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TASK 72-22-40-300-802
1 . General Blend Repair.
A.This procedure gives instructions to repair the stage 1 fan disk (disk) by blending. Refer to Figure 901.
B.The following Maximum Repairable Limits apply to this repair:
NOTE:
The information below gives maximum repairable limits for the applicable Inspection sections. The paragraphs are numbered the same as the manual Inspection sections.
NOTE:
For 72-22-40, Inspection 001, refer to TASK 72-22-40-200-801 (72-22-40, INSPECTION 001) .
(4)Visual Inspection.
(a)Do an inspection of all areas of the fan disk for:
3Nicks, dents, and scratches (all areas unless identified in other paragraphs):
Maximum repairable limit:
Any amount that can be removed by blending to a maximum depth of 0.010 inch (0.25 mm), if:
•
The blends are more than 0.125 inch (3.18 mm) away from the boltholes.
•
There is more than 2.00 inches (50.8 mm) between blends.
•
The minimum blend radius is 0.130 inch (3.31 mm).
•
The blends are not more than 20 percent of the total area between boltholes.
4Nicks, dents, and scratches in the web areas:
Maximum repairable limit:
•
Any amount that can be removed by a blend to a maximum depth of 0.004 inch (0.10 mm), maximum width of 0.400 inch (10.16 mm), and a maximum length of 0.400 inch (10.16 mm).
•
The minimum blend radius is 1.00 inch (25.4 mm).
•
The minimum distance between damage areas on a web surface must not be less than 2.00 inches (50.8 mm).
7Nicks, dents, scratches, and fretting (on the seal aft face, surface D, and surface E only):
Maximum repairable limit:
A maximum of three locations to a maximum depth of 0.075 inch (1.90 mm) after blending, and a maximum width of 0.75 inch (19.0 mm) a minimum of 30 degrees apart. The minimum blend radius must be 1.00 inch (25.4 mm).
8Gouges on the seal aft face, surface D, and surface E:
Maximum repairable limit:
A maximum of three locations to a maximum depth of 0.075 inch (1.90 mm) after blending, and a maximum width of 0.75 inch (19.0 mm) a minimum of 30 degrees apart. The minimum blend radius must be 1.00 inch (25.4 mm).
10Nicks, dents, and scratches in area B (do not include web areas). Refer to Figure 801.
Maximum repairable limit:
Any amount that can be removed by blending to a maximum depth of 0.001 inch (0.02 mm). The minimum blend radius must be 0.013 inch (0.34 mm).
11Nicks, dents, and scratches in area B in bores. Refer to Figure 801.
Maximum repairable limit:
Any amount, that can be removed by blending to a maximum depth of 0.002 inch (0.05 mm). The minimum blend radius must be 0.600 inch (9.14 mm) or blend in depth to width ratio must be a minimum of 50:1. Keep a minimum distance of 1.00 inch (25.4 mm) between the blends.
(c)Do an inspection of the dovetail slots for:
4Wear/fretting on the bottom of the dovetail slots aft disk because of contact with the dovetail key (20-180 , 72-00-00) (SIN 8300B):
Maximum repairable limit:
Any amount in area BA, that can be removed by manually blending to a maximum circumferential length of 2.20 inches (55.8 mm), a maximum radial depth of 0.003 inch (0.07 mm), with a minimum blend radius of 0.600 inch (15.24 mm). Refer to Figure 901.
•
Blending into area DG is not permitted
•
Make sure that there is a smooth contour transition between blended and non-blended area without a step or cusps.
(d)Do an inspection of the forward and aft surfaces of the booster spool mounting flange, the flange of the forward fan shaft, and the spinner flange mating face for:
2Nicks, dents, and scratches in area V. Refer to Figure 801.
Maximum repairable limit:
•
One blend for each booster lug to a maximum of 0.006 inch (0.15 mm) in depth, after blending.
•
Blends must be 0.100 inch (2.54 mm) away from the bolthole chamfer.
•
The minimum blend width must be 0.140 inch (3.56 mm).
•
The minimum blend radius must be 0.080 inch (2.04 mm).
9Nicks, dents, scratches, and fretting on the forward and aft surfaces of the forward fan shaft mounting flange (but not in 0.210 inch (5.34 mm) of the boltholes and area G).
Maximum repairable limit:
Any amount, that can be removed by blending to a maximum depth of 0.010 inch (0.25 mm). The minimum blend radius must be 0.130 inch (3.31 mm).
C.The subsequent table gives a list of the part numbers that are applicable to this repair. All part numbers are applicable to all paragraphs unless specified differently.
 
