* * * FOR ALL
TASK 72-53-44-300-801
1 . Repair for the High Pressure Turbine Rotor Aft Seal.
A.This procedure gives instructions to blend repair the high pressure turbine rotor aft seal (aft seal).
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 72-53-44, Inspection 001. Refer to TASK 72-53-44-200-801 (72-53-44, INSPECTION 001) .
(4)Visual Inspection.
(a)Do an inspection of all areas of the aft seal for:
2Nicks, dents, and scratches (except in area XA, outer air hole, catenary arm inner diameter, hub faces, bore, seal serrations, outer rabbet, inner rabbet, inner flange rabbet, catenary arm slot radii, lower rack seal teeth fillets, flange rabbet fillet, upper rack seal teeth fillets, damper tab fillets, bore to aft cone arm inner diameter fillet, web to seal rack aft inner diameter fillet, lower seal rack to flange fillet, catenary flange fillets, flange to cone arm inner diameter fillet, and edge radii):
Maximum repairable limit:
Not more than 0.01 inch (0.3 mm) in depth after removal of high metal.
Repair method:
Blend with the radii defined below. Refer to Figure 901 and Figure 902.
aBlend damage or defects in the web to seal rack forward inner diameter fillet and aft cone area to lower rack fillet at a minimum blend radius of 0.20 inch (5.1 mm).
bBlend damage or defects in the web, aft cone arm, catenary arm slot vertical contact surface, upper rack seal aft face and lower rack seal aft face at a minimum blend radius of 0.50 inch (12.7 mm). Blending of the catenary arm slot vertical contact surface not allowed in areas displayed in Figure 902.
(c)Do an inspection of the lower rack seal teeth fillets and flange rabbet fillet for:
2Nicks, dents, and scratches:
Maximum repairable limit:
Not more than 0.003 inch (0.08 mm) in depth after the removal of high metal.
Repair method:
Blend with a minimum radius of 0.04 inch (1.0 mm).
(d)Do an inspection of the upper rack seal teeth fillets, damper tab fillets, and bore to aft cone arm inner diameter fillet for:
2Nicks, dents, and scratches:
Maximum repairable limit:
Not more than 0.004 inch (0.10 mm) in depth after the removal of high metal.
Repair method:
Blend with a minimum radius of 0.05 inch (1.3 mm). Blending of upper rack seal teeth fillets not allowed in areas displayed in Figure 902.
(e)Do an inspection of the web to seal rack aft inner diameter fillet, lower seal rack to flange fillet, catenary flange fillets, and flange to cone arm inner diameter fillet for:
2Nicks, dents, and scratches:
Maximum repairable limit:
Not more than 0.008 inch (0.20 mm) in depth after the removal of high metal.
Repair method:
Blend with a minimum radius of 0.10 inch (2.5 mm).
(f)Do an inspection of the catenary arm inner diameter:
2Nicks, dents, and scratches:
Maximum repairable limit:
Not more than 0.005 inch (0.13 mm) in depth after the removal of high metal.
Repair method:
Blend with a minimum radius of 0.50 inch (12.7 mm).
(g)Do an inspection of area XA (outer radial surface only) for:
1Nicks and scratches:
Maximum repairable limit:
One location not more than 0.016 inch (0.41 mm) in depth after the removal of high metal on each part in area XA. Must be separated by more than 2.0 inches (51 mm) from any adjacent blend area. Radius blend and polish to a finish equivalent to that of surrounding material.
Repair method:
Blend with a minimum radius of 0.25 inch (6.4 mm).
(h)Do an inspection of outer seal serrations for:
2Bending:
Maximum repairable limit:
Any amount on only one of the four serrations, if you can remove the damage with one blend, not more than 0.70 inch (17.8 mm) in length, 0.11 inch (2.8 mm) in depth.
Repair method:
Blend with a minimum radius of 0.50 inch (12.7 mm).
3Nicks, dents, and scratches:
Maximum repairable limit:
Any amount on only one of the four serrations, if you can remove the damage with one blend, not more than 0.70 inch (17.8 mm) in length, 0.11 inch (2.8 mm) in depth.
Repair method:
Blend with a minimum radius of 0.50 inch (12.7 mm).
(i)Do an inspection of sump seal teeth for:
2Bending:
Maximum repairable limit:
Any amount on only one of the three teeth, if you can remove the damage with one blend, not more than 0.50 inch (12.7 mm) in length, 0.05 inch (1.3 mm) in depth.
Repair method:
Blend with a minimum radius of 0.50 inch (12.7 mm).
3Nicks, dents, and scratches:
Maximum repairable limit:
Any amount on only one of the three teeth, if you can remove the damage with one blend, not more than 0.50 inch (12.7 mm) in length, 0.05 inch (1.3 mm) in depth.
Repair method:
Blend with a minimum radius of 0.50 inch (12.7 mm).
(j)Do an inspection of the inner air holes (48 holes), and aft inner flange boltholes (15 boltholes) for:
1Nicks, dents, and scratches:
Maximum repairable limit:
Not more than 0.005 inch (0.13 mm) in depth after blend.
Repair method:
Blend with a minimum radius of 0.25 inch (6.4 mm).
(k)Do an inspection of the outer rabbet, inner rabbet, and inner flange rabbet for:
1Fretting:
Maximum repairable limit:
Not more than 0.01 inch (0.3 mm) in depth, is permitted after the removal of high metal, on 10 percent maximum of the surface area of the rabbet.
Repair method:
Blend with a minimum radius of 0.25 inch (6.4 mm).
2Nicks, dents, and scratches:
Maximum repairable limit:
Not more than 0.01 inch (0.3 mm) after blend, on 10 percent maximum of the surface area of the rabbet.
Repair method:
Blend with a minimum radius of 0.25 inch (6.4 mm).
(l)Do an inspection of the seal bore and hub face for:
1Nicks, dents, and scratches:
Maximum repairable limit:
Not more than 0.005 inch (0.13 mm) in depth after blend.
Repair method:
Blend with a minimum radius of 0.25 inch (6.4 mm).
2Damage in the edge radius:
Maximum repairable limit:
Any amount, if you can remove the damage with a blend not more than 0.005 inch (0.13 mm) in depth. Radius blend and polish to a finish of 32 microinches (0.8 micrometers).
Repair method:
Blend with a minimum radius of 0.25 inch (6.4 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)
 
