* * * FOR ALL
TASK 72-24-40-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the forward fan shaft (shaft). Refer to Figure 801.
•
Shaft (01-170 , 72-24-00) (SIN 81002)
•
Shaft (01-171 , 72-24-00) (SIN 81002) (SB 72-0216 ).
B.There are two configurations for the shaft. The difference is in the shaft mounting flange. The configuration 1 shaft (01-170 , 72-24-00) (SIN 81002) contains a scalloped flange with a counterbore (spot face) on the aft side of the flange. The configuration 2 shaft (01-170A , 72-24-00) (SIN 81002) and (01-171 , 72-24-00) (SIN 81002) does not contain a spot face.
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.
 
Description
Manufacturer
 
Guide Fixture for Rohmann Standard Rotors (GE-FQAP-302)
GE Aviation Field Way Support Technology
 
1 Neumann Way M/D Q8
 
Cincinnati, OH 45215
 
USA
 
E-mail: ndttooling@ae.ge.com
 
Fax: (513) 552-1386
 
Guide Fixture for Staveley RA Scanners (GE-FQAP-302A)
 
Guide Fixture for Hocking Rotors and Nortec Spitfire 2000 Rotor (GE-FQAP-302B)
 
Guide Fixture for Forster Rotors (GE-FQAP-302C)
 
High Speed Eddy Current Inspection Kit (GE-FQAP-621)
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C02-088
Lubricant, Solid Dry Film (dry film lubricant)
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
 
70-33-03
Special Inspection for Surface Fretting or Galling
 
70-42-00
Blending and Removal of High Metal Procedures
 
72-24-40
Cleaning 001
 
72-24-40
Repair 001
D.Expendable Parts. None.
3 . Specific Inspection Procedure.
Subtask 72-24-40-230-001
A.Remove the dry film lubricant from the spline teeth and threads. Refer to TASK 72-24-40-300-801 (72-24-40, REPAIR 001).
B.Do a Class G fluorescent penetrant inspection of the shaft. Refer to TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION).
•
Indications more than 0.015 inch (0.38 mm) are not permitted.
Subtask 72-24-40-110-004
C.Do an eddy current inspection of the vent holes of the shaft as follows:
CAUTION:
DO NOT USE METAL BRUSHES TO CLEAN THE SHAFT VENT HOLES. METAL BRUSHES CAN CAUSE SCRATCHES. SCRATCHES CAN CAUSE THE SHAFT TO BE REJECTED DURING THE EDDY CURRENT INSPECTION.
(1)Clean the shaft. Refer to TASK 72-24-40-100-801 (72-24-40, Cleaning 001).
NOTE:
It is recommended that you use a stiff nylon bottle brush to remove surface oxide and/or smut form the vent hole surfaces.
(2)If necessary, mechanically clean the vent hole surfaces. Refer to TASK 70-22-06-110-043 (SPECIAL CLEANING PROCEDURE 6 - BOLTHOLE CLEANING FOR EDDY CURRENT INSPECTION).
Subtask 72-24-40-250-001
(3)Do an eddy current inspection of the vent holes. 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:
Only trained, identified, and approved persons can do these inspections and tests. The authority to accept or reject hardware will not be given to the inspectors until they are certified. They must show they can satisfactorily do the necessary calibration and inspection procedures and correctly read the inspection results.
NOTE:
Changes to the procedure or substitutions for the equipment can cause you to detect less cracks. When you want to do or use something different, the procedure and equipment must be evaluated by the General Electric Company.
(a)Do an eddy current inspection of the shaft vent holes as follows:
1Use the GE-FQAP-621 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 following filter settings for the equipment used to do the eddy current inspection:
 
