* * * FOR ALL
TASK 72-53-42-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the HPT rotor forward seal (forward seal) (01-250 , 72-53-00) (SIN 150A3) or (01-250A , 72-53-00) (SIN 150A3) or (02-250 , 72-53-00) (SIN 150A3).
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
 
11C3485G01
Fixture, Machining - Seal, Forward - HPT Rotor (restrain fixture)
 
9429M77G04
Fixture, Lift and Turn - General Purpose (lift/turn fixture)
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C04-166
Shot, Peening, Conditioned Cut Wire (conditioned cut wire)
 
C10-021
Tape, Plastic (masking tape)
 
C10-205
Almen Test Strips (test strips)
C.Referenced Procedures.
 
ATA No.
Description
 
70-32-02
Fluorescent Penetrant Inspection
 
70-47-01
Shotpeening
 
72-53-42
Cleaning 001
 
72-53-42
Repair 001
 
72-53-42
Repair 003
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 72-53-42-350-001
A.Remove the coatings from the seal as follows:
(1)For all part numbers, remove the thermal spray coating from the seal teeth. Refer to TASK 72-53-42-300-801 (72-53-42, REPAIR 001).
(2)For part numbers 2417M60P03   , 2756M01P01   , 2759M04P01   , and 2793M25P01   only, remove the anti-corrosion coating from the aft transition seal neck. Refer to TASK 72-53-42-100-801 (72-53-42, CLEANING 001).
Subtask 72-53-42-230-001
B.Do a Class G fluorescent penetrant inspection of the forward seal. Refer to TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION) and Figure 801.
(1)Carefully examine the areas that follow because they are the most important:
•
Inducer air holes
•
Impeller vanes
•
Area A
•
Stage 1 blade interface
•
Rabbets
•
Inducer pad (forward and aft faces)
•
Seal serrations
•
Seal wire groove.
•
Aft transition seal neck.
(2)Indications more than 0.015 inch (0.38 mm) are not permitted.
Subtask 72-53-42-230-002
C.Do a fluorescent penetrant inspection (FPI) of the forward seal for microcracking in the aft transition seal neck area (aft side of the outer neck between the middle and outer rabbets). Refer to SB 72-0368 and SB 72-0397.
NOTE:
The forward seal with microcracking exhibits glowing fluorescent penetrant inspection patches on the aft side of the outer seal neck between middle and outer rabbets. Refer to Figure 802.
* * * FOR ALL
Figure 801   (Sheet 1 ) Forward Seal - Visual Inspection
* * * FOR ALL
Figure 801   (Sheet 2 ) Forward Seal - Visual Inspection
* * * FOR ALL
Figure 801   (Sheet 3 ) Forward Seal - Visual Inspection
* * * FOR ALL
Figure 801   (Sheet 4 ) Forward Seal - Visual Inspection
* * * FOR ALL
Figure 801   (Sheet 5 ) Forward Seal - Visual Inspection
* * * FOR ALL
Figure 801   (Sheet 6 ) Forward Seal - Visual Inspection
* * * FOR ALL
Figure 802   (Sheet 1 ) Forward Seal - Aft Seal Neck Area
* * * FOR ALL
Figure 802   (Sheet 2 ) Forward Seal Microcracking - Glowing FPI Patches
4 . Visual Inspection.
Refer to Figure 801.
Subtask 72-53-42-220-001
A.Do an inspection of all areas (this does not include seal serrations) of the forward seal for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-002
(2)Nicks, dents, and scratches:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-003
(3)Deleted.
Subtask 72-53-42-220-004
(4)Corrosion/pitting (this does not include area XY):
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-802 (72-53-42, REPAIR 002) .
Subtask 72-53-42-220-005
B.Do an inspection of area XY for:
(1)Corrosion/pitting:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-802 (72-53-42, REPAIR 002) .
Subtask 72-53-42-220-006
C.Do an inspection of all seal serrations for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-007
(2)Nicks, dents, and scratches on the sides of the forward and middle teeth of the OD seal serrations and on the sides of the ID serrations:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-039
(2).A.Nicks, dents, and scratches on the sides of the aft tooth of the OD seal serrations:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-008
(3)Nicks, dents, and scratches on the tips of the forward and middle teeth of the OD seal serrations and on the tip of the ID serrations:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-040
(3).A.Nicks, dents, and scratches on the tip of the aft tooth of the OD seal serrations:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-009
(4)Bends in the tips of the forward and middle teeth of the OD seal serrations and in the tip of the ID serrations:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-041
(4).A.Bends in the tip of the aft tooth of the OD seal serrations:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-010
(5)Missing coating on tip (after recoat):
Maximum serviceable limit:
Missing coating is permitted if the conditions that follow are applicable:
