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TASK 72-24-40-300-801
1 . Repair for the Forward Fan Shaft.
A.This procedure gives instructions to repair the forward fan shaft (shaft) by removing and replacing the dry film lubricant. 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.
(4)Visual Inspection.
(m)Do an inspection of the dry film lubricant for:
1Missing dry film lubricant:
Maximum repairable limit:
Any amount.
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)
 
2117M43P01  
2321M44P01  
2321M44P02  
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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.
 
Description
Manufacturer
 
Atomizing-type Spray Gun
Local Purchase
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C02-004
Lubricant, Sprayable Air Drying (lubricant)
 
C02-088
Lubricant, Solid Dry Film (dry film lubricant)
 
C04-001
Solvent, General (methyl-ehtyl-ketone)
 
C04-003
Solvent, General (solvent)
 
C04-035
Solvent, General (isopropyl alcohol)
 
C04-113
Abrasive, Grit, Aluminum Oxide (220 mesh aluminum oxide)
 
C10-021
Tape, Plastic (masking tape)
 
C10-108
Brush, Disposable, Natural Bristle (brush)
 
C10-189
Tape, Paint Adhesion Testing (testing tape)
 
C10-251
Tape, Transparent Film (transparent film tape)
 
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Cheesecloth
 
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Cellophane Tape
C.Referenced Procedures.
 
ATA No.
Description
 
70-21-00
Chemical Cleaning
 
70-21-03
Cleaning Method No. 3 - Steam Cleaning
 
70-21-04
Cleaning Method No. 4 - Dry Abrasive Blast Cleaning
 
70-21-22
Cleaning Method No. 22 - Light Duty Aqueous Cleaning (Method 1)
 
