* * * FOR ALL
TASK 72-31-42-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the high pressure compressor (HPC) stage 2 blisk (blisk):
•
(01-740 , 72-31-00) (SIN 056A2)
•
(02-740 , 72-31-00) (SIN 056A2) (SB 72-0157 )
•
(02-740A , 72-31-00) (SIN 056A2) (SB 72-0157 ).
B.Use the 11C4482   lift fixture to position, lift, or turn the blisk in the working area. Refer to Subtask 72-31-42-420-001 (paragraph 3.A.) for instructions about installation and removal of the tool.
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
 
11C4482G02
Fixture, Lift/Turn - HP Compressor Rotor, Stage 2 Blisk (lift fixture)
 
9429M77G04
Fixture, Lift and Turn - General Purpose (lift/turn fixture)
(2)Standard Tools and Equipment.
 
Tool No.
Manufacturer
 
High-Speed Eddy Current
Fixture and Probe
Adapter for Rohman
High-Speed Rotors
(HF and STD Models)
(GE-FQAP-302 inspection kit)
GE Aircraft Engines, QTC
Attention: Brenda Tenley
One Neumann Way, MD: Q8
Cincinnati, Ohio 45215
Phone: (513) 552-4701
Fax: (513) 552-4892
E-mail: brenda.tenley@ae.ge.com
 
High-Speed Eddy Current
Fixture and Probe
Adapter for Staveley
High-Speed Rotor
(RA 19 Model)
(GE-FQAP-302A inspection kit)
 
High-Speed Eddy
Current Fixture for
Hocking High-Speed Rotor
(Model 33A022 and 33A106)
and Nortec Spitfire
2000 Rotator, P/N 9020206.00
(GE-FQAP-302B inspection kit)
 
High-Speed Eddy Current
Fixture for the Forster
High-Speed Rotor
(Model 2.877.01-1002
and 2.877.02-1002)
(GE-FQAP-302C inspection kit)
 
Eddy Current
Inspection kit
(GE-FQAP-428)
GE Aviation
Field Support Technology
One Neumann Way, MD: Q8
Cincinnati, Ohio 45215
E-mail: ndttooling@ge.com
Fax: (513) 552-1386
 
Eddy Current Inspection Kit
(GE-FQAP-605 inspection kit)
GE Aircraft Engines, QTC
Attention: Brenda Tenley
One Neumann Way, MD: Q8
Cincinnati, Ohio 45215
Phone: (513) 552-4701
Fax: (513) 552-4892
E-mail: brenda.tenley@ae.ge.com
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C04-166
Shot, Peening, Conditioned Cut Wire (GE Spec. D50TF11 CL-B, AMS 2431/8)
 
C04-271
Cast Steel Shot
 
C10-010
Scotch Brite Pads (No. 7447 (Scotch Brite Pad)
C.Referenced Procedures.
 
ATA No.
Description
 
70-22-06
Special Cleaning Procedure 6 - Bolthole Cleaning for Eddy Current Inspection
 
70-32-02
Fluorescent Penetrant Inspection
 
70-32-07
High Speed and Slow Speed Eddy Current Inspection of Circular Holes in Inconel or Titanium Engine Parts
 
70-32-10
2 MHz Eddy Current Inspection of Bores in Inconel Alloy Rotating Engine Hardware Using Systems Under Computer, Numeric, or Robotic Control
 