• The limits are within the dimensional inspection limits. Refer to Subtask 72-53-42-220-029 (paragraph 5.C.(2)) and Subtask 72-53-42-220-030 (paragraph 5.C.(3)).
• There is no metal discoloration.
• There is no wear into the metal.
Repair method:
If there is no metal discoloration, repair the forward seal. Refer to TASK 72-53-42-300-801 (72-53-42, REPAIR 001). If there is metal discoloration, replace the forward seal.
Subtask 72-53-42-220-011
(6)Missing coating on seal tooth sides (after recoat):
Maximum serviceable limit:
Any amount, 0.300 inch (7.62 mm) in length, with a cumulative length of missing coating not more than 1.5 inches (38.1 mm) for each tooth. Distance between blends must be 1.00 inch (25.4 mm) or more.
Repair method:
Repair. Refer to TASK 72-53-42-300-801 (72-53-42, REPAIR 001) .
Subtask 72-53-42-220-012
D.Do an inspection of the inducer air holes (62 holes) for:
(1)Nicks, dents, and scratches in the top surface (upper half) of the inducer air holes:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
(For part numbers 2352M60P01   , 2417M60P01   , 2756M01P01   , and 2793M25P01   ) Not serviceable.
Maximum serviceable limit:
(For part numbers 2417M60P02   , 2417M60P03   , and 2759M04P01   ) 0.002 inch (0.05 mm), after the removal of high metal.
Maximum repairable limit:
Deleted.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-013
(2)Nicks, dents, and scratches in the lower surface (lower half) of the inducer air holes:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
(For part numbers 2417M60P01   , 2756M01P01   , and 2793M25P01   ) Not serviceable.
Maximum serviceable limit:
(For part numbers 2417M60P02   , 2417M60P03   , and 2759M04P01   ) 0.002 inch (0.05 mm), after the removal of high metal.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-042
(3)Nicks, dents, and scratches all around the surface of the forward chamfer of the inducer air holes:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
(For part numbers 2417M60P01   , 2756M01P01   , and 2793M25P01   ) Not serviceable.
Maximum serviceable limit:
(For part numbers 2417M60P02   , 2417M60P03   , and 2759M04P01   ) 0.002 inch (0.05 mm), after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-077
(4)Nicks, dents, and scratches in the top surfaces (upper half) of the aft chamfer of the inducer air holes:
Maximum serviceable limit:
(For part numbers 2417M60P01   , 2756M01P01   , and 2793M25P01   ) Not serviceable.
Maximum serviceable limit:
(For part numbers 2417M60P02   , 2417M60P03   , and 2759M04P01   ) 0.001 inch (0.02 mm), after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-078
(5)Nicks, dents, and scratches in the lower surfaces (lower half) of the aft chamfer of the inducer air holes:
Maximum serviceable limit:
(For part numbers 2417M60P01   , 2756M01P01   , and 2793M25P01   ) Not serviceable.
Maximum serviceable limit:
(For part numbers 2417M60P02   , 2417M60P03   , and 2759M04P01   ) 0.001 inch (0.02 mm), after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-014
E.Do an inspection of the blade retainer (forward and aft) for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-015
(2)Deleted.
Subtask 72-53-42-220-016
(3)Deleted.
Subtask 72-53-42-220-017
F.Do an inspection of the stage 1 blade interface for:
(1)Fretting:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
0.01 inch (0.3 mm) in depth, after removal of high metal.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-53-42-220-018
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-019
(3)Deleted.
Subtask 72-53-42-220-020
G.Do an inspection of the OD bayonet (this does not include fillets adjacent to the bayonet) for:
(1).A.Fretting (for part number 2352M60P01):
NOTE:
Do an inspection of the part repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-070
(1).B.Fretting (for part numbers 2417M60P01, 2417M60P02, 2417M60P03, 2756M01P01, 2759M04P01, and 2793M25P01):
NOTE:
Do an inspection of the part repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, up to 0.005 inch (0.12 mm) in depth, after the removal of high metal.
Repair method:
Remove high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) (Subtask 70-42-00-350-038).
Subtask 72-53-42-220-021
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-022
(3)Deleted.
Subtask 72-53-42-220-023
H.Do an inspection of the Spiroloc interface for:
(1)Wear:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-043
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-024
I.Do an inspection of the bayonet tab fillets:
(1)Wear:
Maximum serviceable limit:
0.002 inch (0.05 mm) in depth.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-044
J.Do an inspection of the transition seal neck (forward and aft) for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-045
