer for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-007
(2)Nicks, dents, and scratches:
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) .
Maximum repairable limit:
Any amount, if the bolthole dimension is less than 0.2662 inch (6.761 mm) after the repair. Maximum eight oversize boltholes are permitted, provided if the bolthole dimension is less than 0.2692 inch (6.837 mm) and there are no more than two oversize boltholes in any series of six boltholes.
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-061
(3)Burnishing/contact marks:
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) .
Repair method:
Replace the disk.
Subtask 72-56-46-220-008
C.Do an inspection of the OD side of the boltholes including the chamfer for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-009
(2)Nicks, dents, or scratches:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, if the bolthole dimension is less than 0.2662 inch (6.761 mm) after the repair. Maximum eight oversize boltholes are permitted, provided if the bolthole dimension is less than 0.2692 inch (6.837 mm) and there are no more than two oversize boltholes in any series of six boltholes.
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-010
D.Do an inspection of the interstage seal inward rabbet for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-011
(2)Deformed/bent:
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) .
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth.
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-012
(3)Wear:
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) .
Repair method:
Replace the disk.
Subtask 72-56-46-220-062
E.Do an inspection of the disk OD at the axial stopper for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-063
(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) .
Maximum repairable limit:
Any amount 0.030 inch (0.76 mm) in depth.
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-064
(3)Fretting:
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 disk.
Subtask 72-56-46-220-065
(4)Missing material, smeared or rolled:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-017
F.Do an inspection of area S of the dovetail serrations for (does not include the front and rear edge of the blade slot):
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-018
(2)Fretting:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth after the removal of high metal, if on less than 40 percent of the pressure face. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the disk.
Subtask 72-56-46-220-019
(3)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth after the removal of high metal, if on less than 40 percent of the pressure face. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the disk.
Subtask 72-56-46-220-020
G.Do an inspection of the front and rear edge of the blade slot in area S of the dovetail serrations for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-021
(2)Dents, nicks, scratches, and sharp edges:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Round the edge of the slot to remove the damage to a 0.015-0.040 inch (0.38-1.02 mm) radius and keep a 32 microinch (0.8 micrometer) finish. A true edge radius of the slot is not necessary.
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-022
H.Do an inspection of area T of the dovetail serrations (does not include the front and rear edge of the blade slot) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-023
(2)Fretting:
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 disk.
Subtask 72-56-46-220-024
(3)Nicks, dents and scratches:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Three for each serration with a maximum length of 0.03 inch (0.76 mm) and 0.250 inch (6.35 mm) apart, if the damage area can be removed by a blend to a maximum depth of 0.020 inch (0.51 mm) from the initial contour.
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-026
I.Do an inspection of the front and rear edge of the blade slot in area T of the dovetail serrations for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-027
(2)Dents, nicks, scratches, and sharp edges:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Round the edge of the slot to remove the damage to a 0.015-0.040 inch (0.38-1.02 mm) radius and keep a 32 microinch (0.8 micrometer) finish. A true edge radius of the slot is not necessary.
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-028
J.Do an inspection of the axial stopper of area T of the dovetail serration for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-029
(2)Fretting:
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) .
Repair method:
Replace the disk.
Subtask 72-56-46-220-030
(3)Nicks, and scratches:
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) .
Maximum repairable limit:
Any amount 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-031
(4)Dents:
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) .
Maximum repairable limit:
Any amount 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-032
(5)Missing material, smeared or rolled:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-033
(6)Deformed/Bent:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-034
K.Do an inspection of area U of the dovetail serrations (does not include the front and rear edge of the blade slot) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-035
* * * PRE SB   72-0040
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
* * * END PRE SB   72-0040
Subtask 72-56-46-220-066
* * * SB   72-0040
(3)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
* * * END SB   72-0040
Subtask 72-56-46-220-036
L.Do an inspection of the front and the rear edge of the blade slot in area U of the dovetail serration for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-037
(2)Nicks, dents, scratches, and sharp edges:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Round the edge of the slot to remove the damage to a 0.015-0.040 inch (0.38-1.02 mm) radius and keep a 32 microinch (0.8 micrometer) finish. A true edge radius of the slot is not necessary.
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-040
M.Do an inspection of the bore for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-041
(2)Nicks, and scratches:
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) .
Repair method:
Replace the disk.
Subtask 72-56-46-220-067
(3)Dents:
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) .
Repair method:
Replace the disk.