70-33-03
Special Inspection for Surface Fretting or Galling
 
70-42-00
Blending and Removal of High Metal Procedures
 
72-31-42
Cleaning 001
D.Expendable Parts. None.
3 . Tool Installation and Removal.
Subtask 72-31-42-420-001
A.Install the 11C4482   lift fixture. Refer to Figure 801 and do as follows:
(1)Turn the knobs (item 15) and screw knobs (item 5) counterclockwise (CCW) to make sure that the supports (item 12) are open.
(2)Install the supports (item 12) on the blisk.
(3)Install the clamps (item 13) on the other side of the blisk.
(4)Make sure that the clamps (item 13) are aligned with the supports (item 12).
(5)Tighten the screw knobs (item 5) to set the supports (item 12) and hand-tighten the knobs (item 15) clockwise (CW) until the supports (item 12) and clamps (item 13) are tightly held in place.
(6)Install the 9429M77   lift/turn fixture as follows:
(a)Put the lock plate adapter (item 13) on the trunnion (item 6) and attach it with the release pin (item 19).
(7)Use the 9429M77   lift/turn fixture to move the 11C4482   lift fixture.
Subtask 72-31-42-020-001
B.Remove the 11C4482   lift fixture. Refer to Figure 801 and do as follows:
(1)Remove the 9429M77   lift/turn fixture from the 11C4482   lift fixture as follows:
(a)Remove the release pin (item 19) and lock plate adapter (item 13) from the 11C4482   lift fixture.
(2)Turn the knobs (item 15) and the screw knobs (item 5) CCW to open the set of supports (item 12) and clamps (item 13).
(3)Remove the 11C4482   lift fixture from the blisk.
* * * FOR ALL
Figure 801   (Sheet 1 ) Installation/Removal of the Lift Fixture, 11C4482, on the Blisk
* * * FOR ALL
Figure 801   (Sheet 2 ) Installation/Removal of the Lift Fixture, 11C4482, on the Blisk
4 . 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 72-31-42-230-001
WARNING:
ALWAYS USE APPROVED EQUIPMENT AND PROCEDURES TO LIFT PARTS. STAY OUT FROM BELOW LOADS. IF THE PARTS ACCIDENTALLY MOVE OR FALL, THEY CAN CAUSE AN INJURY OR KILL YOU.
WARNING:
BECAUSE OF ENGINE OPERATION, THE AIRFOIL TIPS CAN HAVE SHARP EDGES AND CORNERS. BE CAREFUL AND USE APPROPRIATE PROTECTIVE EQUIPMENT TO PREVENT INJURY.
A.Do a Class G non-aqueous wet developer fluorescent penetrant inspection of the blisk. Refer to TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION).
(1)Make sure you do a careful inspection of the critical areas that follows:
•
Disk bore
•
Boltholes
•
Fillets
•
Airfoil.
(2)Indications 0.015 inch (0.38 mm) or less are permitted.
Subtask 72-31-42-250-001
B.Do an eddy current inspection of the blisk boltholes as follows. Refer to Figure 802.
Subtask 72-31-42-160-002
CAUTION:
DO NOT USE METAL BRUSHES TO CLEAN THE STAGE 2 BLISK BOLTHOLES. METAL BRUSHES CAN CAUSE SCRATCHES. SCRATCHES CAN CAUSE THE BOLTHOLES TO BE REJECTED DURING THE EDDY CURRENT INSPECTION.
(1)Make sure that the boltholes are clean. Refer to 72-31-42-100-801 (72-31-42, CLEANING 001) and TASK 70-22-06-110-043 (SPECIAL CLEANING PROCEDURE 6 - BOLTHOLE CLEANING FOR EDDY CURRENT INSPECTION).
NOTE:
It is recommended that you use a stiff nylon bottle brush to remove surface oxide and/or unwanted materials from the bolthole surfaces.
Subtask 72-31-42-250-002
(2)Do an eddy current inspection of the boltholes as follows. Refer to TASK 70-32-07-250-001 (HIGH SPEED AND SLOW SPEED EDDY CURRENT INSPECTION OF CIRCULAR HOLES IN INCONEL OR TITANIUM ENGINE PARTS).
NOTE:
This inspection can only be done by identified and approved persons. You cannot accept or reject components until you have been approved.
(a)(a) If you change the equipment or the procedure specified in this inspection, it can have an unwanted effect on the inspection results. Before you change the equipment or the procedure, write to:
GE Aircraft Engines, OTC