K.Do an inspection of the web for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-046
L.Do an inspection of the OD seal rack and fillet for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-047
M.Do an inspection of the inducer pad for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-079
(2) Wear or erosion. Refer to Sheet 1:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, up to 0.001 inch (0.02 mm) in depth, after the removal of high metal.
Repair method:
Remove high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) (Subtask 70-42-00-350-038).
Subtask 72-53-42-220-048
N.Do an inspection of the ID seal arm upper for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-049
O.Do an inspection of the ID seal arm lower and fillet for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-050
P.Do an inspection of the bayonet bore for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-051
Q.Do an inspection of the ID bayonet (including forward and aft surfaces) (this does not include fillets adjacent to the bayonet) for:
(1).A.Fretting (for part number 2352M60P01   ):
NOTE:
Do an inspection of the parts repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-071
(1).B.Fretting (for part numbers 2417M60P01   , 2417M60P02   , 2417M60P03   , 2756M01P01   , 2759M04P01, and 2793M25P01):
NOTE:
Do an inspection of the parts repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, up to 0.002 inch (0.05 mm) in depth, after the removal of high metal.
Repair method:
Remove high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) (Subtask 70-42-00-350-038).
Subtask 72-53-42-220-052
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-053
R.Do an inspection of the seal wire groove for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-054
S.Do an inspection of the stage 1 disk rim interface and fillet for:
(1)Fretting:
Maximum serviceable limit:
Any amount, 0.002 inch (0.05 mm) maximum depth.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-055
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-056
T.Do an inspection of the outer air slot for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
* * * FOR ALL
Figure 803   Aft Inducer Pad Wear or Erosion Marks
Subtask 72-53-42-220-057
U.Do an inspection of the impeller vanes for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-058
(2)Fretting:
Maximum serviceable limit:
Any amount, 0.002 inch (0.05 mm) maximum depth.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-059
V.Do an inspection of the impeller vane slot for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-060
W.Do an inspection of the aft web transition for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-061
X.Do an inspection of the stage 1 disk inner interface for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-072
(2).A.Fretting (for part number 2352M60P01):
NOTE:
Do an inspection of the parts repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-073
(2).B.Fretting (for part numbers 2417M60P01, 2417M60P02, 2417M60P03, 2756M01P01, 2759M04P01, and 2793M25P01):
NOTE:
Do an inspection of the parts repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, up to 0.003 inch (0.07 mm) in depth, after the removal of high metal.
Repair method:
Remove high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) (Subtask 70-42-00-350-038).
Subtask 72-53-42-220-062
Y.Do an inspection of the ID rabbet fillet for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-063
Z.Do an inspection of the inner air slot for:
(1)Nicks, dents, and scratches:
NOTE:
Do an inspection of the parts blended before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-064
AA.Do an inspection of the bayonet rabbet for:
(1).A.Fretting (for part number 2352M60P01   ):
NOTE:
Do an inspection of the parts repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-074
(1).B.Fretting (for part numbers 2417M60P01, 2417M60P02, 2417M60P03, 2756M01P01, 2759M04P01, and 2793M25P01):
NOTE:
Do an inspection of the parts repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, up to 0.003 inch (0.07 mm) in depth, after the removal of high metal.
Repair method:
Remove high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) (Subtask 72-42-00-350-038).
Subtask 72-53-42-220-065
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.005 inch (0.12 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 forward seal.
Subtask 72-53-42-220-080
(3)Footprint impressions on the bayonet rabbet (caused by contact from the HPT stage 1 disk bayonet hook). Refer to Figure 801 and Figure 807:
Maximum serviceable limit:
Not serviceable.
Repair method:
Polish the footprint impressions. Refer to TASK 72-53-42-300-804 (72-53-42, REPAIR 004).
Subtask 72-53-42-220-066
AB.Do an inspection of the ID rabbet for:
(1).A.Fretting (for part number 2352M60P01   ):
NOTE:
Do an inspection of the parts repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-075
(1).B.Fretting (for part numbers 2417M60P01, 2417M60P02, 2417M60P03, 2756M01P01, 2759M04P01, and 2793M25P01):
NOTE:
Do an inspection of the parts repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, up to 0.004 inch (0.10 mm) in depth, after the removal of high metal.
Repair method:
Remove high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) (Subtask 70-42-00-350-038).
Subtask 72-53-42-220-067
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth maximum, 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 forward seal.
Subtask 72-53-42-220-068
AC.Do an inspection of the OD rabbet for:
(1).A.Fretting (for part number 2352M60P01   ):
NOTE:
Do an inspection of the parts repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward seal.
Subtask 72-53-42-220-076
(1).B.Fretting (for part numbers 2417M60P01, 2417M60P02, 2417M60P03, 2756M01P01, 2759M04P01, and 2793M25P01):
NOTE:
Do an inspection of the parts repaired before and make sure if they agree with the serviceable limits.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, up to 0.005 inch (0.12 mm) in depth, after the removal of high metal.
Repair method:
Remove high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) (Subtask 70-42-00-350-038).
Subtask 72-53-42-220-069
(2)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) .
Repair method:
Replace the forward seal.
5 . Dimensional Inspection.
Refer to Figure 804.
Subtask 72-53-42-220-025
A.Measure all diameters at eight equally spaced locations. Calculate the average diameter. Compare the average diameter to the dimensions given in the dimensional inspection.
* * * FOR ALL
Figure 804   Forward Seal - Dimensional Inspection
Subtask 72-53-42-220-026
B.The forward seal dimensional inspections can be completed without restraining the part. If the dimensional inspection limits are not met in the unrestrained condition, it is permitted to restrain the forward seal in the 11C3485   restrain fixture with diameter B held round to 0.001 inch (0.03 mm) and surface H held flat to 0.001 inch (0.03 mm). Refer to Figure 805.
NOTE:
11C3485 weights approximately 450 lbs (204 kg).
(1)Use 9429M77   lift/turn fixture to handle the 11C3485   restrain fixture.
* * * FOR ALL
Figure 805   Installation of Forward Seal in the Restrain Fixture 11C3485
Subtask 72-53-42-220-027
C.Do an inspection of the forward seal for:
Subtask 72-53-42-220-028
* * * PRE SB   72-0159( DELETED )
(1)Diameter B of forward seal (for part numbers 2417M60P01   , 2756M01P01   , and 2793M25P01   ):
Minimum serviceable limit:
16.417 inches (416.99 mm).
Maximum serviceable limit:
16.426 inches (417.22 mm).
Repair method:
Replace the forward seal.
* * * END PRE SB   72-0159( DELETED )
Subtask 72-53-42-220-033
* * * PRE SB   72-0159( DELETED )
(1).A.Diameter B of forward seal (for part number 2352M60P01   ):
Minimum serviceable limit:
16.422 inches (417.12 mm).
Maximum serviceable limit:
16.426 inches (417.22 mm).
Repair method:
Replace the forward seal.
* * * END PRE SB   72-0159( DELETED )
Subtask 72-53-42-220-034
* * * SB   72-0159( DELETED )
(1).B.Diameter B of forward seal (for part numbers 2417M60P02   , 2417M60P03   , and 2759M04P01   ):
Minimum serviceable limit:
16.418 inches (417.02 mm).
Maximum serviceable limit:
16.426 inches (417.22 mm).
Repair method:
Replace the forward seal.
* * * END SB   72-0159( DELETED )
Subtask 72-53-42-220-029
(2)OD serrations (V1, V2, and V3) (after recoat):
NOTE:
The minimum and maximum serviceable limits are for reference only. The diameters are applicable only after the coating is applied again.
Minimum serviceable limit:
18.898 inches (480.01 mm) after recoat.
Maximum serviceable limit:
18.902 inches (480.11 mm) after recoat.
Repair method:
Repair. Refer to TASK 72-53-42-300-801 (72-53-42, REPAIR 001) .
Subtask 72-53-42-220-030
(3)ID serrations (X1) (after recoat):
NOTE:
The minimum and maximum serviceable limits are for reference only. The diameters are applicable only after the coating is applied again.
Minimum serviceable limit:
16.580 inches (421.13 mm) after recoat.
Maximum serviceable limit:
16.584 inches (421.23 mm) after recoat.
Repair method:
Repair. Refer to TASK 72-53-42-300-801 (72-53-42, REPAIR 001) .
Subtask 72-53-42-220-031
* * * PRE SB   72-0159( DELETED )
(4)Diameter F of forward seal (for part numbers 2417M60P01   , 2756M01P01   , and 2793M25P01   ):
(a)The serviceability of diameter F is determined based on the value of diameter B. Table 801 below defines the serviceable relationship between diameter B and diameter F.
TABLE 801.HPT Rotor Forward Seal Diameter Serviceable Limits
 
