* * * FOR ALL
TASK 72-00-04-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the low pressure turbine (LPT) module assembly (LPT module). Refer to Figure 802.
•
LPT module (45-020 , 72-00-02) (SIN 00105)
•
LPT module (45-021 , 72-00-02) (SIN 00105) (SB 72-0160) (LPT Module Assembly - Non Rake Capable Configuration)
•
LPT module (45-022 , 72-00-02) (SIN 00105) (SB 72-0160) (LPT Module Assembly - Rake Capable Configuration).
(1) Do this inspection before installation of:
•
A module after a maintenance procedure(s)
•
A replacement module
•
A module that was removed to get access to other components.
B.Any sub-assembly or part removed for access or limited workscope must be inspected in accordance with criteria in this section. If there is no criteria, the sub-assembly or part must receive a general visual inspection (GVI) for continued serviceability. Refer to TASK 72-00-00-200-805 (72-00-00, INSPECTION 001) . If required, the component can be hand-cleaned to do a visual inspection. Refer to TASK 70-21-01-110-001 (CLEANING METHOD 1 - SOLVENT DEGREASING) or TASK 70-21-03-160-001 (CLEANING METHOD 3 - STEAM CLEANING) . GVI cannot be done to components identified in TASK 05-21-00-200-801 (05-21-00, LIFE LIMITS 001) that become piece part. These components must have their appropriate mandatory inspections done, unless stated differently in an applicable Service Bulletin.
C.If you find an assembly or part to be unserviceable during this procedure, refer to the applicable section of the engine manual for more disassembly and inspection procedures for that assembly or part.
D.If you fully disassemble the LPT module, this inspection is not necessary. Refer to the applicable section of the engine manual for the inspection procedure for each part.
E.The major components of the LPT module are:
•
Mid fan shaft (45-010 , 72-00-02) (SIN 81000)
•
Mid fan shaft (45-011 , 72-00-02) (SIN 81000) (SB 72-0040)
•
The LPT rotor/stator assembly (rotor/stator assembly) (01-010) (SIN 93000)
•
The LPT rear frame assembly (LPT rear frame) (01-020) (SIN 94000)
•
LPT rear frame (01-021) (SIN 94000) (SB 72-0160) (LPT Module Assembly - Non Rake Capable Configuration)
•
LPT Rear frame (01-022) (SIN 94000) (SB 72-0160) (LPT Module Assembly - Rake Capable Configuration).
F.The maintenance instructions in this Manual do not purport to cover all details or variations in equipment, nor do they provide for every possible contingency to be met in connection with installation, operation, maintenance, or GEAE certified repair facilities. The maintenance instructions are intended to be all-inclusive for a complete teardown and overhaul of the component or sub assembly. The individual procedures as written are one sequence based on General Electric experience. Alternate sequences to these maintenance instructions are at the discretion of the operator and/or overhaul shop provided the intent of the maintenance instructions is met. The operator and/or overhaul shop can select specific tasks to partially disassemble and assemble hardware or subassemblies based upon the on demand maintenance requirement of the individual engine work scope provided the final assembly configuration and requirements contained in the manual have been met.
G.You can observe the serviceable mount surface irregularities (machined marks around the mount bushings) on the TRF mount lugs: forward side of the forward mount lugs and aft side of the aft mount lugs. The regular production process requires specific clearance between the mounting pin and TRF mount lugs. Make sure that these TRF mount lugs are machined (if necessary) around the mount lug hole. The machining effect can be noticed as a circumferential mark, a single mark or a series of small marks located circumstantially. Usually it is only one mark located on the upper half of the mount lug surface. The machining marks are smooth, shiny and can generate a surface step within specific diameters (FM and RM) from the center of the lug bushing. Refer to Figure 801.
NOTE:
Diameters are provided only for information and are not part of inspection process.
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
 
9C1126G01
Dolly, Low Pressure Turbine Module/Mid Shaft (dolly)
 
11C3280G02
Adapter Set For Dolly, Low Pressure Turbine - Module/Mid Shaft (adapter set)
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C03-038
Paint, Sermetel (paint)
 
C03-107
Inorganic Sealant, Touch-up (paint)
 
C03-108
Inorganic Sealant, Touch-up (paint)
 
C04-003
Solvent, General (solvent)
 
C04-035
Solvent, General (solvent)
 
C04-072
Acid (acid)
C.Referenced Procedures.
 