2116M63P01  
2116M63P02  
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D.Proprietary/Complex Process Statement.
(1)None.
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
 
C04-286
Shot, Peening, Cast Steel (AMS 2431/1 ASR), Cast Steel Shot, Regular Hardness (45-52 HRc) (S110 shot)
 
C10-010
Abrasive Cloth (Scotch Brite pad)
 
C10-021
Tape, Plastic
C.Referenced Procedures.
 
ATA No.
Description
 
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
 
72-53-44
Cleaning 001
 
72-53-44
Inspection 001
D.Expendable Parts. None.
E.SPD Information. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
None.
4 . Setup Information.
None.
5 . Procedure.
Subtask 72-53-44-350-001
A.Blend the repairable regions of the aft seal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), and TASK 72-53-44-300-801 (72-53-44, paragraph 1.B.).
Subtask 72-53-44-110-004
B.Etch the aft seal 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 C or G etchant.
Subtask 72-53-44-230-003
C.Alternative Procedure Available. Do an inspection of the aft seal 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)Refer to TASK 72-53-44-200-801 (72-53-44, INSPECTION 001) for inspection limits.
Subtask 72-53-44-230-004
C.A.Alternative Procedure. Do an inspection of the aft seal 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)Refer to TASK 72-53-44-200-801 (72-53-44, INSPECTION 001) for rejection criteria.
Subtask 72-53-44-350-002
D.Polish to remove the effects of the swab etch with a C10-010   Scotch Brite pad.
Subtask 72-53-44-350-003
E.Apply C10-021   plastic tape to coated seal teeth.
Subtask 72-53-44-380-001
F.Peen the aft seal blended areas, except the catenary arm slot. Refer to TASK 70-47-01-380-016 (SHOTPEENING) and as follows:
(1)Use C04-286   S110 shot.
(2)Intensity to 0.006-0.012 N.
Subtask 72-53-44-350-004
G.Remove the plastic tape from seal teeth.
Subtask 72-53-44-100-001
H.Clean the aft seal. Refer to TASK 72-53-44-100-801 (72-53-44, CLEANING 001).
Subtask 72-53-44-200-002
I.Inspect the aft seal. Refer to TASK 72-53-44-200-801 (72-53-44, INSPECTION 001).
* * * FOR ALL
Figure 901   Aft Seal Part Locations
* * * FOR ALL
Figure 902   Areas of No Blending