Rohman B1
Filter Frequency
1000 Hz BP
 
Rohman B2
HP filter
33 Hz
 
Range
X10
 
BP
0
 
Rohman B1V3/V4
Filter Frequency
High Pass 500 Hz
 
Low Pass 1.25 KHz
 
Staveley NDT 19
Filter Frequency
High Pass 350 Hz
 
Low Pass 500 Hz
 
Nortec 24
Filter Frequency
High Pass 350 Hz
 
Low Pass 500 Hz
 
Nortec 2000
Filter Frequency
High Pass 350 Hz
 
Low Pass 500 Hz
 
Hocking Phasec 1.1
Filter Frequency
High Pass 250 Hz
 
Low Pass 1.5 KHz
 
Hocking 2200
Filter Frequency
High Pass 400 Hz
 
Low Pass 2 KHz
 
Forster AF 2.833
Filter Frequency
High Pass 300 Hz
 
Low Pass 1 KHz
(b)Eddy current inspection evaluation limits.
1For high speed eddy current inspection, the evaluation limit is four major divisions.
(c)Eddy current inspection reject limits.
1For high speed eddy current inspection, the rejection limit is four major divisions after the evaluation is complete.
(d)All shafts that are rejected by the limits in Subtask 72-24-40-250-001 (paragraph C.(3)(c)) are not serviceable. All shafts that are not rejected by the limits in Subtask 72-24-40-250-001 (paragraph C.(3)(c)) are serviceable.
(e)Make sure that all records that were made during the eddy current inspection are as complete as possible. Permanently keep these records for each shaft that was inspected.
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Figure 801   (Sheet 1 ) Shaft Inspection Areas
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Figure 801   (Sheet 2 ) Shaft Inspection Areas
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Figure 801   (Sheet 3 ) Shaft Inspection Areas
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Figure 801   (Sheet 4 ) Shaft Inspection Areas
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Figure 801   (Sheet 5 ) Shaft Inspection Areas
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Figure 801   (Sheet 6 ) Shaft Inspection Areas
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Figure 801   (Sheet 7 ) Shaft Inspection Areas
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Figure 801   (Sheet 8 ) Shaft Inspection Areas
4 . Visual Inspection.
Refer to Figure 801.
Subtask 72-24-40-220-002
A.Do an inspection of all surfaces of the shaft (all areas unless identified in other paragraphs) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-003
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth, 0.020 inch (0.50 mm) in width. Sharp grooves are not permitted.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-24-40-300-802 (72-24-40, REPAIR 002).
Subtask 72-24-40-220-068
B.Do an inspection of shaft surface Z (including chamfer) for:
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth. Sharp grooves are not permitted.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-24-40-300-802 (72-24-40, REPAIR 002).
Subtask 72-24-40-220-071
C.Do an inspection of area P (forward shoulder edge of sump cover seating surface) for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-072
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.008 inch (0.20 mm) in depth, 0.100 inch (2.54 mm) in width. Sharp grooves are not permitted.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-24-40-300-802 (72-24-40, REPAIR 002).
Subtask 72-24-40-220-004
D.Do an inspection of the No. 1 and No. 2 bearing journals for:
(1)Wear on diameter B or diameter H:
Maximum serviceable limit:
Any amount, if in the limits of Subtask 72-24-40-220-060 (paragraph 5.A.(2)), Subtask 72-24-40-220-061 (paragraph 5.A.(3)) , and if there is no damage into the parent metal.
Repair method:
Repair the shaft. Refer to TASK 72-24-40-300-803 (72-24-40, REPAIR 003) .
Subtask 72-24-40-220-005
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth after removal of high metal, with adjacent defects at a minimum distance of 0.250 inch (6.35 mm) apart, and if there is no damage into the parent metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Repair the shaft. Refer to TASK 72-24-40-300-803 (72-24-40, REPAIR 003) .
Subtask 72-24-40-220-006
(3)Fretting:
Maximum serviceable limit:
Any amount, if in the limits of Subtask 72-24-40-220-060 (paragraph 5.A.(2)), Subtask 72-24-40-220-061 (paragraph 5.A.(3)) , and if there is no damage into the parent metal.
Repair method:
Repair the shaft. Refer to TASK 72-24-40-300-803 (72-24-40, REPAIR 003) .
Subtask 72-24-40-220-007
E.Do an inspection of the spanner nut threads for:
(1)Damage:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
All high metal must be removed. Full removal of the entrance thread is permitted if the total (cumulative) amount of damage on all other threads is not more than 50 percent of one full thread.
Repair method:
Remove the damage. Use a fine file or honing stone. If the first thread is removed, the radii must have the same shape as the original. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-24-40-220-008
F.Do an inspection of the mounting flange for:
(1)Nicks, dents, scratches, and fretting in the area 0.250 inch (6.35 mm) from the boltholes on the forward and aft flange surfaces:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth, 0.020 inch (0.50 mm) in width. Sharp grooves are not permitted.
Maximum repairable limit:
Deleted.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-009
(2)Nicks, dents, scratches, and fretting on the inner diameter, scallop (configuration 1 flange only), and edge surfaces:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth, 0.020 inch (0.50 mm) in width. No sharp grooves are permitted.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-24-40-300-802 (72-24-40, REPAIR 002).
Subtask 72-24-40-220-010
(3)Deleted.
Subtask 72-24-40-220-011
(4)Fretting on the mating face:
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 shaft.
Subtask 72-24-40-220-012
(5)Fretting on the aft surface from bolthead contact:
Maximum serviceable limit:
Repair method:
Replace the shaft.
Subtask 72-24-40-220-074
(6)Nicks, dents, scratches, and fretting in area G:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth, 0.020 inch (0.50 mm) in width. Sharp grooves are not permitted.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-075
(7)Forward flange fillet for:
(a)Nicks and dents:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth, 0.020 inch (0.50 mm) in width. Sharp grooves are not permitted.
Repair method:
Repair. Refer to TASK 72-24-40-300-802 (72-24-40, REPAIR 002).
Subtask 72-24-40-220-076
(b)Scratches and fretting:
Maximum serviceable limit:
Any amount, 0.003 inch (0.07 mm) in depth, 0.020 inch (0.50 mm) in width. Sharp grooves are not permitted.
Repair method:
Repair. Refer to TASK 72-24-40-300-802 (72-24-40, REPAIR 002).
Subtask 72-24-40-220-077
(8)Nicks, dents, scratches, and fretting in other areas:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth, 0.020 inch (0.50 mm) in width. Sharp grooves are not permitted.
Maximum repairable limit:
Deleted.
Repair method:
Repair. Refer to TASK 72-24-40-300-802 (72-24-40, REPAIR 002).
Subtask 72-24-40-220-013
G.Do an inspection of the boltholes for:
(1)Galling or scratches:
Maximum serviceable limit:
Any amount, 0.002 inch (0.05 mm) in depth after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the shaft.
Subtask 72-24-40-220-014
H.Do an inspection of the splines as follows. Refer to Figure 802.
(1)Area A for:
(a)Nicks and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
* * * FOR ALL
Figure 802   Shaft Spline Inspection Areas
Subtask 72-24-40-220-015
(b)Fretting:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-016
(c)High metal:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, not more than 10 teeth.
Repair method:
Remove high metal with a honing stone. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-24-40-220-017
(2)Area B for:
(a)Nicks and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-018
(b)Fretting:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-019
(c)High metal:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, not more than 10 teeth.
Repair method:
Remove high metal with a honing stone.
Subtask 72-24-40-220-078
(3)Root fillet for:
(a)Nicks and dents:
Maximum serviceable limit:
Any amount, 0.003 inch (0.07 mm) in depth.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-079
(b)Scratches:
Maximum serviceable limit:
Any amount, 0.001 inch (0.02 mm) in depth.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-020
(4)All other spline areas for:
(a)Nicks and scratches:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-021
I.Do an inspection of the shaft coupling nut seating surface (surface AT) as follows. Refer to Figure 801.
(1)Nicks, dents, scratches, and fretting:
Maximum serviceable limit:
A maximum of four defects, with a maximum diameter of 0.030 inch (0.76 mm) and with a maximum depth no more than the coating thickness, after removal of high metal. The distance between adjacent defects must be a minimum of 0.05 inch (1.3 mm). Each defect must have a smooth and rounded bottom. No damage into parent metal is permitted. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Repair the shaft. Refer to TASK 72-24-40-300-803 (72-24-40, REPAIR 003) .
Subtask 72-24-40-220-022
J.Do an inspection of the fan mid shaft seating surface (surface AP) for:
(1)Fretting:
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 shaft.
Subtask 72-24-40-220-023
K.Do an inspection of the shaft aft pilot diameter (diameter FC) for:
(1)Wear, fretting, and galling on the fan mid shaft contact area of the pilot:
Maximum serviceable limit:
0.005 inch (0.13 mm) in depth on no more than 50 percent of the surface area if equally spaced circumferentially. The remaining surface area must be in the limits of Subtask 72-24-40-220-063 (paragraph 5.A.(5)) .
Repair method:
Repair. Refer to TASK 72-24-40-300-804 (72-24-40, REPAIR 004) .
Subtask 72-24-40-220-058
L.Do an inspection of the shaft forward pilot (diameter CF) for:
(1)Galling on pilot:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth.
Repair method:
Repair. Refer to TASK 72-24-40-300-804 (72-24-40, REPAIR 004) .
Subtask 72-24-40-220-066
M.Do an inspection of the dry film lubricant for:
(1)Missing dry film lubricant:
Maximum serviceable limit:
Ten percent of the thread or spline area can have missing dry film lubricant.
Repair method:
Replace the dry film lubricant. Refer to TASK 72-24-40-300-801 (72-24-40, REPAIR 001).
Subtask 72-24-40-220-080
N.Do an inspection of the airhole (chamfer included) as follows:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-081
(2)Nicks and dents:
Maximum serviceable limit:
Any amount, 0.003 inch (0.07 mm) in depth, 0.020 inch (0.50 mm) in width. Sharp grooves are not permitted.
Repair method:
Replace the shaft.
Subtask 72-24-40-220-082
(3)Scratches:
Maximum serviceable limit:
Any amount, 0.001 inch (0.02 mm) in depth. Sharp grooves are not permitted.
Repair method:
Replace the shaft.
5 . Dimensional Inspection.
Refer to Figure 801.
Subtask 72-24-40-220-059
A.Do an inspection of the shaft for:
(1)Mounting boltholes (diameter DH):
Minimum serviceable limit:
0.7545 inch (19.164 mm).
Maximum serviceable limit:
•15 holes - 0.7555 inch (19.190 mm)
•8 holes - 0.7559 inch (19.200 mm)
•3 holes - 0.7579 inch (19.251 mm)
•No more than three holes in a group of five consecutive holes can be larger than 0.7555 inch (19.190 mm).
Repair method:
Replace the shaft.
Subtask 72-24-40-220-060
(2)No. 1 bearing journal (diameter B measured only on area JB):
Minimum serviceable limit:
15.9248 inches (404.490 mm).
Maximum serviceable limit:
15.9256 inches (404.510 mm).
Repair method:
Repair the shaft. Refer to TASK 72-24-40-300-803 (72-24-40, REPAIR 003) .
Subtask 72-24-40-220-061
(3)No. 2 bearing journal (diameter H measured only on area JH):
Minimum serviceable limit:
8.2025 inches (208.344 mm).
Maximum serviceable limit:
8.2035 inches (208.369 mm).
Repair method:
Repair the shaft. Refer to TASK 72-24-40-300-803 (72-24-40, REPAIR 003) .
Subtask 72-24-40-220-062
(4)Shaft forward pilot diameter (diameter CF):
NOTE:
Measurement must be taken at the middle of the pilot length.
Minimum serviceable limit:
Deleted.
Maximum serviceable limit:
5.2776 inches (134.051 mm).
Repair method:
Repair. Refer to TASK 72-24-40-300-804 (72-24-40, REPAIR 004) .
Subtask 72-24-40-220-063
(5)Shaft aft pilot diameter (diameter FC):
NOTE:
Measurement must be taken at the middle of the pilot length.
Minimum serviceable limit:
Deleted.
Maximum serviceable limit:
5.6170 inches (142.672 mm).
Repair method:
Repair. Refer to TASK 72-24-40-300-804 (72-24-40, REPAIR 004) .
Subtask 72-24-40-220-064
(6)Surface A in relation to surface AP:
NOTE:
Deleted.
Minimum serviceable limit:
21.332 inches (541.83 mm).
Maximum serviceable limit:
21.340 inches (542.04 mm).
Repair method:
Replace the shaft.
Subtask 72-24-40-220-065
(7)Runout of diameter H in relation to diameter B:
Minimum serviceable limit:
None.
Maximum serviceable limit:
0.0005 inch (0.013 mm).
Repair method:
Replace the shaft.
6 . Apply Dry Film Lubricant to the Threads and Splines
Subtask 72-24-40-640-001
A.If necessary, apply C02-088  dry film lubricant to the threads and splines of the shaft. Refer to TASK 72-24-40-300-801 (72-24-40, REPAIR 001).