ATA No.
Description
 
05-21-00
Life Limits 001
 
70-21-01
Cleaning Method 1 - Solvent Degreasing
 
70-21-03
Cleaning Method 3 - Steam Cleaning
 
70-31-02
Acceptability Limits for Fluorescent Penetrant Inspection
 
70-32-03
Spot-Fluorescent-Penetrant Inspection
 
70-32-16
Serviceability Inspection of the Fan Mid Shaft
 
70-42-00
Blending and Removal of High Metal Procedures
 
70-43-05
Inorganic Aluminum Protective Coating
D.Expendable Parts. None.
3 . Specific Inspection Procedure.
Subtask 72-00-04-230-001
CAUTION:
THE STAGES 6 AND 7 LPT BLADES ARE MADE FROM TITANIUM ALUMINIDE MATERIAL AND ARE RELATIVELY BRITTLE AT ROOM TEMPERATURE. HANDLE WITH CARE TO PREVENT DAMAGE TO THE PARTS.
A.Do a fluorescent penetrant inspection (FPI) of the inner and outer surfaces of the LPT rear frame at the rear mount lug locations.
Subtask 72-00-04-230-002
* * * PRE SB   72-0063
* * * PRE SB   72-0138
* * * PRE SB   72-0160
(1)Do a Class C spot-fluorescent-penetrant inspection of the outer and inner surfaces of the LPT rear frame. Refer to Figure 803 with spot-fluorescent-penetrant inspection areas definition and TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION). The limits must meet Class A (non welded parts) for structures and flanges and Class B (fusion welded parts) for welds. Refer to TASK 70-31-02-220-003 (ACCEPTABILITY LIMITS FOR FLUORESCENT PENETRANT INSPECTION).
(a)Indications less than 0.03 inch (0.8 mm) are not interpretable and are acceptable.
* * * END PRE SB   72-0160
* * * END PRE SB   72-0138
* * * END PRE SB   72-0063
Subtask 72-00-04-230-003
* * * SB   72-0063
* * * SB   72-0138
* * * SB   72-0160
(1).A.Do a Class C spot-fluorescent-penetrant inspection of the outer and inner surfaces of the LPT rear frame. Refer to Figure 804 and TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION). The limits must meet Class A (non welded parts) for structures and flanges and Class B (fusion welded parts) for welds. Refer to TASK 70-31-02-220-003 (ACCEPTABILITY LIMITS FOR FLUORESCENT PENETRANT INSPECTION).
(a)Indications less than 0.03 inch (0.8 mm) are not interpretable and are acceptable.
* * * END SB   72-0160
* * * END SB   72-0138
* * * END SB   72-0063
4 . Visual Inspection.
Subtask 72-00-04-220-001
A.Do an inspection of the forward flange of the low pressure turbine case (LPT case) (935C1) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-037
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount 0.03 inch (0.8 mm) in depth after the removal of high metal, if the damage is a minimum of 1.00 inch (25.4 mm) away from other damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-038
(3)Dents:
Maximum serviceable limit:
Any amount, if the dents do not go across more than 75 percent of the face of the flange and the dents do not cause distortion of the flange.
Repair method:
Replace the LPT module.
* * * FOR ALL
Figure 801   TRF Unusual Visual Condition on the Mount Lugs
* * * FOR ALL
Figure 802   (Sheet 1 ) LPT Module - Inspection
* * * FOR ALL
Figure 802   (Sheet 2 ) LPT Module - Inspection
* * * FOR ALL
Figure 802   (Sheet 3 ) LPT Module - Inspection
* * * FOR ALL
Figure 802   (Sheet 4 ) LPT Module - Inspection
* * * FOR ALL
Figure 802   (Sheet 5 ) LPT Module - Inspection
* * * FOR ALL
Figure 802   (Sheet 6 ) LPT Module - Inspection
* * * FOR ALL
Figure 802   (Sheet 7 ) LPT Module - Inspection
* * * FOR ALL
* * * PRE SB   72-0063
* * * PRE SB   72-0138
* * * PRE SB   72-0160
Figure 803   (Sheet 1 ) LPT Module - Inspection
* * * FOR ALL
* * * PRE SB   72-0063
* * * PRE SB   72-0138
* * * PRE SB   72-0160
Figure 803   (Sheet 2 ) LPT Module - Inspection
* * * FOR ALL
* * * PRE SB   72-0063
* * * PRE SB   72-0138
* * * PRE SB   72-0160
Figure 803   (Sheet 3 ) LPT Module - Inspection
* * * FOR ALL
* * * PRE SB   72-0063
* * * PRE SB   72-0138
* * * PRE SB   72-0160
Figure 803   (Sheet 4 ) LPT Module - Inspection
* * * FOR ALL
* * * SB   72-0063
* * * SB   72-0138
* * * SB   72-0160
Figure 804   (Sheet 1 ) LPT Module - Inspection
* * * FOR ALL
* * * SB   72-0063
* * * SB   72-0138
* * * SB   72-0160
Figure 804   (Sheet 2 ) LPT Module - Inspection
* * * FOR ALL
* * * SB   72-0063
* * * SB   72-0138
* * * SB   72-0160
Figure 804   (Sheet 3 ) LPT Module - Inspection
Subtask 72-00-04-220-003
B.Do an inspection of the aft flange of the LPT case (935C1) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-041
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount 0.03 inch (0.8 mm) in depth after the removal of high metal, if the damage is a minimum of 1.00 inch (25.4 mm) away from other damage. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-042
(3)Dents:
Maximum serviceable limit:
Any amount, if the dents do not go across more than 75 percent of the face of the flange and the dents do not cause distortion of the flange.
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-108
C.Do an inspection of the visible portions of the stage 2, stage 4, and stage 6 borescope ports as follows:
(1)Cracks in the borescope seat:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-109
(2)Damage to the borescope plugs:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the borescope plug.
Subtask 72-00-04-220-117
(3)Discoloration of the borescope plugs:
Maximum serviceable limit:
Any amount.
Repair method:
Replace the borescope plug.
Subtask 72-00-04-220-110
(4)Damage to the borescope seat nuts:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nuts.
Subtask 72-00-04-220-004
D.Do an inspection of all other areas of the LPT case (935C1) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Ten cracks, 0.032 inch (0.81 mm) in length and 0.10 inch (2.5 mm) apart.
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-043
(2)Nicks:
Maximum serviceable limit:
Any amount 0.015 inch (0.38 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 LPT module.
Subtask 72-00-04-220-044
(3)Scratches and scores:
Maximum serviceable limit:
•
Any amount in the axial direction, 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).
•
Any amount in the circumferential direction, 0.010 inch (0.25 mm) in depth after the removal of high metal, if the scratches and scores are a minimum of 1.00 inch (25.4 mm) away from other scratches or scores. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-045
(4)Dents:
Maximum serviceable limit:
Any amount 0.125 inch (3.18 mm) in depth, if they have a smooth contour.
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-046
