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TASK 72-31-41-300-802
1 . General Blend Repair.
A.This procedure gives instructions to repair the high pressure compressor stage 1 blisk (blisk) by blending the seal teeth. Refer to Figure 901.
B.The following maximum repairable limits apply to this repair:
NOTE:
The information below gives maximum repairable limits for the applicable Inspection sections. The paragraphs are numbered the same as the manual Inspection sections.
NOTE:
For 72-31-41, Inspection 001. Refer to TASK 72-31-41-200-801 (72-31-41, INSPECTION 001) .
(5)Visual Inspection.
(f)Do an inspection of the flowpath surface of the blisk (does not include root fillet) for:
1Nicks, dents, pits (if not corrosion related), and scratches:
Maximum Repairable Limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.0650 inch (1.651 mm) if they are in the repair areas. Refer to Figure 902.
(i)Do an inspection of the flange for:
2Nicks, dents, pits (if not corrosion related), and scratches on bolt pads:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.0650 inch (1.651 mm) only for areas that are not in 0.020 inch (0.51 mm) of the bolthole edge radius.
4Nicks, dents, pits (if not corrosion related), and scratches on diameter AY:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.0650 inch (1.651 mm).
5Nicks, dents, pits (if not corrosion related), and scratches on surface AX:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.0650 inch (1.651 mm) only for areas that are not in 0.020 inch (0.51 mm) of the bolthole edge radius.
(k)Do an inspection of the aft flange scallop (8 locations) for:
1Nicks, dents, pits (if not corrosion related), or scratches on the scallop surface:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.0650 inch (1.651 mm).
2Nicks, dents, pits (if not corrosion related), or scratches on the scallop chamfers (forward and aft sides):
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.0650 inch (1.651 mm).
(l)Do an inspection of the disk bore, hub faces, and web for:
1Nicks, dents, pits (if not corrosion related), or scratches on the disk bore:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.500 inch (12.70 mm).
2Nicks, dents, pits (if not corrosion related), or scratches on hub faces:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.100 inch (2.54 mm).
3Nicks, dents, pits (if not corrosion related), or scratches on webs and web transitions:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.100 inch (2.54 mm).
(m)Do an inspection of the damper interface for:
1Nicks, dents, pits (if not corrosion related), or scratches:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.0650 inch (1.651 mm).
(n)Do an inspection of the seal teeth for:
1Nicks, dents, pits (if not corrosion related), or scratches:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.050 inch (1.27 mm) and if it agrees with the conditions that follow:
•
The maximum total collected length of all blends on each tooth cannot be more than 3.0 inches (76 mm).
•
The total collected length of all blends on all teeth cannot be more than 6.0 inches (152 mm).
•
The minimum space between blends cannot be less than 1.0 inch (26 mm).
•
The blends on a stage of seal teeth must not align axially across more than two seal teeth in a row.
•
The blend radius must be 1.5 inches (39 mm) minimum.
(o)Do an inspection of the aft flange ID fillet for:
1Marks, nicks, dents, and scratches:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.0650 inch (1.651 mm).
(p)Do an inspection of all other areas on the disk portion of the part (does not include airfoils or flowpath) for:
1Nicks, dents, pits (if not corrosion related), or scratches:
Maximum Repairable limit:
Any amount, if 1.25 times the damage depth can be removed with a maximum blend depth of 0.005 inch (0.12 mm) and a minimum blend radius of 0.100 inch (2.54 mm).
C.The subsequent table gives a list of the part numbers that are applicable to this repair. All part numbers are applicable to all paragraphs unless specified differently.
 
Part Number(s)
 
2448M41P01  
2445M81P01  
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D.Proprietary/Complex Process Statement.
(1)None.
2 . Tools, Equipment, and Materials.
NOTE:
Repair sources can use equivalent alternatives for tools, equipment, and consumable materials, however, the repair source must demonstrate and document equivalency.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C04-166
Shot, Peening, Conditioned Cut Wire (CCW14 steel shot)
 
C10-010
Abrasive Cloth
 
C10-205
Almen Test Strips
C.Referenced Procedures.
 