One Neumann Way, MD: Q8
Cincinnati, Ohio 45215
USA
(b)Do an inspection of the boltholes as follows:
1Use the GE-FQAP-605 inspection kit with either the GE-FQAP-302 inspection kit, GE-FQAP-302A inspection kit, GE-FQAP-302B inspection kit, or GE- FQAP-302C inspection kit.
2Use the filter settings that follow:
•
1000 Hz band pass filter frequency for Rohmann B1 equipment
•
500 Hz high pass filter frequency with a low pass of 1.25 kHz for Rohmann B1V3/V4 equipment
•
350 Hz high pass filter frequency with a low pass of 500 Hz for Stavely NDT 19 and Nortec 24 equipment
•
250 Hz high pass filter frequency with a low pass of 1.5 kHz for Hocking Phasec 1.1 equipment
•
400 Hz high pass filter frequency with a low pass of 2 kHz for Hocking 2200 equipment
•
300 Hz high pass filter frequency with a low pass of 1 kHz for Forster AF 2.833 equipment
•
350 Hz high pass filter frequency with a low pass of 500 Hz for Stavely Nortec 2000 equipment.
3The calibration amplitude is four divisions, peak to peak.
(c)Complete the eddy current data sheets. If eddy current indications are found that are equal to or greater than four major divisions, the stage 2 blisk is not serviceable.
(d)Make sure that all records made during the eddy current inspection are as complete as possible. Keep all records made during the inspection.
Subtask 72-31-42-250-003
C.Do an eddy current inspection of the blisk bores as follows. Refer to Figure 803.
Subtask 72-31-42-100-001
(1)Clean the blisk bore. Refer to TASK 72-31-42-100-801 (72-31-42, CLEANING 001).
Subtask 72-31-42-250-004
(2)Do an eddy current inspection of the blisk bore surfaces. Refer to TASK 70-32-10-250-003 (2 MHZ EDDY CURRENT INSPECTION OF BORES IN ROTATING ENGINE HARDWARE USING SYSTEMS UNDER COMPUTER, NUMERIC, OR ROBOTIC CONTROL).
NOTE:
Only trained, identified, and approved personnel for these inspections can do these tests. The authority to accept/reject hardware will not be given to the inspectors until they are certified. They must be able to do the necessary calibration and inspection procedures and correctly read the inspection results.
NOTE:
Changes to the procedure or substitutions of the equipment can cause a lower detection of cracks. To do or use something different, the new procedure and equipment must be evaluated by the GE Aviation.
NOTE:
Material is Ti 6-4. Use correction factors for calibration as appropriate. Refer to TASK 70-32-10-250-003 (2 MHZ EDDY CURRENT INSPECTION OF BORES IN ROTATING ENGINE HARDWARE USING SYSTEMS UNDER COMPUTER, NUMERIC, OR ROBOTIC CONTROL).
(a)Inspect the bore areas shown in the scan plan.
(b)Complete the eddy current data sheets. Refer to Figure 804.
(c)Eddy current inspection evaluation limit is 1500 mV.
(d)Eddy current inspection reject limit is 1500 mV after evaluation is completed.
(e)All blisks that are rejected by the limit in Subtask 72-31-42-250-004 (paragraph 3.C.(2)(d)) are not serviceable.
(f)All blisks that are not rejected by the limits in Subtask 72-31-42-250-004 (paragraph 3.C.(2)(d)) are serviceable.
(g)Make sure that all records made during the eddy current inspection are as complete as possible. Permanently keep these records for each blisk that was inspected.
* * * FOR ALL
Figure 802   Eddy Current Inspection
* * * FOR ALL
Figure 803   HPC Rotor Stage 2 Blisk - Eddy Current Bore Inspection Plan
* * * FOR ALL
Figure 804   HPC Rotor Stage 2 Blisk - Eddy Current Bore Inspection - Calibration and Inspection Log
5 . Visual Inspection.
Refer to Figure 805.
Subtask 72-31-42-220-003
A.Do an inspection of all areas for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
* * * FOR ALL
Figure 805   (Sheet 1 ) Blisk - Inspection Areas
* * * FOR ALL
Figure 805   (Sheet 2 ) Blisk - Inspection Areas
* * * FOR ALL