(5)Hot spots (distortion):
Maximum serviceable limit:
Any amount, if there are no cracks and the metal is not granular.
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-047
(6)Heat discoloration:
Maximum serviceable limit:
Any amount, if there are no related bulges in 50 percent of the external surface.
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-048
(7)Bulges:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT module.
Subtask 72-00-04-220-005
E.Do an inspection of all areas of the stage 1 LPT blades (stage 1 blades) (930A1) and the stage 7 LPT blades (stage 7 blades) (930A7) as follows. Refer to Figure 805.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-151
(2)Stage 1 blades for corrosion on the airfoil and the tip and root fillets:
Maximum serviceable limit:
Any amount permitted, if there is no missing, chipping, and peeling of the coating.
Maximum repairable limit:
Not repairable.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-152
(3)Stage 1 blades for corrosion on the platform:
Maximum serviceable limit:
Any amount permitted.
Maximum repairable limit:
Not repairable.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-049
(4)Stage 7 blades for corrosion:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the rotor/stator assembly.
* * * FOR ALL
Figure 805   (Sheet 1 ) Stage 1 and Stage 7 Blades (Typical) - Inspection
* * * FOR ALL
Figure 805   (Sheet 2 ) Stage 1 and Stage 7 Blades (Typical) - Inspection
Subtask 72-00-04-220-120
F.Do an inspection of the surfaces of the airfoil of the stage 1 blade.
(1)Metal splatter:
Maximum serviceable limit:
Any amount, if it is in the coating and there is no missing, chipping, or peeling of the coating.
Repair method:
Replace the stage 1 blade.
Subtask 72-00-04-220-006
G.Do an inspection of areas X and Y on the surfaces of the concave and convex sides of the stage 1 (930A1) and stage 7 blades (930A7) as follows. Refer to Figure 805.
(1)Nicks, scores, scratches, and pitting:
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 rotor/stator assembly.
Subtask 72-00-04-220-050
(2)High Metal:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Remove the damage with a fine file or honing stone. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-051
(3)Dents:
Maximum serviceable limit:
Any amount not more than 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 rotor/stator assembly.
Subtask 72-00-04-220-007
H.Do an inspection of the surfaces of the concave and convex sides of the stage 1 blades (930A1), but do not include areas X and Y, as follows. Refer to Figure 805.
(1)Nicks and scratches:
Maximum serviceable limit:
Any amount 0.005 inch (0.13 mm) in depth.
Maximum repairable limit:
Any amount that you can remove with a blend 0.031 inch (0.79 mm) in depth, if all the blends are a minimum of 0.250 inch (6.35 mm) away from each other.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-052
(2)Dents:
Maximum serviceable limit:
Any amount, if the opposite side of the blade is not deformed.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-008
* * * PRE SB   72-0040
I.Do an inspection of the platforms of the stage 1 (05-010 , 72-56-00) (SIN 930A1) and stage 7 blades (10-190 , 72-56-00) (SIN 930A7) (does not include blade root fillet radiuses, unless specified differently). Refer to Figure 805 and as follows:
(1)Nicks and scratches:
Maximum serviceable limit:
Any amount 0.020 inch (0.51 mm) in depth.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-053
(2)Dents:
Maximum serviceable limit:
Three dents, 0.030 inch (0.76 mm) in depth on each side.
Repair method:
Replace the rotor/stator assembly.
* * * END PRE SB   72-0040
Subtask 72-00-04-220-198
* * * SB   72-0040
I.A.Do an inspection of the platforms of the stage 1 (05A-010 , 72-56-00) (SIN 930A1) and stage 7 blades (10A-190 , 72-56-00) (SIN 930A7) (does not include blade root fillet radiuses, unless specified differently). Refer to Figure 805 and as follows:
(1)Nicks, chips, and scratches on stage 1 blade:
Maximum serviceable limit:
Any amount 0.020 inch (0.51 mm) in depth.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-199
(2)Nicks, chips, and scratches on stage 7 blade:
Maximum serviceable limit:
Any amount, if contained within volume V, maximum 0.010 inch (0.25 mm) in depth elsewhere.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-200
(3)Dents:
Maximum serviceable limit:
Three dents, 0.030 inch (0.76 mm) in depth on each side.
Repair method:
Replace the rotor/stator assembly.
* * * END SB   72-0040
Subtask 72-00-04-220-009
J.Do an inspection of the tip shroud of the stage 1 (930A1) and stage 7 blades (930A7) as follows. Refer to Figure 805.
(1)Nicks and scratches:
Maximum serviceable limit:
Any amount 0.020 inch (0.51 mm) in depth.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-054
(2)Dents:
Maximum serviceable limit:
Three dents, 0.030 inch (0.76 mm) in depth on each side.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-055
(3)Wear on the interlock:
Maximum serviceable limit:
Amounts as specified in Figure 806, if the axial preload is in the serviceable limits. Refer to Figure 807.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-056
(4)Axial preload:
Maximum serviceable limit:
Any amount, if the axial preload is in the serviceable limits. Refer to Figure 807.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-057
(5)Circumferential movement:
Maximum serviceable limit:
Any amount, if the axial preload is in the serviceable limits. Refer to Figure 807.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-058
(6)Shingling or disconnected tip shrouds. Refer to Figure 806.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, if the tip shrouds can be locked and the axial preload is in the serviceable limits. Refer to Figure 807.
Repair method:
Lock the shrouds and look for axial preload. Refer to Figure 807.
Subtask 72-00-04-220-059
(7)Radial mismatch:
Maximum serviceable limit:
Any amount, if the mismatch is not more than the thickness of the tip shroud at the mate face.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-060
(8)Nicks, dents, scores, and pitting on the trailing edge of the tip shroud (stage 7 only):
Maximum serviceable limit:
Any amount 0.010 inch (0.25 mm) in depth, if the damage is not in the same plane as the trailing edge.
Maximum repairable limit:
Any amount 0.060 inch (1.52 mm) or less in depth, if the damage is a minimum of 0.100 inch (2.54 mm) away from the trailing edge of the blade, and if the total area of repair is not more than 50 percent of the total area of the tip shroud.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-061
(9)Nicks, scratches, scores, and pitting on the leading edge of the stage 1 blades and the trailing edge of the stage 7 blades:
Maximum serviceable limit:
Any amount 0.015 inch (0.38 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 rotor/stator assembly.
Subtask 72-00-04-220-062
(10)Nicks, dents, scores, and pitting on the tip and root fillets on the leading and trailing edges:
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 rotor/stator assembly.
Subtask 72-00-04-220-063
(11)Corrosion:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the rotor/stator assembly.
* * * FOR ALL
Figure 806   Wear Conditions on the Tip Shrouds of the Stage 1 and Stage 7 Blades
* * * FOR ALL
Figure 807   Axial Preload Conditions of the Stage 1 and Stage 7 Blades
Subtask 72-00-04-220-010
K.Do an inspection of areas X and Y on the leading edge of the stage 1 blades (930A1) as follows. Refer to Figure 805.
(1)Nicks, scores, scratches, and pitting:
Maximum serviceable limit:
Any amount 0.005 inch (0.13 mm) in depth.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-064
(2)High metal:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Remove high metal with a fine file or honing stone. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-153
(3)Dents:
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 rotor/stator assembly.
Subtask 72-00-04-220-011
L.Do an inspection of the leading edge, but do not include areas X and Y, of the stage 1 blade (930A1) as follows. Refer to Figure 805.
(1)Nicks, scores, scratches, and pitting:
Maximum serviceable limit:
Any amount 0.015 inch (0.38 mm) in depth.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-065
(2)High metal:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Remove high metal with a fine file or honing stone. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-155
(3)Dents:
Maximum serviceable limit:
•
Any amount, if no protrusion on the opposite side after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Three dents for each side with protrusions on the opposite side are permitted, if they do not exceed 0.025 inch (0.64 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 rotor/stator assembly.
Subtask 72-00-04-220-012
M.Do an inspection of the tip and root fillets of the stage 1 blade (930A1) as follows. Refer to Figure 805.
(1)Nicks, scores, and pitting on the tip and root fillets:
Maximum serviceable limit:
Any amount 0.005 inch (0.13 mm) in depth.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-154
(2)Dents:
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 rotor/stator assembly.
Subtask 72-00-04-220-014
N.Do an inspection of the LPT rotating air brush seal (brush seal) (930D4) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the brush seal.
Subtask 72-00-04-220-066
(2)Rubs and grooves in the chromium carbide surface:
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 brush seal.
Subtask 72-00-04-220-067
(3)Nicks, dents, and gouges in the chromium carbide surface:
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 brush seal.
Subtask 72-00-04-220-111
(4)Nicks, dents, and scratches in all other locations:
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 brush seal.
Subtask 72-00-04-220-112
(5)Chipped or missing coating:
Maximum serviceable limit:
Not more than 10 locations, 0.100 inch (2.54 mm) in diameter without loose material.
Repair method:
Replace the brush seal.
Subtask 72-00-04-220-015
O.Do an inspection of the LPT rear frame (01-020) (SIN 94000) forward outer flange. Refer to Figure 802 and do as follows:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-068
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount 0.040 inch (1.02 mm) in depth after the removal of high metal, if the damage does not go across the full width of the sealing surface. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-069
(3)Dents:
Maximum serviceable limit:
Any amount 0.060 inch (1.52 mm) in depth and the dents have a smooth contour.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-016
P.Do an inspection of the outer case outer surface, excluding area A (rear mount lugs) of the LPT rear frame (01-020) (SIN 94000). Refer to Figure 802 and do as follows:
(1)Cracks in the parent material:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-133
(2)Cracks in the welds:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-070
(3)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount 0.040 inch (1.02 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 LPT rear frame.
Subtask 72-00-04-220-071
(4)Dents:
Maximum serviceable limit:
Any amount 0.150 inch (3.81 mm) in depth, if the dents have a smooth contour.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-125
Q.Do an inspection of the rear mount lugs area given by area A (airflow side and outer case outer surface). Refer to Figure 802 and Figure 808 and do as follows:
(1)Cracks in parent metal:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-128
(2)Cracks in the welds:
Maximum serviceable limit:
One crack, 0.060 inch (1.52 mm) in length for each joint, no more than two cracks for each frame.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-134
(3)Bushing that is out of position:
Maximum serviceable limit:
Any amount, if the bushing and/or the bore are not damaged.
Repair method:
Repair. Refer to TASK 72-00-00-800-809 (72-00-00, SPECIAL PROCEDURE 009).
Subtask 72-00-04-220-135
(4)Bushing that is missing:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-136
(5)Nicks, dents, scores, and scratches (area M not included):
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth, and 0.100 inch (2.54 mm) length 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 LPT rear frame.
Subtask 72-00-04-220-137
(6)Nicks, dents, scores, and scratches in area M:
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:
Any amount, 0.015 inch (0.38 mm) in depth.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-138
NOTE:
(HES) Q1) If damage is 0.009 inch in depth, could we blend to 0.015 or more in depth after remove damage in order to get a smooth surface and in the meantime lug thickness after blending is still in limits? Q2) Does "Maximum repairable limit: Any amount, 0.010 inch (0.25 mm) in depth", both brfore and after blending to remove damage, the depth should be within this limit? Please be advised that, allowed 0.010” means max depth of damage that can be subject of further blend repair. Then you follow Repair method that reads “Remove minimum material as possible” – this allows for additional not quantified amount material to be removed during blending repair. Therefore, at the end since we do not know how much material was finally removed you must ensure wall thickness is within requirements. Based on above: A1: Yes. A2: 0.010” means max depth of damage before repair. Refer to Case #02027176.
(7)Circumferential scratches or scores on the forward surface of the forward lugs around mount bushings:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth, after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) . Around mount bushings in an area of 0.250 inch (6.35 mm) from bushing hole and outwards. Damages to fillet radii around mount lug are not accepted.
Maximum repairable limit:
Any amount, 0.010 inch (0.25 mm) in depth. Around mount bushings in an area of 0.250 inch (6.35 mm) from bushing hole and outwards. Damages to fillet radii around mount lug are not accepted.
Repair method:
Remove the damage with a blend procedure. Remove minimum material as possible. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) . Do a local swab etch and spot FPI after repair. Measure the lug thickness after blending (in blended area). Minimum lug thickness after blending must be 0.967 inch (24.56 mm).
Subtask 72-00-04-220-139
(8)Circumferential scratches or scores on the aft surface of the aft lugs around mount bushings:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth, after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) . Around mount bushings in an area of 0.250 inch (6.35 mm) from bushing hole and outwards. Damages to fillet radii around mount lug are not accepted.
Maximum repairable limit:
Any amount, 0.010 inch (0.25 mm) in depth. Around mount bushings in an area of 0.250 inch (6.35 mm) from bushing hole and outwards. Damages to fillet radii around mount lug are not accepted.
Repair method:
Remove the damage with a blend procedure. Remove minimum material as possible. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) . Do a local swab etch and spot FPI after repair. Measure the lug thickness after blending (in blended area). Minimum lug thickness after blending must be 0.967 inch (24.56 mm).
* * * FOR ALL
Figure 808   LPT Rear Mount Lugs - Inspection
Subtask 72-00-04-220-017
R.Do an inspection of the aft outer flange of the LPT rear frame (01-020) (SIN 94000). Refer to Figure 802 and as follows:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-072
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount 0.040 inch (1.02 mm) in depth after the removal of high metal, if the damage does not go across the full width of the sealing surface. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-073
(3)Dents:
Maximum serviceable limit:
Any amount 0.060 inch (1.52 mm) in depth, if the dents have a smooth contour.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-121
S.Do an inspection of the aft inner flange of the LPT rear frame. Refer to Figure 802 and do as follows:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-122
(2)Nicks, dents, scores, and scratches (area X not included):
Maximum serviceable limit:
Any amount 0.030 inch (0.76 mm) in depth and 0.120 inch (3.05 mm) in length after the removal of high metal, if the damage does not go across the full width of the sealing surface. 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 if the damage does not go across the full width of the sealing surface.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-123
(3)Nicks, dents, scores, and scratches at area X:
Maximum serviceable limit:
Any amount 0.010 inch (0.25 mm) in depth and 0.120 inch (3.05 mm) in length after the removal of high metal, if the damage does not go across the full width of the sealing surface. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-124
(4)Deformation:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-018
T.Do an inspection of the struts and airflow surfaces (hub airflow surface and outer case airflow surface), excluding area A (rear mount lugs) of the LPT rear frame (01-020) (SIN 94000). Refer to Figure 802 and do as follows:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-074
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount 0.030 inch (0.76 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 LPT rear frame.
Subtask 72-00-04-220-075
(3)Dents on struts (struts No. 7 and No. 8 not included):
Maximum serviceable limit:
Any amount, 0.20 inch (5.1 mm) in depth, if the dents have a smooth contour.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-126
(4)Dents on struts No. 7 and No. 8:
Maximum serviceable limit:
Any amount, 0.040 inch (1.02 mm) in depth, if the dents have a smooth contour.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-127
(5)Dents on airflow surfaces (hub airflow surface and outer case airflow surface):
Maximum serviceable limit:
Any amount, 0.060 inch (1.52 mm) in depth, if the dents have a smooth contour.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-019
U.Do an inspection of the hub area of the LPT rear frame (01-020) (SIN 94000). Refer to Figure 802 and do as follows:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-076
(2)Nicks, dents, scores, and scratches:
Maximum serviceable limit:
Any amount 0.030 inch (0.76 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 LPT rear frame.
Subtask 72-00-04-220-077
(3)Deleted.
Subtask 72-00-04-220-078
(4)Deleted.
Subtask 72-00-04-220-079
(5)Deleted.
Subtask 72-00-04-220-020
V.Do an inspection of the supply tube (443A1) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-080
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount 0.015 inch (0.38 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 LPT rear frame.
Subtask 72-00-04-220-081
(3)Dents:
Maximum serviceable limit:
Any amount 0.060 inch (1.52 mm) in depth, if the dents have a smooth contour.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-145
(4)External coking:
Maximum serviceable limit:
Medium coking is acceptable. Medium means after cleaning process, there is no loose coking and at least 50 percent of tubes bare surface is visible.
Repair method:
Re-clean the tube.
Subtask 72-00-04-220-021