Deleted

 
Deleted

 
70-32-00
Indirect Inspection Methods
 
70-32-03
Spot-Fluorescent-Penetrant Inspection
 
Deleted
 
70-43-29
Application of Air-Dried Molybdenum Disulfide Dry Film Lubricants
 
72-24-40
Inspection 001
D.Expendable Parts. None.
E.SPD Information. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-24-40-220-069
A.Refer to Figure 901 and Figure 902 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 72-24-40-350-002
A.Remove any dry film lubricant from the shaft. Refer to Figure 902, Figure 903 and as follows:
(1)If necessary, apply C10-021  masking tape to adjacent surfaces that do not have any dry film lubricant. Refer to Figure 903.
Subtask 72-24-40-100-001
(2)Clean the shaft to remove any dry film lubricant. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING), TASK 70-21-04-120-001 (CLEANING METHOD NO. 4 - DRY ABRASIVE BLAST CLEANING), and as follows:
(a)Use Method 4E.
(b)Use a pressure type blasting machine.
Subtask 72-24-40-220-070
(3)Do a visual inspection of the shaft for remaining dry film lubricant.
(a)If there is remaining dry film lubricant, do Subtask 72-24-40-100-001 (paragraph 5.A.(2)) again.
Subtask 72-24-40-110-005
B.Clean the shaft to remove remaining blast particles and unwanted materials. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING), TASK 70-21-22-110-042 (CLEANING METHOD NO. 22 - LIGHT DUTY AQUEOUS CLEANING (METHOD 1)) and as follows:
(1)Use Method 1.
Subtask 72-24-40-110-006
C.Deleted.
Subtask 72-24-40-200-001
D.Do an inspection of the shaft repair area V, area N, area R and area CM. Refer to TASK 70-32-00-200-002 (INDIRECT INSPECTION METHODS), TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION), Figure 902 and as follows:
(1)Use Class G penetrant.
(2)Indications 0.015 inch (0.38 mm) or less are permitted.
Subtask 72-24-40-100-002
E.Clean the shaft. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING) and TASK 70-21-03-160-001 (CLEANING METHOD NO. 3 - STEAM CLEANING).
Subtask 72-24-40-640-002
F.Lubricate the shaft area V, area N, area R, area CM, and the coupon with C02-088  dry film lubricant. Refer to TASK 70-43-29-380-001 (APPLICATION OF AIR-DRIED MOLYBDENUM DISULFIDE DRY FILM LUBRICANTS), Figure 902, Figure 903, and do as follows:
(1)Apply C10-021  masking tape to adjacent surfaces that do not need dry film lubrication.
(2)Make a flat coupon of the same material as the shaft approximately 1.0 inch (25 mm) x 1.0 inch (25 mm) and 0.062 inch (1.57 mm) in thickness.
Subtask 72-24-40-120-003
(3)Grit blast the shaft area V, area N, area R, and area CM. Refer to TASK 70-21-04-120-001 (CLEANING METHOD NO. 4 - DRY ABRASIVE BLAST CLEANING) and do as follows:
(a)Use method 4A as follows:
1Use C04-113  220 mesh aluminum oxide.
Subtask 72-24-40-110-007
WARNING:
ISOPROPYL ALCOHOL IS TOXIC AND FLAMMABLE. USE PERSONAL PROTECTION EQUIPMENT. USE IN A WELL-VENTILATED AREA.
CAUTION:
DO NOT TOUCH THE CLEANED AREA WITH BARE HANDS OR EXPOSE IT TO A SOURCE OF CONTAMINATION. IF THE C02-088 DRY FILM LUBRICANT IS NOT APPLIED IN 2 HOURS OF CLEANING PROCEDURE, YOU MUST CLEAN THE PART AGAIN.
(4)Clean the areas that you will lubricate with C04-035   isopropyl alcohol.
(a)The areas that you will lubricate must not have any unwanted material during application and curing of the dry film lubricant.
(b)Use a cheesecloth moist with C04-035  isopropyl alcohol.
(c)Replace the dirty cheesecloth with a new cleaning cheesecloth until the last moist cleaning cheesecloth stays clean.
(d)Let the cleaned surface air dry, or dry it with a clean, dry, cheesecloth.
Subtask 72-24-40-360-001
CAUTION:
IF YOU CANNOT FULLY MIX THE LUBRICANT COATING OR LET IT SETTLE, IT WILL RESULT IN AN UNACCEPTABLE LUBRICANT COATING. IT IS RECOMMENDED TO USE AN AGITATOR FOR PRESSURIZED FEED SYSTEMS.
(5)Mix the C02-088  dry film lubricant as it is specified in the manufacturer's instruction and as follows:
(a)Do not keep the C02-088  dry film lubricant in containers that do not properly seal.
(b)Deleted.
(c)Deleted.
Subtask 72-24-40-370-001
(6)Optional Procedure. Pre-heat the shaft to a maximum temperature of 200°F (93°C).
NOTE:
The rate of temperature increase is not important.
NOTE:
It is recommended that you pre-heat the shaft prior to spray the application of the C02-088  dry film lubricant to enhance the adhesion of the lubricant coating.
Subtask 72-24-40-640-003
(7)Apply the C02-088  dry film lubricant to area V, area N, area R and area CM on the shaft and the coupon at the same time and to the same thickness.
(a)Use a C10-108  brush or an external atomizing-type spray gun.
(b)Before the application of the next layer of C02-088   dry film lubricant, let it dry for a minimum of 15 minutes until you cannot see a wet look.
(c)Overspray permitted in area BR, area BN, area BP, and area BS.
(d)The dry film lubricant thickness must be 0.0007-0.0020 inch (0.018-0.050 mm) after the curing.
WARNING:
DELETED.