Figure 805   (Sheet 3 ) Blisk - Inspection Areas
Subtask 72-31-42-220-004
B.Do an inspection of area A (critical) for. Refer to Figure 805 and Figure 806.
(1)Nicks, dents, and pits in the fillet:
Maximum serviceable limit:
Any amount 0.001 inch (0.03 mm) in depth and 0.020 inch (0.51 mm) in length or diameter.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-038
(2)Scratches in the fillet:
Maximum serviceable limit:
Any amount 0.001 inch (0.03 mm) in depth, any length.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-039
(3)Tears and cracks in the fillet:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-040
(4)Nicks, dents, and pits on the leading and trailing edges:
Maximum serviceable limit:
Any amount 0.005 inch (0.13 mm) in depth.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-041
(5)Tears and cracks on the leading and trailing edges:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-042
(6)Deposits on the leading and trailing edges:
Maximum serviceable limit:
Any amount 0.005 inch (0.13 mm) in thickness.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-043
(7)Scratches in area A above the root fillet:
Maximum serviceable limit:
Any amount 0.002 inch (0.05 mm) in depth and 0.100 inch (2.54 mm) in length.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-044
(8)Bulge deformation on the leading and trailing edges:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-005
C.Do an inspection of area B (leading and trailing edges) on the blisk blade for:
(1)Nicks:
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:
Blend the damage. Refer to TASK 72-31-42-300-801 (72-31-42, REPAIR 001) .
Subtask 72-31-42-220-006
NOTE:
Shallow or small wavy areas at the leading and trailing edges are normal and must not be interpreted as dents.
(2)Dents and pits:
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) , with a root radius not less than 0.02 inch (0.5 mm), and more than 0.40 inch (10.2 mm) between defects.
Repair method:
Blend the damage. Refer to TASK 72-31-42-300-801 (72-31-42, REPAIR 001) .
Subtask 72-31-42-220-007
(3)Scratches and gouges:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth, and 0.157 inch (3.99 mm) in length, after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Blend the damage. Refer to TASK 72-31-42-300-801 (72-31-42, Repair 001) .
Subtask 72-31-42-220-008
(4)Deposits:
Maximum serviceable limit:
0.005 inch (0.13 mm) in thickness.
Repair method:
Blend the damage. Refer to TASK 72-31-42-300-801 (72-31-42, Repair 001) .
Subtask 72-31-42-220-009
(5)Metal splatter deposits:
Maximum serviceable limit:
0.005 inch (0.13 mm) in thickness.
Repair method:
Blend the damage. Refer to TASK 72-31-42-300-801 (72-31-42, Repair 001) .
Subtask 72-31-42-220-010
(6)Erosion on the leading edge:
Maximum serviceable limit:
Any amount if in dimensional limits of Subtask 72-31-42-220-031 (paragraph 5.A.).
Repair method:
Replace the blisk.
Subtask 72-31-42-220-011
(7)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-012
(8)Bulge deformation:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-061
(9)Tears:
Maximum serviceable limit:
Not serviceable.
Repair method:
Blend the damage. Refer to TASK 72-31-42-300-801 (72-31-42, Repair 001) .
Subtask 72-31-42-220-013
D.Do an inspection of area C (concave and convex airfoil contour surfaces) of the blisk blade for:
(1)Nicks, dents, and pits:
Maximum serviceable limit:
Any amount, 0.003 inch (0.08 mm) in depth, 0.020 inch (0.51 mm) in length or in diameter. Defects at the same location on opposite sides of the airfoil are not permitted.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-014
(2)Scratches:
Maximum serviceable limit:
Any amount, 0.003 inch (0.08 mm) in depth, any length.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-015
