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TASK 72-53-40-800-802
1 . General.
A.This procedure gives instructions to do a focused inspection of the forward middle radial rabbet of the HPT rotor stage 1 disk (stage 1 disk) (01-280 , 72-53-00) (SIN 150A1) or (01-280A , 72-53-00) (SIN 150A1) or (02-280 , 72-53-00) (SIN 150A1) for dents. If dent(s) is observed then the adjacent axial face (surface FR) will receive a focused inspection.
B.Any reject indications observed during the accomplishment of the following inspection should be reported by e-mail to Fleet Support at Aviation.Fleet.Support1@ge.com. Please include the following details:
• Part number and serial number
• Customer/Operator
• Time since new
• Cycles since new
• Time since overhaul
• Cycles since overhaul
• Indication size(s)
• Photos of the indication(s).
Alternatively, this information can be submitted as a Service Request (SR) via myGEAviation.com.
2 . Tools, Equipment, and Materials.
NOTE:
You can use equivalent alternatives for tools, equipment, and consumable materials.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C10-010
Abrasive Cloth (scotch brite pad)
C.Referenced Procedures.
 
ATA No.
Description
 
70-24-00
Etching Procedures for Fluorescent-Penetrant Inspection
 
70-24-01
Swab Etching Procedure
 
70-32-00
Indirect Inspection Methods
 
70-32-02
Fluorescent Penetrant Inspection
 
70-32-03
Spot-Fluorescent-Penetrant Inspection
 
72-53-40
Cleaning 001
 
72-53-40
Inspection 001 - Configuration 01
 
72-53-40
Inspection 001 - Configuration 02
D.Expendable Parts. None.
3 . Specific Inspection Procedure.
Subtask 72-53-40-220-218
A.Do a focused inspection of the HPT rotor stage 1 disk forward middle radial rabbet as follows:
(1)Make sure that the disk is clean. Refer to TASK 72-53-40-100-801 (72-53-40, CLEANING 001).
(2)Do a 10X white light visual inspection of the forward middle radial rabbet for any dents.
NOTE:
For specific serviceability/repair criteria for dent(s) on the forward middle radial rabbet, refer to TASK 72-53-40-200-801 (72-53-40, INSPECTION 001 - CONFIG 01) or TASK 72-53-40-200-802 (72-53-40, INSPECTION 001 - CONFIG 02). If the dent(s) is more than the limits specified, the part is not serviceable.
(3)At each dent location found, do a 10X white light visual inspection of the adjacent face (surface FR) and adjacent chamfer for signs of bulging, refer to Figure 201, Figure 202, and do as follows:
(a)For bulging/plastic deformation less than or equal to 0.002 inch (0.05 mm) do as follows:
NOTE:
For specific serviceability/repair criteria for bulging or plastic deformation on the axial face adjacent to the forward middle radial rabbet (surface FR), refer to TASK 72-53-40-200-801 (72-53-40, INSPECTION 001 - CONFIG 01) or TASK 72-53-40-200-802 (72-53-40, INSPECTION 001 - CONFIG 02). If the bulging or plastic deformation is more than the limits specified, the part is not serviceable.
NOTE:
It is still necessary to perform the following inspection criteria even if there is no discernible/interpretable bulge/plastic deformation measurement.
1For every dent, locally polish the adjacent face (surface FR with the chamfer) with a C10-010  scotch brite pad (or equivalent) to get a better surface finish than the adjacent area.
Subtask 72-53-40-110-022
2Locally etch the polished area(s). Refer to TASK 70-24-00-110-033 (ETCHING PROCEDURES FOR FLUORESCENT-PENETRANT INSPECTION), TASK 70-24-01-110-034 (SWAB ETCHING PROCEDURE), and as follows:
aUse Class C etchant or Class G etchant.
Subtask 72-53-40-230-013
3Do a spot-fluorescent penetrant inspection with 10X under black light to the etched location(s). Refer to TASK 70-32-00-200-002 (INDIRECT INSPECTION METHODS), TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION), and as follows:
aUse Class G penetrant.
bUse non-aqueous wet developer (NAWD).
cMake sure that the penetrant application procedure has a minimum dwell time of 50 minutes.
dNo linear indications are permitted. Do as follows:
NOTE:
Linear indications are indications that are at least three times longer than they are wide.
(1)If you find linear indications, do a solvent wipe process to find if the indication is repeatable. Refer to TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION).
(2)If the indication does not re-appear after the solvent wipe process, apply NAWD again, wait 10 minutes and do the inspection again. If the original indication does not come into view again then the definition of the condition is non-repeatable, and is permitted.
(3)You must report back all linear indication(s) to Fleet Support. Refer to paragraph 1.B. for contact details and information needed. Include the additional details:
• Location of the indication relative to the blade slot location. Refer to Figure 203 to map location of the indication
• Dent dimensions (with photos)
• Photos and details of the indication(s).
Subtask 72-53-40-220-219
(b)If you find signs of bulging more than 0.002 inch (0.051 mm), the disk is not serviceable and do as follows:
1Report all findings, including linear indication(s) to Fleet Support. Refer to paragraph 1.B. for contact details and information needed. Include the additional details:
• Location of dent relative to the blade slot location. Refer to Figure 203 to map location of defect
• Dent dimensions (include photos, position of the dent relative to the forward edge, and include dimensions of the bulge-height of deformed material relative to the adjacent surface).
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Figure 201   (Sheet 1 ) HPT Rotor Stage 1 Disk - Focus Inspection of the Forward Middle Radial Rabbet - Configuration 1
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Figure 201   (Sheet 2 ) HPT Rotor Stage 1 Disk - Focus Inspection of the Forward Middle Radial Rabbet - Configuration 1
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Figure 202   (Sheet 1 ) HPT Rotor Stage 1 Disk - Focus Inspection of the Forward Middle Radial Rabbet - Configuration 2
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Figure 202   (Sheet 2 ) HPT Rotor Stage 1 Disk - Focus Inspection of the Forward Middle Radial Rabbet - Configuration 2
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Figure 203   HPT Rotor Stage 1 Disk - Forward Middle Radial Rabbet Data Collection Sheet