W.Do an inspection of the scavenge tube (452A1) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-082
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount 0.015 inch (0.38 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 LPT rear frame.
Subtask 72-00-04-220-083
(3)Dents:
Maximum serviceable limit:
Any amount 0.060 inch (1.52 mm) in depth, if the dents have a smooth contour.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-04-220-146
(4)External coking:
Maximum serviceable limit:
Medium coking is acceptable. Medium means after cleaning process, there is no loose coking and at least 50 percent of tubes bare surface is visible.
Repair method:
Re-clean the tube.
Subtask 72-00-04-220-118
X.Do an inspection of the connector supply 1 assembly tube (443A0) and connector scavenge assembly tube (452A0) as follows. Refer to Figure 802.
(1)Nicks, scratches, chafing, or scores in straight section and bends:
Maximum serviceable limit:
0.005 inch (0.13 mm) in depth.
Repair method:
Replace the tube.
Subtask 72-00-04-220-147
(2)External coking:
Maximum serviceable limit:
Medium coking is acceptable. Medium means after cleaning process, there is no loose coking and at least 50 percent of tubes bare surface is visible.
Repair method:
Re-clean the tube.
Subtask 72-00-04-220-023
Y.Do an inspection of all areas of the mid fan shaft module assembly (mid fan shaft) (81000) as follows. Refer to Figure 809.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-085
(2)Peeling, blistering, and missing aluminum protective coating (this paragraph does not apply to area GA and area GB):
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
•
Maximum area of individual defect must not be larger than 6.0 sq in. (38.7 sq cm)
•
Maximum total area of defects must not be larger than five percent of the total painted surface area.
Repair method:
Touch up the aluminum paint. Refer to TASK 70-43-05-380-005 (INORGANIC ALUMINUM PROTECTIVE COATING) .
Subtask 72-00-04-220-086
(3)Oil and coking deposits:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Remove coking.
Subtask 72-00-04-220-192
(4)Deleted.
Subtask 72-00-04-220-193
(5)Deleted.
Subtask 72-00-04-220-201
(6)Peeling, blistering, and missing coating (for area GA):
NOTE:
Area GA is a mandatory seal coated area.
NOTE:
Area GA is a mandatory seal coated area however, per caution note, seal coat touch-up can only be applied on intact aluminum coat.If the aluminum protective coating is damaged or removed,only the aluminum paint touch-up must be applied. Refer to Case #01958143.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit 1:
If there is seal coat damage, apply the limits that follow:
CAUTION:
SEAL COAT TOUCH-UP CANNOT BE APPLIED ON BASE MATERIAL, THUS ALUMINUM COAT HAS TO BE INTACT. OTHERWISE FIRST OFF REFER TO MAXIMUM REPAIRABLE LIMIT 2: ALUMINUM COAT TOUCH-UP.
•
Maximum area of individual defect must not be larger than 0.200 sq in. (1.29 sq cm)
•
Maximum total area of defects must not be more than five percent of the total painted surface area.
Repair method 1:
Touch up the seal coat. Use C03-107  paint (khaki color) or C03-108  paint (green color) to touch up the seal coating. Refer to TASK 72-58-40-300-812 (72-58-40, REPAIR 013).
Maximum repairable limit 2:
If aluminum protective coating is damaged, apply the limits that follow:
•
Maximum area of individual defect must not be larger than 6.00 sq in. (38.7 sq cm)
•
Maximum total area of defects must not be more than five percent of the total painted surface area.
Repair method 2:
Touch up the aluminum paint. Refer to TASK 70-43-05-380-005 (INORGANIC ALUMINUM PROTECTIVE COATING) .
Subtask 72-00-04-220-202
(7)Peeling, blistering, and missing coating (for area GB):
NOTE:
Area GB is a seal coat overspray/optional area. It can be only coated with aluminum coat or it can have seal coat applied over base aluminum coat.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit 1:
If there is seal coat damage, apply the limits that follow:
CAUTION:
SEAL COAT TOUCH-UP CANNOT BE APPLIED ON BASE MATERIAL, THUS ALUMINUM COAT HAS TO BE INTACT. OTHERWISE FIRST OFF REFER TO MAXIMUM REPAIRABLE LIMIT 2: ALUMINUM COAT TOUCH-UP.
•
Maximum area of individual defect must not be larger than 0.200 sq in. (1.29 sq cm)
•
Maximum total area of defects must not be more than five percent of the total painted surface area.
Repair method 1:
Touch up the seal coat. Use C03-107  paint (khaki color) or C03-108  paint (green color) to touch up the seal coating. Refer to TASK 72-58-40-300-812 (72-58-40, REPAIR 013).
Maximum repairable limit 2:
If aluminum protective coating is damaged, apply the limits that follow:
•
Maximum area of individual defect must not be larger than 6.00 sq in. (38.7 sq cm)
•
Maximum total area of defects must not be more than five percent of the total painted surface area.
Repair method 2:
Touch up the aluminum paint. Refer to TASK 70-43-05-380-005 (INORGANIC ALUMINUM PROTECTIVE COATING) .
Subtask 72-00-04-220-194
(8)Corrosion pit:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
* * * FOR ALL
Figure 809   (Sheet 1 ) Mid Fan Shaft - Inspection
* * * FOR ALL
Figure 809   (Sheet 2 ) Mid Fan Shaft - Inspection
* * * FOR ALL
Figure 809   (Sheet 3 ) Mid Fan Shaft - Inspection
Subtask 72-00-04-220-025
Z.Do an inspection of area D (loaded side critical) of the external splines of the mid fan shaft (81000) as follows. Refer to Sheet 2.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-114
(2)Nicks and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-089
(3)Fretting:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-090
(4)High metal:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount in a maximum area of 10 teeth.
Repair method:
Remove high metal with a fine file or a honing stone. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-115
AA.Do an inspection of area E of the external splines of the mid fan shaft (81000) as follows. Refer to Sheet 2.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-116
(2)Nicks and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-026
AB.Do an inspection of the outside diameter (OD) of the external splines of the mid fan shaft (81000) as follows. Refer to Figure 809.
(1)Nicks and scratches:
Maximum serviceable limit:
Any amount 0.005 inch (0.13 mm) in depth.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-027
AC.Do an inspection of all other areas of the external splines of the mid fan shaft (81000) as follows. Refer to Figure 809.