(3)Metal splatter deposits:
Maximum serviceable limit:
0.005 inch (0.13 mm) in thickness.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-016
E.Do an inspection of the airfoil for:
(1)Bent airfoil:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-017
F.Do an inspection of the flowpath surface of the blisk for:
(1)Nicks, dents, pits, and scratches:
Maximum serviceable limit:
Any amount, 0.003 inch (0.07 mm) in depth, any length.
Repair method:
Repair. Refer to TASK 72-31-42-300-802 (72-31-42, REPAIR 003).
Subtask 72-31-42-220-018
G.Do an inspection of the squealer tip of the blisk blade for. Refer to Figure 807.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-046
(2)Nicks and dents:
Maximum serviceable limit:
Any amount 0.003 inch (0.08 mm) in depth.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-019
(3)Tip rub:
NOTE:
Tip rub indications must lead to tip height inspection, as described in paragraph 6: Special Dimensional Inspection.
Maximum serviceable limit:
Any amount if in the dimensional limits. Refer to Subtask 72-31-42-220-031 (paragraph 5.A.) .
Repair method:
Replace the blisk.
Subtask 72-31-42-220-020
(4)Burrs and high metal:
NOTE:
Tip burrs and high metal must lead to tip height inspection, as described in paragraph 6: Special Dimensional Inspection.
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Blend to remove burrs and high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Blend to remove burrs and high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-31-42-220-021
(5)Heat discoloration caused by tip rub:
NOTE:
Tip discoloration caused by tip rub must lead to tip height inspection, as described in paragraph 6: Special Dimensional Inspection.
NOTE:
Clean airfoils before heat discoloration inspection. Abrasive cleaning methods must not be used on airfoils, as they might make discoloration inspection more difficult.
NOTE:
Discoloration with tip contact marks (rubs, burrs) is rejectable. Discoloration with no tip contact marks (rubs, burrs) is acceptable.
NOTE:
All airfoil tips must be inspected. Even one each airfoil with tip contact mark can lead to tip discoloration.
Maximum serviceable limit:
Any color or amount that is less than 0.05 inch (1.3 mm) from the blisk blade tip.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-022
(6)Deposits:
Maximum serviceable limit:
0.005 inch (0.13 mm) in thickness.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-023
(7)Bending and curling of the squealer tip:
Maximum serviceable limit:
10 percent of chord and 10 percent of span if there are no cracks. Three blades maximum permitted a minimum of 60 degrees apart.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-024
(8)Erosion:
Maximum serviceable limit:
Any amount if in the dimensional limits of Subtask 72-31-42-220-031 (paragraph 5.A.) .
Repair method:
Replace the blisk.
Subtask 72-31-42-220-026
H.Do an inspection of the tip corners of the blisk for:
(1)Damage:
Maximum serviceable limit:
Not serviceable.
Repair method:
Blend the damage. Refer to TASK 72-31-42-300-801 (72-31-42 Repair 001) .
Subtask 72-31-42-220-027
I.Do an inspection of the boltholes for:
(1)Nicks, dents, and scratches on the inner diameter:
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 blisk.
Subtask 72-31-42-220-028
(2)Nicks, dents, and scratches on the chamfers:
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 blisk.
Subtask 72-31-42-220-029
(3)Fretting, galling, or wear:
Maximum serviceable limit:
Any amount if in the limits of TASK 70-33-03-220-006 (SPECIAL INSPECTION FOR SURFACE FRETTING OR GALLING) .
Repair method:
Replace the blisk.
Subtask 72-31-42-220-047
J.Do an inspection of the bolt pads for. Refer to Figure 805.