Subtask 72-56-46-220-068
N.Do an inspection of the hub for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-069
* * * PRE SB   72-0040
(2)Nicks, and scratches:
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) .
Maximum repairable limit:
Any amount 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
* * * END PRE SB   72-0040
Subtask 72-56-46-220-070
* * * SB   72-0040
(2).A.Nicks, and scratches:
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) .
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.5 inch (12.7 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
* * * END SB   72-0040
Subtask 72-56-46-220-071
* * * PRE SB   72-0040
(3)Dents:
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) .
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
* * * END PRE SB   72-0040
Subtask 72-56-46-220-072
* * * SB   72-0040
(3).A.Dents:
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) .
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.5 inch (12.7 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
* * * END SB   72-0040
Subtask 72-56-46-220-073
O.Do an inspection of the web for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-074
(2)Nicks, and scratches:
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) .
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-075
(3)Dents:
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) .
Maximum repairable limit:
Any amount 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-044
P.Do an inspection of all other areas for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-56-46-220-045
(2)Nicks, and scratches:
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) .
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-56-46-220-046
(3)Dents:
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) .
Maximum repairable limit:
Any amount 0.005 inch (0.13 mm) in depth, if the damage can be removed with the blend radius more than 0.25 inch (6.4 mm).
Repair method:
Blend the damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
5 . Hardness Check and Growth on Diameter AK and Diameter AN of the Low Pressure Turbine Stage 7 Disks.
NOTE:
This inspection applies only to parts that were subjected to an over temp or an over speed condition.
Subtask 72-56-46-220-047
A.Do a measurement and make a record of the disk hardness in locations as follows. Use a modified or unmodified Ames Portable Hardness Tester, Model No. 2 with a sphero-conical diamond penetrator and a 60 kilogram load. Refer to TASK 70-34-04-220-010 (PORTABLE ROCKWELL HARDNESS TESTING). Refer to Figure 802.
NOTE:
Scales should be set to limit the penetration depth to 0.006 inch (0.15 mm) maximum. The hardness check must not be taken in the same location as checks that came before.
(1)Measure the disk rim hardness at two locations approximately 0.125 inch (3.18 mm) apart and at least 0.050 inch (1.27 mm) from corners. Measure hardness on the aft side of the rim.
* * * FOR ALL
* * * PRE SB   72-0040
Figure 802   (Sheet 1 ) Stage 7 Disk - Hardness Check and Growth Inspection
* * * FOR ALL
* * * SB   72-0040
Figure 802   (Sheet 2 ) Stage 7 Disk - Hardness Check and Growth Inspection
Subtask 72-56-46-220-048
B.Do a measurement and make a record of the growth of the diameters AK and AN.
Subtask 72-56-46-220-049
C.Determine:
(1)Hardness at area V:
Maximum serviceable limit:
Minimum RA69.
Repair method:
Replace the disk.
Subtask 72-56-46-220-050
(2)Growth on diameter AK (bore ID):
Maximum serviceable limit:
As marked on area AQ of the part plus 0.018 inch (0.45 mm).
Repair method:
Replace the disk.
Subtask 72-56-46-220-051
(3)Growth on diameter AN (post OD):
Maximum serviceable limit:
As marked on area AQ of the part plus 0.021 inch (0.53 mm).
Repair method:
Replace the disk.
Subtask 72-56-46-350-001
D.Blend to remove the surface indentations generated from hardness checks. Blend the indentation to a maximum depth of 0.010 inch (0.25 mm) from the initial contour. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES). Power blending is permitted if unwanted local heat build-up is prevented and the blend is smooth.
6 . Dimensional Inspection.
Do a dimensional inspection of the areas that follow. Measure the dimension J at the forward and aft locations along each dovetail slot at eight equally-spaced positions on the circumference. Put the wires approximately one-third into the length of the dovetail slot for the forward and aft dimensional inspections. Refer to Figure 801.
Subtask 72-56-46-220-076
* * * PRE SB   72-0040
A.Dimension J
Minimum serviceable limit:
0.0555 inches (1.409 mm).
Maximum serviceable limit:
0.0650 inches (1.651 mm).
Repair method:
Replace the disk.
* * * END PRE SB   72-0040
Subtask 72-56-46-220-077
* * * SB   72-0040
A.A.Dimension J
Minimum serviceable limit:
0.1837 inches (4.667 mm).
Maximum serviceable limit:
0.1926 inches (4.893 mm).
Repair method:
Replace the disk.
* * * END SB   72-0040