ATA No.
Description
 
70-21-00
Chemical Cleaning
 
70-21-03
Cleaning Method No. 3 - Steam Cleaning
 
70-24-00
Etching Procedures for Fluorescent-Penetrant Inspection
 
70-24-01
Swab Etching Procedure
 
70-32-00
Indirect Inspection Methods
 
70-32-02
Fluorescent Penetrant Inspection
 
70-32-03
Spot-Fluorescent-Penetrant Inspection
 
70-42-00
Blending and Removal of High Metal Procedures
 
70-47-01
Shotpeening
 
72-31-41
Inspection 001
D.Expendable Parts. None.
E.SPD Information.
(1)Locally Manufactured SPD. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-31-41-220-079
A.Refer to Figure 901, Figure 902, and Figure 903 for specified dimensions and locations.
NOTE:
The dimensional data identified within this procedure was designed using inches as the base unit of measurement for dimensional values. The conversion to millimeters is rounded to one less decimal digit than inches. For minimum dimensions, converted values are rounded up. For maximum dimensions, converted values are rounded down. To avoid conversion errors, do not re-convert from millimeters to inches.
NOTE:
Reference dimensions do not require inspection.
4 . Setup Information.
None.
5 . Procedure.
Subtask 72-31-41-160-003
A.If necessary, clean the blisk. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING) and TASK 70-21-03-160-001 (CLEANING METHOD NO. 3 - STEAM CLEANING).
Subtask 72-31-41-220-074
B.Do a visual inspection of the blisk. Refer to TASK 72-31-41-200-801 (72-31-41, INSPECTION 001).
Subtask 72-31-41-350-003
C.Blend the blisk damaged areas. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), Figure 901, Figure 902, and as follows:
(1)Make sure that you blend only the permitted blisk areas, refer to TASK 72-31-41-200-801 (72-31-41, INSPECTION 001).
(2)Deleted.
Subtask 72-31-41-160-004
D.Clean the blisk blended areas. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING) and TASK 70-21-03-160-001 (CLEANING METHOD NO. 3 - STEAM CLEANING).
Subtask 72-31-41-110-005
E.Etch the blisk blended areas. Refer to TASK 70-24-00-110-033 (ETCHING PROCEDURES FOR FLUORESCENT-PENETRANT INSPECTION) , TASK 70-24-01-110-034 (SWAB ETCHING PROCEDURE) , and as follows:
(1)Use Class B etchant.
Subtask 72-31-41-230-004
F.Alternative Procedure Available. Do an inspection of the blisk blended areas. Refer to TASK 70-32-00-200-002 (INDIRECT INSPECTION METHODS), TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION), and as follows:
(1)Use Class G penetrant.
(2)Indications more than 0.015 inch (0.38 mm) are not permitted.
(3)Linear indications are not permitted.
NOTE:
Linear indications are indications that are at least three times longer than they are wide.
(4)Indications which cross corners are not permitted.
Subtask 72-31-41-230-005
F.A.Alternative Procedure. Do an inspection of the blisk blended areas. Refer to TASK 70-32-00-200-002 (INDIRECT INSPECTION METHODS), TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION), and as follows:
(1)Use Class G penetrant.
(2)Indications more than 0.015 inch (0.38 mm) are not permitted.
(3)Linear indications are not permitted.
NOTE:
Linear indications are indications that are at least three times longer than they are wide.
(4)Indications which cross corners are not permitted.
Subtask 72-31-41-140-001
WARNING:
USE EYE PROTECTION WHEN YOU POLISH MATERIAL OR PARTS. THE PARTICLES CAN CAUSE AN INJURY TO YOUR EYES. USE IN A WELL-VENTILATED AREA.
G.Polish the blisk to remove the effects of the etching procedure as follows:
(1)Use C10-010  abrasive cloth.
Subtask 72-31-41-380-002
H.Peen the blisk repair areas. Refer to TASK 70-47-01-380-016 (SHOTPEENING), Figure 901, Figure 903, and as follows:
(1)Use C04-166  CCW14 steel shot.
(2)Peen the blisk to an intensity of 0.006-0.012N.
(3)Ricochet peening is permitted in the blisk areas BG.
(4)Coverage must be a minimum of 125 percent.
(5)Overspray is not permitted in the blisk area BD.
(6)Do an inspection of the intensity in all the blisk repaired areas with C10-205  Almen test strips and an Almen test strip holder.
Subtask 72-31-41-160-005
I.Clean the blisk repaired areas. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING) and TASK 70-21-03-160-001 (CLEANING METHOD NO. 3 - STEAM CLEANING).
Subtask 72-31-41-220-075
J.Do a visual inspection of the blisk repair areas. Refer to TASK 72-31-41-200-801 (72-31-41, INSPECTION 001).
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Figure 901   (Sheet 1 ) High Pressure Compressor Stage 1 Blisk
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Figure 901   (Sheet 2 ) High Pressure Compressor Stage 1 Blisk
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Figure 901   (Sheet 3 ) High Pressure Compressor Stage 1 Blisk
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Figure 902   High Pressure Compressor Stage 1 Blisk - Dimensional Information
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Figure 903   (Sheet 1 ) High Pressure Compressor Stage 1 Blisk - Shotpeening Areas
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Figure 903   (Sheet 2 ) High Pressure Compressor Stage 1 Blisk - Shotpeening Areas