(1)Fretting or galling:
Maximum serviceable limit:
Any amount, if in the limits of TASK 70-33-03-220-006 (SPECIAL INSPECTION FOR SURFACE FRETTING OR GALLING) .
Repair method:
Replace the blisk.
Subtask 72-31-42-220-048
(2)Nicks, dents, pits, and scratches:
Maximum serviceable limit:
Any amount, 0.001 inch (0.02 mm) in depth, after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-31-42-300-802 (72-31-42, REPAIR 003).
Subtask 72-31-42-220-066
(3)Nicks, dents, pits, and scratches in area CD in 0.070 inch (1.80 mm) of the bolthole chamfers:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-079
(4)Fretting in area CD in 0.070 inch (1.80 mm) of the bolthole chamfers (does not include chamfers):
Maximum serviceable limit:
Any amount, 0.003 inch (0.07 mm) in depth, after the removal of high metal.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-049
K.Do an inspection on forward and aft damper tabs for:
(1)Fretting or galling on aft damper tab:
Maximum serviceable limit:
Any amount, if in the limits of TASK 70-33-03-220-006 (SPECIAL INSPECTION FOR SURFACE FRETTING OR GALLING) .
Repair method:
Replace the blisk.
Subtask 72-31-42-220-080
(2)Fretting or galling on forward damper tab (area D). Refer to Figure 805:
Maximum serviceable limit:
Any amount, 0.006 inch (0.15 mm) in depth, after the removal of high metal.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-050
(3)Nicks, dents, pits, and scratches:
Maximum serviceable limit:
Any amount, 0.002 inch (0.05 mm) in depth, after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-31-42-300-802 (72-31-42, REPAIR 003).
Subtask 72-31-42-220-030
L.Do an inspection of the disk bore for:
(1)Nicks, dents, pits, or scratches:
Maximum serviceable limit:
Any amount, 0.002 inch (0.05 mm) in depth, after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-31-42-300-802 (72-31-42, REPAIR 003).
Subtask 72-31-42-220-067
M.Do an inspection of the disk webs for:
(1)Nicks, dents, pits, or scratches:
Maximum serviceable limit:
Any amount, 0.001 inch (0.02 mm) in depth, after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-31-42-300-802 (72-31-42, REPAIR 003).
Subtask 72-31-42-220-068
N.Do an inspection of the disk forward and aft rabbet for:
(1)Gouges, nicks, dents, pits, and scratches:
Maximum serviceable limit:
Any amount, 0.003 inch (0.07 mm) in depth, after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-31-42-300-802 (72-31-42, REPAIR 003).
Subtask 72-31-42-220-069
(2)Nicks, dents, pits, or scratches in the rabbet fillets:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-42-220-070
O.Deleted.
(1)Deleted.
Maximum serviceable limit:
Deleted.
Repair method:
Deleted.
Subtask 72-31-42-220-071
(2)Deleted.
Maximum serviceable limit:
Deleted.
Repair method:
Deleted.
Subtask 72-31-42-220-072
P.Do an inspection of the disk forward lower fillet (area XX) for:
(1)Nicks, dents, pits, or scratches:
Maximum serviceable limit:
Any amount, 0.001 inch (0.02 mm) in depth, after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-31-42-300-802 (72-31-42, REPAIR 003).
Subtask 72-31-42-220-073
Q.Do an inspection of the disk aft lower fillet (area AH) for:
(1)Nicks, dents, pits, or scratches:
Maximum serviceable limit:
Any amount, 0.003 inch (0.07 mm) in depth, after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-31-42-300-802 (72-31-42, REPAIR 003).
Subtask 72-31-42-220-074
R.Do an inspection of all other areas on the disk portion of the part (does not include airfoils or flowpath) for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.003 inch (0.07 mm) in depth, after the removal of high metal.
Repair method:
Repair. Refer to TASK 72-31-42-300-802 (72-31-42, REPAIR 003).
* * * FOR ALL
Figure 806   Definition of Root Fillet
