* * * FOR ALL
TASK 72-31-41-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the HPC stage 1 blisk (blisk):
•
(01-800 , 72-31-00) (SIN 056A1)
•
(02-800 , 72-31-00) (SIN 056A1) (SB 72-0157 ).
B.Use the 11C3361   lift fixture to position, lift, or turn the blisk in the working area. Refer to Subtask 72-31-41-420-002 (paragraph 3.) 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
 
11C3361G01
Fixture, Lift/Turn HP Compressor Rotor, Stage 1 Blisk (lift fixture)
 
9429M77G04
Fixture, Lift and Turn - General Purpose (lift/turn fixture)
(2)Standard Tools and Equipment.
 
Tool No.
Description
 
Eddy Current
GE Aircraft Engines, QTC
 
Inspection Kit
Attention: Brenda Tenley
 
(GE-FQAP-428)
One Neumann Way, MD: Q8
 
Cincinnati, Ohio 45215
 
Phone: (513) 552-4701
 
Fax: (513) 552-4892
 
Email: brenda.tenley@ae.ge.com
(3)Locally Manufactured Tools. None.
B.Consumable Materials. None.
C.Referenced Procedures.
 
ATA No.
Description
 
70-32-02
Fluorescent Penetrant Inspection
 
70-32-10
2 MHz Eddy Current Inspection Of Bores In Rotating Engine Hardware Using Systems Under Computer, Numeric, Or Robotic Control
 