HPT Rotor Forward Seal Diameter Serviceable Limits
 
Instructions:
 
Locate the row that contains the measured value for Diameter B.
The corresponding serviceable limits for Diameter F are in the same row.
 
Diameter B (inches)
Diameter F (inches)
 
Greater than
Less than or equal to
Minimum serviceable
Maximum serviceable
 
Inches
mm
Inches
mm
Inches
mm
Inches
mm
 
16.417*
416.99*
16.420
417.07
22.457
570.40
22.465
570.61
 
16.420
417.07
16.422
417.12
22.457
570.40
22.466
570.64
 
16.422
417.12
16.423
417.14
22.459
570.46
22.470
570.74
 
16.423
417.14
16.424
417.17
22.460
570.48
22.470
570.74
 
16.424
417.17
16.426
417.22
22.466
570.64
22.470
570.74
 
* For this row, Diameter B is intended to be greater than or equal to 16.417 inches (416.99 mm).
Repair method:
Replace the forward seal.
* * * END PRE SB   72-0159( DELETED )
Subtask 72-53-42-220-035
* * * PRE SB   72-0159( DELETED )
(4).A.Diameter F of forward seal (for part number 2352M60P01   ):
Minimum serviceable limit:
22.466 inches (570.64 mm).
Maximum serviceable limit:
22.470 inches (570.74 mm).
Repair method:
Replace the forward seal.
* * * END PRE SB   72-0159( DELETED )
Subtask 72-53-42-220-032
* * * SB   72-0159( DELETED )
(4).B.Diameter F of forward seal (for part numbers 2417M60P02   , 2417M60P03   , and 2759M04P01   ):
(a)The serviceability of diameter F is determined based on the value of diameter B. Table 802 below defines the serviceable relationship between diameter B and diameter F.
TABLE 802.HPT Rotor Forward Seal Diameter Serviceable Limits
 
HPT Rotor Forward Seal Diameter Serviceable Limits
 
Instructions:
 
Locate the row that contains the measured value for Diameter B.
The corresponding serviceable limits for Diameter F are in the same row.
 
Diameter B (inches)
Diameter F (inches)
 
Greater than
Less than or equal to
Minimum serviceable
Maximum serviceable
 
Inches
mm
Inches
mm
Inches
mm
Inches
mm
 
16.418*
417.02*
16.419
417.04
22.410
569.21
22.413
569.29
 
16.419
417.04
16.420
417.07
22.410
569.21
22.414
569.32
 
16.420
417.07
16.421
417.09
22.410
569.21
22.415
569.34
 
16.421
417.09
16.422
417.12
22.412
569.26
22.419
569.44
 
16.422
417.12
16.423
417.14
22.412
569.26
22.419
569.44
 
16.423
417.14
16.424
417.17
22.413
569.29
22.419
569.44
 
16.424
417.17
16.426
417.22
22.414
569.32
22.419
569.44
 
* For this row, Diameter B is intended to be greater than or equal to 16.418 inches (417.02 mm).
Repair method:
Replace the forward seal.
* * * END SB   72-0159( DELETED )
6 . Post Inspection Procedure.
Subtask 72-53-42-380-001
A.Shot peen the surfaces in the marked zones. Refer to Figure 806, TASK 70-47-01-380-016 (SHOTPEENING), and as follows:
(1)Mask the coated areas to prevent coating damage as follows:
(a)Use C10-021  masking tape or an applicable equivalent as necessary.
(2)Use C04-166  conditioned cut wire.
(3)Shot peen to an intensity of 6-12N.
(4)Use C10-205  test strips.
(5)A minimum coverage of 125 percent is necessary.
(6)Remove all the masking tape.
Subtask 72-53-42-350-002
B.Apply the coating to the seal teeth again. Refer to TASK 72-53-42-300-801 (72-53-42, REPAIR 001).
Subtask 72-53-42-350-003
C.For part numbers 2417M60P03   , 2756M01P01   , 2759M04P01   , and 2793M25P01   only, apply anti-corrosion coating to the aft transition seal neck. Refer to TASK 72-53-42-300-803 (72-53-42, REPAIR 003).
* * * FOR ALL
Figure 806   (Sheet 1 ) HPT Forward Seal - Post Inspection Shot Peening Zones
* * * FOR ALL
Figure 806   (Sheet 2 ) HPT Forward Seal - Post Inspection Shot Peening Zones
* * * FOR ALL
Figure 806   (Sheet 3 ) HPT Forward Seal - Post Inspection Shot Peening Zones
* * * FOR ALL
Figure 807   Footprint Impressions on the Bayonet Rabbet