* * * FOR ALL
Figure 807   Examples of Tip Contact Marks
6 . Special Dimensional Inspection.
Subtask 72-31-42-220-062
A.Deleted.
Subtask 72-31-42-220-031
B.Measure all dimensions with diameter Y held within serviceable limits and surface X held flat to 0.001 inch (0.03 mm).
Subtask 72-31-42-220-033
C.Measure the dimensions as follows:
(1)Diameter AY:
Minimum serviceable limit:
15.398 inches (391.11 mm).
Maximum serviceable limit:
15.402 inches (391.21 mm).
Repair method:
Replace the blisk.
Subtask 72-31-42-220-035
(2)Diameter Y:
Minimum serviceable limit:
15.652 inches (397.56 mm).
Maximum serviceable limit:
15.656 inches (397.66 mm).
Repair method:
Replace the blisk.
Subtask 72-31-42-220-051
* * * PRE SB   72-0157( HPC Rotor Hardware Release for Non PIP 2 Engines )
(3)Radius TH1 in relation with surface X and diameter Y:
NOTE:
Do this special dimensional inspection only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 808.
Minimum serviceable limit:
14.224 inches (361.29 mm).
Repair method:
Replace the blisk.
* * * END PRE SB   72-0157
Subtask 72-31-42-220-077
* * * SB   72-0157
(3).A.Radius TH1 in relation with surface X and diameter Y:
NOTE:
Do this special dimensional inspection only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 808.
Minimum serviceable limit:
14.225 inches (361.32 mm).
Repair method:
Replace the blisk.
* * * END SB   72-0157
Subtask 72-31-42-220-052
* * * PRE SB   72-0157( HPC Rotor Hardware Release for Non PIP 2 Engines )
(4)Radius TH2 in relation with surface X and diameter Y:
NOTE:
Do this special dimensional inspection only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 808.
Minimum serviceable limit:
14.167 inches (359.84 mm).
Repair method:
Replace the blisk.
* * * END PRE SB   72-0157
Subtask 72-31-42-220-078
* * * SB   72-0157
(4).A.Radius TH2 in relation with surface X and diameter Y:
NOTE:
Do this special dimensional inspection only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 808.
Minimum serviceable limit:
14.171 inches (359.95 mm).
Repair method:
Replace the blisk.
* * * END SB   72-0157
Subtask 72-31-42-220-053
(5)Dimension B at radius of 13.850 inch (351.79 mm):
NOTE:
Do this special dimensional inspection only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 808.
Minimum serviceable limit:
2.907 inches (73.84 mm).
Repair method:
Replace the blisk.
Subtask 72-31-42-220-054
* * * PRE SB   72-0157( HPC Rotor Hardware Release for Non PIP 2 Engines )
(6)Dimension LE of the leading edge thickness:
NOTE:
Do this special dimensional inspection only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 808.
Minimum serviceable limit:
0.020 inch (0.51 mm).
Repair method:
Replace the blisk.
* * * END PRE SB   72-0157
Subtask 72-31-42-220-075
* * * SB   72-0157( HPC Rotor Hardware Release for PIP 2 Engines )
(6).A.Blisk (02-740 , 72-31-00) (SIN 056A2):
NOTE:
Do this special dimensional inspection only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 808.
(a)Dimension LE of the leading edge thickness:
Minimum serviceable limit:
0.014 inch (0.36 mm).
Repair method:
Replace the blisk.
Subtask 72-31-42-220-076
(6).B.Blisk (02-740A , 72-31-00) (SIN 056A2):
NOTE:
Do this special dimensional inspection only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 808.
(a)Dimension LE of the leading edge thickness:
Minimum serviceable limit:
0.016 inch (0.41 mm).
Repair method:
Replace the blisk.
* * * END SB   72-0157
Subtask 72-31-42-220-055
(7)Dimension TE of the leading edge thickness:
NOTE:
Do this special dimensional inspection only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 808.
Minimum serviceable limit:
0.022 inch (0.56 mm).
Repair method:
Replace the blisk.
* * * FOR ALL
Figure 808   Blisk - Dimensional Inspection