70-33-03
Special Inspection for Surface Fretting or Galling
 
72-31-41
Cleaning 001
D.Expendable Parts. None.
3 . Tool Installation and Removal.
Subtask 72-31-41-420-002
A.Install the 11C3361   lift fixture. Refer to Figure 801 and do as follows:
(1)Move the clamp (item 3) in, before the mounting plate (item 2) is installed on the blisk.
(2)Install the mounting plate (item 2) on the forward flange of the blisk.
WARNING:
ENSURE THE CLAMP ENGAGES THE BLISK FLANGE AND THE THUMB SCREW IS INSTALLED IN THE POCKET OF THE MOUNTING PLATE. FAILURE TO COMPLY CAN CAUSE STAGE 1 BLISK TO DROP AND CAUSE INJURY OR DEATH OF PERSONNEL.
(3)Move the clamp (item 3) out to lock on the lip of the blisk flange in the groove of the clamp (item 3).
(4)Manually turn the thumb screw (item 11) to adjust it until there is no clearance between the clamp (item 3) jaw and the blisk flange.
(5)Make sure that the thumb screw (item 11) is correctly installed in the pocket of the mounting plate (item 2).
(6)Turn the knurled knob (item 10) to attach it the clamp (item 3).
(7)Set the lock pad (item 5) on the mounting plate (item 2) as follows:
(a)Move the trunnion (item 4) to the top position in the slot of the mounting plate (item 2).
(b)Lock the trunnion (item 4) with the lock pad (item 5) in the top position.
(c)Release the plunger (item 9) to move the lock pad (item 5).
(d)Engage the plunger (item 9) in the related mounting plate (item 2) hole to keep the lock pad (item 5) in position.
(8)Use the 9429M77   lift/turn fixture to move the 11C3361   lift fixture.
Subtask 72-31-41-020-002
B.Remove the 11C3361   lift fixture. Refer to Figure 801 and do as follows:
(1)Loosen the knurled knob (item 10) to release the clamp (item 3).
(2)Loosen the thumb screw (item 11) until is released from the pocket of the mounting plate (item 2).
(3)Move the clamp (item 3) in to release the lip of the blisk flange out of the groove of the clamp (item 3).
(4)Remove the mounting plate (item 2) from the blisk.
* * * FOR ALL
Figure 801   (Sheet 1 ) Installation/Removal of the Lift Fixture, 11C3361, on the Blisk
* * * FOR ALL
Figure 801   (Sheet 2 ) Installation/Removal of the Lift Fixture, 11C3361, 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 72-31-41-230-001
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 follow:
•
Bore
•
Boltholes
•
Aft flange scallop
•
Fillets
•
Seal teeth
•
Web
•
Airfoil root fillets.
(2)Indications 0.015 inch (0.38 mm) or less are permitted.
Subtask 72-31-41-160-002
B.Do an eddy current inspection of the blisk bore surfaces as follows:
CAUTION:
DO NOT USE METAL BRUSHES TO CLEAN THE BLISK BORES. METAL BRUSHES CAN CAUSE SCRATCHES. SCRATCHES CAN CAUSE THE BORE SURFACES TO BE REJECTED DURING THE EDDY CURRENT INSPECTION.
(1)Make sure the blisk is clean. Refer to 72-31-41-100-801 (72-31-41, Cleaning 001).
Subtask 72-31-41-250-001
(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) and Figure 802.
NOTE:
This inspection can only be done by identified and approved persons. You cannot accept or reject components until you have been approved.
(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)The material is Ti 6-4. Use correction factors for calibration as necessary. 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).
(c)Use the GE-FQAP-428inspection kit to do an inspection of the bore zones shown in Figure 802.
(d)Examine the inspection results. Use the limits that follow:
1The eddy current inspection limit is 1500 mV.
2If the amplitude of an indication is more than 1500 mV, the fan disk is not serviceable.
(e)Complete the eddy current data sheets.
(f)Make sure you complete all records during the eddy current inspection. Keep all records made during the inspection.
* * * FOR ALL
Figure 802   Eddy Current Inspection
5 . Visual Inspection.
Refer to Figure 803.
Subtask 72-31-41-220-001
A.Do an inspection of all areas for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
* * * FOR ALL
Figure 803   Blisk - Inspection Area
Subtask 72-31-41-220-002
B.Do an inspection of area A (critical) for. Refer to Figure 803 and Figure 804.
(1)Nicks, dents, and pits in the root 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 72-31-41-220-043
(2)Scratches in the root fillet:
Maximum serviceable limit:
Any amount 0.001 inch (0.03 mm) in depth, any length.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-044
(3)Tears and cracks in the fillet:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-045
(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 72-31-41-220-046
(5)Tears and cracks on the leading and trailing edges:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-047
(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 72-31-41-220-048
(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 72-31-41-220-049
(8)Bulge deformation on the leading and trailing edges:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-003
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 72-31-41-300-801 (72-31-41, REPAIR 001).
Subtask 72-31-41-220-004
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, 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 72-31-41-300-801 (72-31-41, REPAIR 001).
Subtask 72-31-41-220-005
(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 72-31-41-300-801 (72-31-41, REPAIR 001).
Subtask 72-31-41-220-006
(4)Deposits:
Maximum serviceable limit:
0.005 inch (0.13 mm) in thickness.
Repair method:
Blend the damage. Refer to TASK 72-31-41-300-801 (72-31-41, REPAIR 001).
Subtask 72-31-41-220-007
(5)Metal splatter deposits:
Maximum serviceable limit:
0.005 inch (0.13 mm) in thickness.
Repair method:
Blend the damage. Refer to TASK 72-31-41-300-801 (72-31-41, REPAIR 001).
Subtask 72-31-41-220-008
(6)Erosion on the leading edge:
Maximum serviceable limit:
Any amount if in dimensional limits of Subtask 72-31-41-220-033 (paragraph 5.).