(1)Nicks and scratches:
Maximum serviceable limit:
Any amount 0.004 inch (0.10 mm) in depth.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-092
(2)Fretting:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-093
(3)High metal:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, in a maximum area of 10 teeth.
Repair method:
Remove high metal with a fine file or honing stone. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-028
AD.Do an inspection of the internal threads and forward threads of the mid fan shaft (81000) as follows. Refer to Figure 809.
(1)Damage:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount. Complete removal of the entrance thread is permitted if the total amount of damage on all other threads added together is not more than one-half of one full thread.
Repair method:
Remove the damage with a fine file or honing stone. The lead-in contour at the damaged area must be the same as the initial contour. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-029
AE.Do an inspection of the torques slots and tangs of the mid fan shaft (81000) as follows. Refer to Figure 809.
(1)Nicks, dents, and burrs in the torque slots and tangs:
Maximum serviceable limit:
Any amount, 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 mid fan shaft.
Subtask 72-00-04-220-095
(2)Bent tangs (handling damage):
Maximum serviceable limit:
Any amount, if there is no interference with installation of the center vent tube.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-096
(3)Cracked tangs:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-030
AF.Do an inspection of the forward pilot diameter (diameter B) of the mid fan shaft (81000) as follows. Refer to Figure 809.
(1)Nicks and scratches:
Maximum serviceable limit:
Any amount 0.004 inch (0.10 mm) in depth and 0.020 inch (0.51 mm) wide, after the removal of high metal. No sharp grooves permitted. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-097
(2)Wear/galling:
Maximum serviceable limit:
0.004 inch (0.10 mm) in depth on no more than 50 percent of the pilot diameter surface.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-098
(3)High metal:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Remove the high metal with a fine file or honing stone. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-031
AG.Do an inspection of the aft pilot diameter (diameter A) of the mid fan shaft (81000) as follows. Refer to Figure 809.
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.006 inch (0.15 mm) in depth, after the removal of high metal. No sharp grooves permitted. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-099
(2)Wear/galling:
Maximum serviceable limit:
0.006 inch (0.15 mm) in depth on no more than 50 percent of the total pilot diameter surface, 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 mid fan shaft.
Subtask 72-00-04-220-100
(3)High metal:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Remove the high metal with a fine file or honing stone. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-032
AH.Do an inspection of the adjusting washer seating surface (surface C) of the mid fan shaft (81000) as follows. Refer to Figure 809.
(1)Fretting and galling:
Maximum serviceable limit:
Any amount 0.004 inch (0.10 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 mid fan shaft.
Subtask 72-00-04-220-101
(2)Pitting:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-102
(3)Nicks and dents:
Maximum serviceable limit:
Any amount 0.029 inch (0.74 mm) in depth up to 15 percent of the total area after the removal of the high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-103
(4)Scratches:
Maximum serviceable limit:
Any amount 0.019 inch (0.48 mm) in depth up to 15 percent of the total area 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 mid fan shaft.
Subtask 72-00-04-220-104
(5)High metal:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Remove the high metal with a fine file or honing stone. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-04-220-148
AI.Do an inspection of the OD surface (area F) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-149
(2)Nicks and dents:
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 mid fan shaft.
Subtask 72-00-04-220-150
(3)Scratches:
Maximum serviceable limit:
Any amount, 0.001 inch (0.025 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 mid fan shaft.
Subtask 72-00-04-220-033
AJ.Do an inspection of all other areas of the mid fan shaft (81000) as follows. Refer to Figure 809.
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount 0.004 inch (0.10 mm) in depth.
Repair method:
Replace the mid fan shaft.
Subtask 72-00-04-220-140
AK.Do an inspection of all areas (do not include the coating) of the No. 4 bearing aft rotating seal (aft rotating seal) (35-380 , 72-00-02) (SIN 01406). Refer to Figure 812 and as follows:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the aft rotating seal.
Subtask 72-00-04-220-141
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
0.020 inch (0.51 mm) after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the aft rotating seal.
Subtask 72-00-04-220-142
AL.Do an inspection of the coating in area L of the aft rotating seal (35-380 , 72-00-02) (SIN 01406). Refer to Figure 812 and as follows:
(1)Rubs or grooves:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-58-45-300-801 (72-58-45, REPAIR 002).
Subtask 72-00-04-220-143
* * * FOR ALL.ALL
(2)Missing coating:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-58-45-300-801 (72-58-45, REPAIR 002).
Subtask 72-00-04-220-144
* * * FOR ALL.ALL
(1)Discoloration:
Maximum serviceable limit:
Any amount.
Repair method:
Replace the aft rotating seal.
Subtask 72-00-04-220-034
AM.Do an inspection of the stage 1 shroud for the features that follow (when visible and if the shroud is still mounted on the LPT case). Refer to Figure 810.
(1)Cracked honeycomb in area S:
Maximum serviceable limit:
Any amount is acceptable, provided that the honeycomb stays in place, without looseness can interfere with LPT rotor assembly.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-105
(2)Deleted.
Subtask 72-00-04-220-106
(3)Drooping/cracking in area A:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the rotor/stator assembly.
Subtask 72-00-04-220-113
AN.Do an inspection of the No. 5 bearing sump cover (0150C) as follows. Refer to Figure 802.