Part Number(s)
 
2300M90G01  
2300M90G02  
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D.Proprietary/Complex Process Statement.
(1)None.
2 . Tools, Equipment, and Materials.
NOTE:
Repair sources can use equivalent alternatives for tools, equipment, and consumable materials, however, the repair source must demonstrate and document equivalency.
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
 
C04-271
Shot, Peening, Cast Steel (AMS 2431/2 ASH) Cast Steel Shot, High Hardness (55-62 HRc) (S110 cast steel shot)
 
C10-021
Tape, Plastic
 
C10-205
Almen Test Strips (Almen N test strips)
C.Referenced Procedures.
 
ATA No.
Description
 
70-21-00
Chemical Cleaning
 
70-21-03
Cleaning Method No. 3 - Steam Cleaning
 
70-24-00
Etching Procedures for Fluorescent-Penetrant Inspection
 
70-24-01
Swab Etching Procedure
 
70-32-00
Indirect Inspection Methods
 
70-32-03
Spot-Fluorescent-Penetrant Inspection
 
70-42-00
Blending and Removal of High Metal Procedures
 
70-47-01
Shotpeening
 
72-22-40
Cleaning 001
 
72-22-40
Inspection 001
D.Expendable Parts. None.
E.SPD Information.
(1)Locally Manufactured SPD. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-22-40-220-035
A.Refer to Figure 901 for specified dimensions and locations.
NOTE:
The dimensional data identified within this procedure was designed using inches as the base unit of measurement for dimensional values. The conversion to millimeters is rounded to one less decimal digit than inches. For minimum dimensions, converted values are rounded up. For maximum dimensions, converted values are rounded down. To avoid conversion errors, do not reconvert from millimeters to inches.
NOTE:
Reference dimensions do not require inspection.
4 . Setup Information. None.
5 . Procedure.
Subtask 72-22-40-160-008
A.Clean the disk. Refer to TASK 72-22-40-100-801 (72-22-40, CLEANING 001).
Subtask 72-22-40-350-005
CAUTION:
REMOVE ONLY THE MINIMUM QUANTITY OF PARENT MATERIAL NECESSARY OR DAMAGE TO THE DISK CAN OCCUR.
B.Blend the disk to remove damages. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES), Figure 901, and as follows:
(1)If necessary, apply C10-021  plastic tape to the surfaces adjacent to the damages where blending is not necessary.
(2)Remove minimum quantity of parent material to make the blends agree with the repairable limits.
(3)Break all sharp edges to a minimum of 0.030 inch (0.77 mm).
Subtask 72-22-40-110-008
C.Etch the disk blended areas. 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:
(1)Use Class B etchant.
Subtask 72-22-40-230-002
D.Do an inspection of the disk blended areas. Refer to TASK 70-32-00-200-002 (INDIRECT INSPECTION METHODS), TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION), and as follows:
(1)Use Class G penetrant.
(2)Refer to TASK 72-22-40-200-801 (72-22-40, INSPECTION 001) for the fluorescent penetrant acceptability limits.
Subtask 72-22-40-160-009
E.If necessary, clean the disk. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING) and TASK 70-21-03-160-001 (CLEANING METHOD NO. 3 - STEAM CLEANING).
Subtask 72-22-40-380-002
F.Peen the disk repaired areas. Refer to TASK 70-47-01-380-016 (SHOTPEENING), Figure 901, and as follows:
(1)Apply C10-021  plastic tape to the surfaces adjacent to the repaired areas where peening is not necessary.
(2)Use C04-271  S110 cast steel shots.
(3)Peen the repaired areas to an intensity of 0.006-0.012N. A minimum coverage of 100 percent is necessary.
(4)Overspray is not permitted.
(5)Use C10-205  Almen N test strips to do a check of the intensity at the disk repaired areas.
Subtask 72-22-40-160-010
CAUTION:
IF YOU WILL NOT INSTALL THE DISK IMMEDIATELY INTO THE ENGINE ASSEMBLY, PROTECT THE DISK TO PREVENT CONTAMINATION.
G.Clean the disk. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING) and TASK 70-21-03-160-001 (CLEANING METHOD NO. 3 - STEAM CLEANING).
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Figure 901   (Sheet 1 ) Stage 1 Fan Disk
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Figure 901   (Sheet 2 ) Stage 1 Fan Disk
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Figure 901   (Sheet 3 ) Stage 1 Fan Disk
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Figure 901   (Sheet 4 ) Stage 1 Fan Disk