Repair method:
Replace the blisk.
Subtask 72-31-41-220-009
(7)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-010
(8)Bulge deformation:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-066
(9)Tears:
Maximum serviceable limit:
Not serviceable.
Repair method:
Blend the damage. Refer to TASK 72-31-41-300-801 (72-31-41, REPAIR 001).
Subtask 72-31-41-220-011
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 72-31-41-220-012
(2)Scratches:
Maximum serviceable limit:
Any amount 0.003 inch (0.08 mm) in depth, any length.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-013
(3)Metal splatter deposits:
Maximum serviceable limit:
0.005 inch (0.13 mm) in thickness.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-014
E.Do an inspection of the airfoil for:
(1)Bent airfoil:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-015
F.Do an inspection of the flowpath surface of the blisk (does not include root fillet) for:
(1)Nicks, dents, pits, and scratches:
Maximum serviceable limit:
Any amount 0.003 inch (0.08 mm) in depth, any length.
Repair method:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-016
G.Do an inspection of the squealer tip of the blisk blade for. Refer to Figure 805.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-051
(2)Nicks and dents:
Maximum serviceable limit:
Any amount 0.003 inch (0.08 mm) in depth.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-017
(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 in the dimensional limits of Subtask 72-31-41-220-041 (paragraph 5.B).
Repair method:
Replace the blisk.
Subtask 72-31-41-220-018
(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:
Any amount.
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 72-31-41-220-019
(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 the 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 72-31-41-220-020
(6)Deposits:
Maximum serviceable limit:
0.005 inch (0.13 mm) in thickness.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-021
(7)Bending and curling of the squealer tip:
Maximum serviceable limit:
10 percent of the chord and 10 percent of the span, if there are no cracks. Three blades maximum permitted, a minimum of 60 degrees apart.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-022
(8)Erosion:
Maximum serviceable limit:
Any amount if in the dimensional limits of Subtask 72-31-41-220-033 (paragraph 5.).
Maximum repairable limit:
Not repairable.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-024
H.Do an inspection of the tip corners of the blisk for:
NOTE:
Some airfoil tip corners can be chamfered at the leading edge up to 0.079 inch by 0.079 inch (2.00 mm by 2.00 mm). The chamfers are used to identify blades with tip notches. This condition is fully serviceable and it's not the same as missing corners.
* * * PRE SB   72-0013( Old Design for the Stage 1 Blisk )
(1)Tip corners that are missing on leading edge:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
* * * END PRE SB   72-0013
Subtask 72-31-41-220-067
* * * SB   72-0013( New Design for the Stage 1 Blisk )
(1).A.Missing leading edge tip corners:
Maximum serviceable limit:
Not more than 0.140 inch (3.56 mm) radially and 0.030 inch (0.76 mm) axially can be missing after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum serviceable limit:
Not more than 3 damaged blades total and not more than 2 adjacent blades can have damage.
Repair method:
Replace the blisk.
* * * END SB   72-0013
Subtask 72-31-41-220-068
* * * PRE SB   72-0013( Old Design for the Stage 1 Blisk )
(2)Tip corners that are missing on trailing edge:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
* * * END PRE SB   72-0013
Subtask 72-31-41-220-070
* * * SB   72-0013( New Design for the Stage 1 Blisk )
(2).A.Missing trailing edge tip corners:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blisk.
* * * END SB   72-0013
Subtask 72-31-41-220-069
(3)All other damage:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount to a maximum of 0.040 inch (1.01 mm) in depth.
Repair method:
Blend the damage. Refer to TASK 72-31-41-300-801 (72-31-41, REPAIR 001).
Subtask 72-31-41-220-025
I.Do an inspection of the flange for:
(1)Fretting or galling on bolt pads:
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 72-31-41-220-026
(2)Nicks, dents, pits, and scratches on bolt pads:
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:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-027
(3)Fretting, galling, and wear on diameter AY:
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:
Repair. Refer to TASK 72-31-41-300-803 (72-31-41, REPAIR 002).
Subtask 72-31-41-220-028
(4)Nicks, dents, pits, and scratches on diameter AY:
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:
Repair. Refer to TASK 72-31-41-300-803 (72-31-41, REPAIR 002).
Subtask 72-31-41-220-052
(5)Nicks, dents, pits, and scratches on surface AX:
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:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-083
(6)Fretting, galling, and wear on surface AX:
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 72-31-41-220-029
J.Do an inspection of the boltholes for:
(1)Nicks, dents, pits, and scratches on the inner diameter:
Maximum serviceable limit:
Any amount 0.001 inch (0.03 mm) in depth after removal of high metal.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-030
(2)Nicks, dents, pits, and scratches on the chamfers:
Maximum serviceable limit:
Any amount 0.001 inch (0.03 mm) in depth after removal of high metal.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-031
(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 72-31-41-220-053
K.Do an inspection of the aft flange scallop (8 locations) for:
(1)Nicks, dents, pits, or scratches on the scallop surface:
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:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-054
(2)Nicks, dents, pits, or scratches on the scallop chamfers (forward and aft sides):
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:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-032
L.Do an inspection of the disk bore, hub faces, and web for:
(1)Nicks, dents, pits, or scratches on the disk bore:
Maximum serviceable limit:
Any amount 0.001 inch (0.03 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:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-076
(2)Nicks, dents, pits, or scratches on hub faces:
Maximum serviceable limit:
Any amount 0.003 inch (0.07 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:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-077
(3)Nicks, dents, pits, or scratches on webs and web transitions:
Maximum serviceable limit:
Any amount 0.001 inch (0.02 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:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-055
M.Do an inspection of the damper interface for:
(1)Nicks, dents, pits, or scratches:
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:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-056
(2)Fretting, galling, and 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 72-31-41-220-057
N. Do an inspection of the seal teeth for:
(1)Nicks, dents, pits, or scratches:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-058
(2)Seal teeth wear:
Maximum serviceable limit:
Any amount, if in the dimensional limits of the seal diameter. Refer to Subtask 72-31-41-220-039 (paragraph 5.A.(7)).
Repair method:
Replace the blisk.
Subtask 72-31-41-220-078
O.Do an inspection of the aft flange ID fillet for:
(1)Marks, nicks, dents, 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 72-31-41-300-802 (72-31-41, REPAIR 003).
Subtask 72-31-41-220-060
P.Do an inspection of all other areas on the disk portion of the part (does not include airfoils or flowpath) for:
(1)Nicks, dents, pits, or scratches:
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:
Repair. Refer to TASK 72-31-41-300-802 (72-31-41, REPAIR 003).
* * * FOR ALL
Figure 804   Definition of Root Fillet
* * * FOR ALL
Figure 805   Examples of Tip Contact Marks
6 . Special Dimensional Inspection.
Subtask 72-31-41-220-071
A.Deleted.
Subtask 72-31-41-220-072
B.Measure all dimensions with surface AX held flat within 0.001 inch (0.03 mm) and diameter AY restrained round within 0.001 inch (0.03 mm) unless specified differently.
Subtask 72-31-41-220-033
C.Measure the dimensions that follow:
(1)Dimension Y:
NOTE:
Do this special dimensional inspection only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 806.
Minimum serviceable limit:
4.22 inches (107.2 mm).
Repair method:
Replace the blisk.
* * * FOR ALL
Figure 806   Blisk Airfoil - Dimensional Inspection
Subtask 72-31-41-220-034
(2)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 806.
Minimum serviceable limit:
0.027 inch (0.69 mm).
Repair method:
Replace the blisk.
Subtask 72-31-41-220-035
(3)Dimension TE of the trailing 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 806.
Minimum serviceable limit:
0.021 inch (0.53 mm).
Repair method:
Replace the blisk.
Subtask 72-31-41-220-036
(4)Diameter AY:
Minimum serviceable limit:
15.4245 inches (391.782 mm).
Maximum serviceable limit:
15.4275 inches (391.859 mm).
Repair method:
Repair. Refer to TASK 72-31-41-300-803 (72-31-41, REPAIR 002).
Subtask 72-31-41-220-037
(5)Roundness of diameter AY:
Maximum serviceable limit:
0.0015 inch (0.038 mm).
Repair method:
Repair. Refer to TASK 72-31-41-300-803 (72-31-41, REPAIR 002).
Subtask 72-31-41-220-038
(6)Flatness of surface AX in free state:
Maximum serviceable limit:
0.006 inch (0.15 mm) in free state.
Repair method:
Replace the blisk.
Subtask 72-31-41-220-039
(7)Seal tooth diameter BD:
NOTE:
Measure each of the three seal teeth individually.
Minimum serviceable limit:
15.850 inches (402.59 mm).
Maximum serviceable limit:
15.870 inches (403.10 mm).
Repair method:
Replace the blisk.
Subtask 72-31-41-220-041
* * * PRE SB   72-0157( HPC Rotor Hardware Release for Non PIP 2 Engines )
D.Do an inspection of the height of the blade for:
NOTE:
Do this special dimensional inspection (applies to TH1, TH2 and TH3) only if a visual inspection or other defect condition makes a dimensional inspection necessary. Refer to Figure 806.
(1)Radius TH1 in relation with surface AX and diameter AY:
Minimum serviceable limit:
14.873 inches (377.77 mm).
Repair method:
Replace the blisk.
* * * END PRE SB   72-0157
Subtask 72-31-41-220-084
* * * SB   72-0157
(1).A.Radius TH1 in relation with surface AX and diameter AY:
Minimum serviceable limit:
14.897 inches (378.39 mm).
Repair method:
Replace the blisk.
* * * END SB   72-0157
Subtask 72-31-41-220-042
* * * PRE SB   72-0157( HPC Rotor Hardware Release for Non PIP 2 Engines )
(2)Radius TH2 in relation with surface AX and diameter AY:
Minimum serviceable limit:
14.603 inches (370.92 mm).
Repair method:
Replace the blisk.
* * * END PRE SB   72-0157
Subtask 72-31-41-220-085
* * * SB   72-0157
(2).A.Radius TH2 in relation with surface AX and diameter AY:
Minimum serviceable limit:
14.649 inches (372.09 mm).
Repair method:
Replace the blisk.
* * * END SB   72-0157
Subtask 72-31-41-220-061
* * * PRE SB   72-0157( HPC Rotor Hardware Release for Non PIP 2 Engines )
(3)Radius TH3 in relation with surface AX and diameter AY:
Minimum serviceable limit:
14.728 inches (374.09 mm).
Repair method:
Replace the blisk.
* * * END PRE SB   72-0157
Subtask 72-31-41-220-086
* * * SB   72-0157
(3).A.Radius TH3 in relation with surface AX and diameter AY:
Minimum serviceable limit:
14.761 inches (374.93 mm).
Repair method:
Replace the blisk.
* * * END SB   72-0157