(1)External oil coking:
Maximum serviceable limit:
Any amount.
Repair method:
Replace the rotor/stator assembly.
* * * FOR ALL
Figure 810   Stage 1 Shroud Forward Rail - Inspection
Subtask 72-00-04-220-174
* * * PRE SB   72-0040
AO.Do an inspection of the stage 1 disk other area (does not include dovetail edge) for. Refer to Figure 811.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-00-04-220-175
(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 72-00-04-220-176
(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.
* * * END PRE SB   72-0040
Subtask 72-00-04-220-177
* * * PRE SB   72-0040
AP.Do an inspection of the stage 1 disk blade retainer hook for. Refer to Figure 811.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-00-04-220-178
(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 72-00-04-220-179
(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 72-00-04-220-180
(4)Wear:
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.
* * * END PRE SB   72-0040
Subtask 72-00-04-220-181
AQ.Do an inspection of the stage 1 to stage 5 disk bore for. Refer to Figure 811.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-00-04-220-182
(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 72-00-04-220-183
(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 72-00-04-220-184
AR.Do an inspection of the stage 1, stage 2, stage 3 and stage 5 disk hub and web for. Refer to Figure 811.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-00-04-220-185
(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 72-00-04-220-186
(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 72-00-04-220-187
AS.Do an inspection of the stage 4 disk hub and web for. Refer to Figure 811.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the disk.
Subtask 72-00-04-220-188
(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 72-00-04-220-189
* * * PRE SB   72-0040
(3)Dents for hub:
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.
* * * END PRE SB   72-0040
Subtask 72-00-04-220-190
* * * SB   72-0040
(3).A.Dents for hub:
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.
* * * END SB   72-0040
Subtask 72-00-04-220-191
(4)Dents for web:
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.
* * * FOR ALL
* * * PRE SB   72-0040
Figure 811   (Sheet 1 ) Stage 1 Disk - Inspection
* * * FOR ALL
* * * SB   72-0040
Figure 811   (Sheet 2 ) Stage 1 Disk - Inspection
* * * FOR ALL
* * * PRE SB   72-0040
Figure 811   (Sheet 3 ) Stage 2 Disk - Inspection
* * * FOR ALL
* * * SB   72-0040
Figure 811   (Sheet 4 ) Stage 2 Disk - Inspection
* * * FOR ALL
* * * PRE SB   72-0040
Figure 811   (Sheet 5 ) Stage 3 Disk - Inspection
* * * FOR ALL
* * * SB   72-0040
Figure 811   (Sheet 6 ) Stage 3 Disk - Inspection
* * * FOR ALL
* * * PRE SB   72-0040
Figure 811   (Sheet 7 ) Stage 4 Disk - Inspection
* * * FOR ALL
* * * SB   72-0040
Figure 811   (Sheet 8 ) Stage 4 Disk - Inspection
* * * FOR ALL
* * * PRE SB   72-0040
Figure 811   (Sheet 9 ) Stage 5 Disk - Inspection
* * * FOR ALL
* * * SB   72-0040
Figure 811   (Sheet 10 ) Stage 5 Disk - Inspection
5 . Special Dimensional Inspection.
Subtask 72-00-04-220-035
A.Deleted.
6 . Determine the Serviceability of the Mid Fan Shaft Due to Rub.
Subtask 72-00-04-220-107
A.Do this procedure only if the visual inspection showed that there was damage specified as rub on the mid fan shaft (81000).
NOTE:
Paint will look polished when the mid fan shaft is turned in the 9C1126G01   dolly, but this condition is not specified as rub.
Subtask 72-00-04-250-001
B.Do a serviceability inspection of the mid fan shaft (81000). Refer to TASK 70-32-16-250-001 (SERVICEABILITY INSPECTION OF THE FAN MID SHAFT).
Subtask 72-00-04-380-002
C.If the paint was removed from the mid fan shaft (81000) to do the serviceability inspection, apply C03-038  Paint to the mid fan shaft. Refer to TASK 70-43-05-380-005 (INORGANIC ALUMINUM PROTECTIVE COATING).
Subtask 72-00-04-160-001
WARNING:
DO NOT PERMIT NITRIC ACID OR ETCHING SOLUTION TO TOUCH YOUR SKIN. WEAR PROTECTIVE CLOTHING WHEN YOU MIX OR USE ETCHING SOLUTION.
WARNING:
ALWAYS ADD THE ACID TO THE ISOPROPYL ALCOHOL. NEVER ADD THE ISOPROPYL ALCOHOL TO THE ACID. A DANGEROUS CHEMICAL REACTION WILL RESULT IF THE SOLUTION IS MIXED INCORRECTLY.
D.Acid etch areas of rub on the mid fan shaft (81000) as follows:
WARNING:
NITRIC ACID IS TOXIC. DO NOT LET THIS MATERIAL TOUCH YOU. USE PERSONAL PROTECTION EQUIPMENT. USE VAPOR/FUME CONTROL OR A RESPIRATOR.
WARNING:
ISOPROPYL ALCOHOL IS TOXIC AND FLAMMABLE. USE PERSONAL PROTECTION EQUIPMENT. USE IN A WELL-VENTILATED AREA.
(1)Prepare the solution in a plastic container. Fully mix 12-15 percent C04-072  Acid with 85-88 percent C04-035  Solvent. Keep the mixture covered when not in use. Use in less than 24 hours.
WARNING:
ACETONE IS EXPLOSIVE, AN IRRITANT, AN ALLERGEN, AND HAS POISONOUS DETERIORATION. USE VAPOR/FUME CONTROL OR USE A RESPIRATOR.
(2)Clean the rubbed area with C04-003  Solvent .
WARNING:
ACETONE IS EXPLOSIVE, AN IRRITANT, AN ALLERGEN, AND HAS POISONOUS DETERIORATION. USE VAPOR/FUME CONTROL OR USE A RESPIRATOR.
(3)Polish the rubbed area with emery cloth. Use grits of increasing fineness. The final polish must be done with emery cloth moistened with C04-003  Solvent.
CAUTION:
DO NOT RUB THE SOLUTION ON THE MID FAN SHAFT. THE AREA OF INSPECTION WILL NOT CHANGE COLOR CORRECTLY.
(4)Apply the solution to the polished area with a cotton swab. Do not rub the solution on the shaft. Make sure the solution is not more than 24 hours old. The solution should fully cover the polished surface. Apply the solution for 2-3 minutes or until the area becomes very dark in color. The dark color shows that there is a rub condition.
(5)Rinse the solution from the mid fan shaft with clean water and dry it with clean shop air or a cloth.
Subtask 72-00-04-220-036
E.Do a visual inspection of the etched area.
(1)The mid fan shaft (81000) is serviceable if the color of the etched area is the same as the other areas of the fan mid shaft.
(2)The mid fan shaft (81000) is not serviceable if the color of the etched area is lighter than the other areas of the fan mid shaft.
7 . Paint the Fan Mid Shaft.
Subtask 72-00-04-380-001
A.If the paint was removed from the mid fan shaft (81000) to do the visual inspection, apply C03-038  Paint to the mid fan shaft. Refer to TASK 70-43-05-380-005 (INORGANIC ALUMINUM PROTECTIVE COATING).
* * * FOR ALL
Figure 812   Aft Rotating Seal - Inspection