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TASK 72-53-43-300-804
1 . Blend Repair of the Seal.
A.This procedure gives instructions to repair the high pressure turbine rotor interstage seal (seal) by blending. 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 72-53-43, Inspection 001, refer to TASK 72-53-43-200-806 (72-53-43, INSPECTION 001, CONFIG 02) .
(4)Visual Inspection.
(d)Do an inspection of the seal bore, bore edge radius, and hub faces for:
1Scratches:
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.005 inch (0.12 mm) in depth with a minimum blend radius of 0.25 inch (6.4 mm).
2Nicks and dents:
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.005 inch (0.12 mm) in depth with a minimum blend radius of 0.25 inch (6.4 mm).
(e)Do an inspection of the seal teeth region for:
2Nicks, scratches, or dents on 1st tooth (forward tooth):
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.055 inch (1.39 mm) in depth with a flat blend (no blend radius), if the blended area is not more than 0.085 square inch (54.83 square mm).
4Bending of serrations on 1st tooth (forward tooth):
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.055 inch (1.39 mm) in depth with a flat blend (no blend radius), if the blended area is not more than 0.085 square inch (54.83 square mm).
(f)Do an inspection of the ID bayonet for:
1Nicks, dents, scratches, or other damage (do not include ID bayonet groove):
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.005 inch (0.12 mm) in depth with a minimum blend radius of 0.25 inch (6.4 mm).
4Nicks, dents, and scratches, fretting or other damage in ID bayonet groove, with 0.262 inch (6.65 mm) distance from retaining wire assembly slot corner. Refer to Figure 801 and as follows:
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.010 inch (0.25 mm) in depth with a minimum blend radius of 0.50 inch (12.7 mm).
(g)Do an inspection of the forward web and aft web, do not include the air crossover holes and hole corners, for:
1Nicks, dents, scratches, or other damage:
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.005 inch (0.12 mm) in depth with a minimum blend radius of 0.25 inch (6.4 mm).
(i)Do an inspection of the aft damper rail, but do not include the damper hook aft fillets and the damper hook U fillet, for:
1Nicks and scratches:
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.001 inch (0.02 mm) in depth with a minimum blend radius of 0.25 inch (6.4 mm).
2Dents:
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.001 inch (0.02 mm) in depth with a minimum blend radius of 0.25 inch (6.4 mm).
(l)Do an inspection of the forward and aft catenary arms for:
1Nicks, dents, scratches, or other damage:
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.005 inch (0.12 mm) in depth with a minimum blend radius of 0.25 inch (6.4 mm).
(n)Do an inspection of the lip next to the aft rabbet. Refer to Figure 801 and as follows:
1Nicks, dents, scratches, or other damage:
Maximum repairable limit:
Any amount, if you can remove the damage with a blend of not more than 0.007 inch (0.17 mm) in depth with a minimum blend radius of 0.25 inch (6.3 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)
 
2383M85P03  
2383M85P04  
2445M71P01  
2445M71P02  
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 (Scotch Brite pad)
 
C10-021
Tape, Plastic
 
C10-205
Almen Test Strips (type N Almen 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
 
72-53-43
Inspection 001 - Configuration 02
D.Expendable Parts. None.
E.SPD Information.
(1)Locally Manufactured SPD. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-53-43-220-110
A.Refer to Figure 901 and Figure 902 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 72-53-43-350-028
A.Blend the repairable areas of the seal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) and as follows:
(1)Do not blend the areas of the seal with pitting, fretting, or wear.
(2)Blend using limits contained in visual inspection area of this repair.
Subtask 72-53-43-110-011
B.Etch the seal repair 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 C or Class G etchant.
Subtask 72-53-43-230-007
C.Alternative Procedure Available. Do an inspection of the seal repair areas. Refer to TASK 70-32-00-200-002 (INDIRECT INSPECTION METHODS), TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION), Figure 902, and as follows:
(1)Use Class G penetrant.
(2)Refer to TASK 72-53-43-200-806 (72-53-43, INSPECTION 001, CONFIG 02), for reject limits/criteria.
Subtask 72-53-43-230-008
C.A.Alternative Procedure. Do an inspection of the seal repair areas. Refer to TASK 70-32-00-200-002 (INDIRECT INSPECTION METHODS), TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION), Figure 902, and as follows:
(1)Use Class G penetrant.
(2)Refer to TASK 72-53-43-200-806 (72-53-43, INSPECTION 001, CONFIG 02), for reject limits/criteria.
Subtask 72-53-43-350-029
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.
D.Use a C10-010  Scotch Brite pad to remove the effects of the swab etching procedure in the seal repair areas.
Subtask 72-53-43-380-002
E.Peen the seal repair areas. Refer to TASK 70-47-01-380-016 (SHOTPEENING) and as follows:
(1)Apply C10-021  plastic tape to the areas of the seal with thermal spray coating.
(2)Use C04-166  CCW14 steel shot.
(3)Use C10-205  type N Almen strips.
(a)Use a simple or simulative fixture for saturation curve generation and intensity verification.
(4)Peen the seal to an intensity of 0.006-0.012N.
(5)Overspray is permitted out of areas with masking.
(6)125 percent coverage is necessary.
Subtask 72-53-43-350-030
F.Remove all masking from the seal.
Subtask 72-53-43-160-006
G.Clean the repair areas of the seal. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING), TASK 70-21-03-160-001 (CLEANING METHOD NO. 3 - STEAM CLEANING).
Subtask 72-53-43-220-111
H.Do a final inspection of the seal blended areas. Refer to TASK 72-53-43-200-806 (72-53-43, INSPECTION 001, CONFIG 02).
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Figure 901   High Pressure Turbine Rotor Interstage Seal
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Figure 902   (Sheet 1 ) High Pressure Turbine Rotor Interstage Seal - Visual Inspection
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Figure 902   (Sheet 2 ) High Pressure Turbine Rotor Interstage Seal - Visual Inspection
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Figure 903   High Pressure Turbine Rotor Interstage Seal - Flat Blend Of Seal Tooth