CAUTION:
DELETED.
(8)Allow the lubricant to air dry to a dull finish.
(9)Remove the masking before the curing process.
Subtask 72-24-40-360-002
WARNING:
USE THERMAL GLOVES WHEN YOU MOVE OR TOUCH HOT OR COLD PARTS. HOT OR COLD PARTS CAN CAUSE INJURY.
CAUTION:
DO NOT LET WATER, OIL, SOLVENT, OR ANY OTHER CONTAMINANTS COME IN CONTACT WITH THE COATED SURFACE BEFORE CURING. DAMAGE TO THE DRY FILM LUBRICANT CAN OCCUR.
(10)Cure the C02-088  dry film lubricant coating applied on the shaft areas and the coupon as follows:
Subtask 72-24-40-370-002
(a)Optional Procedure. Pre-heat the shaft and the coupon to a maximum temperature of 200°F (93°C).
NOTE:
The rate of temperature increase is not important.
Subtask 72-24-40-370-003
(b)Optional Procedure. Increase the temperature of the shaft and the coupon from 200 to 215°F (93 to 102°C) and hold at this temperature for a minimum of 15 minutes to decrease the risk of blistering and spalling of the C02-088  dry film lubricant.
(c)Increase the temperature of the part to 375 to 400°F (190 to 204°C). Keep the coated shaft and the coupon in the oven for 60 to 90 minutes.
(d)Remove the shaft and the coupon from the oven and let it air dry to room temperature.
Subtask 72-24-40-360-003
(11)Use the coupons to make sure the coating thickness is in limits.
(a)If the dry film lubricant coating thickness is less than the limits in Subtask 72-24-40-640-003 (paragraph 5.F.(7)(d), do Subtask 72-24-40-640-002 (paragraph 5.F.) again.
(b)If the dry film lubricant coating thickness is more than the limits in Subtask 72-24-40-640-003 (paragraph 5.F.(7)(d), do Subtask 72-24-40-350-002 (paragraph 5.A.) thru Subtask 72-24-40-640-002 (paragraph 5.F.) again.
Subtask 72-24-40-220-099
G.Do an inspection of the cured dry film lubricant coating. Refer to Figure 902 and as follows:
(1)Spalling/chipping and missing dry film lubricant are not permitted.
(2)The cured dry film lubricant must exhibit a complete coverage on the shaft repair area V, area N, area R, and area CM.
(3)The cured dry film lubricant must have a constant color, must be smooth, and adherent with no signs of cracks, scratches, pinholes, blisters, or other damage.
(4)Do a quality inspection of the shaft dry film lubricated areas as follows:
NOTE:
The bonding test can be done on the repaired shaft area V, area N, area R, and area CM or in a bonding sample.
(a)Apply cellophane tape, C10-189  testing tape, or C10-251  transparent film tape to do a quality test, and as follows:
1Push the tape down tightly, then suddenly pull it off.
2Use a 4X magnification glass to do a visual inspection.
3Make sure that the cured dry film lubricant does not peel or flake after tape removal and that there is no separation of the material.
4Light powdery particle on the tape is permitted.
WARNING:
REFER TO THE PRODUCT LABEL AND THE MANUFACTURER'S (MATERIAL) SAFETY DATA SHEET (SDS) FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING AND PROPER USE OF THIS PRODUCTS.
(b)Wipe the cured dry film lubricant with C04-001  methyl-ethyl-ketone or C04-003  solvent.
1Coating dissolution during wiping or removal that shows the underlying material is not permitted.
(c)Make sure that when you scratch the dry film lubricant with your fingernail, this does not remove the dry film lubricant from the shaft coated areas.
(d)The coating must be matte. Shiny or glossy coating is not permitted.
(5)Remove all masking from the shaft.
(6)If necessary, do Subtask 72-24-40-350-002 (paragraph 5.A.) thru Subtask 72-24-40-220-099 (paragraph 5.G.) again.
Subtask 72-24-40-380-001
H.If necessary, do a touch-up of the dry film lubricant areas. Refer to TASK 70-43-29-380-001 (APPLICATION OF AIR-DRIED MOLYBDENUM DISULFIDE DRY FILM LUBRICANTS), Figure 902, Figure 903 and as follows:
(1)Use C02-004  lubricant.
(2)If necessary, apply C10-021  masking tape to surfaces that you do not want to have the spray lubricant applied.
(3)Overlap with the adjacent painted areas is necessary to get full coating coverage of all bare metal.
(4)The lubricant thickness must be 0.0007-0.0020 inch (0.018-0.050 mm) after curing.
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Figure 901   Forward Fan Shaft
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Figure 902   (Sheet 1 ) Forward Fan Shaft Dimensions
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Figure 902   (Sheet 2 ) Forward Fan Shaft Dimensions
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Figure 902   (Sheet 3 ) Forward Fan Shaft Dimensions
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Figure 902   (Sheet 4 ) Forward Fan Shaft Dimensions
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Figure 903   (Sheet 1 ) Forward Fan Shaft Masking
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Figure 903   (Sheet 2 ) Forward Fan Shaft Masking
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Figure 903   (Sheet 3 ) Forward Fan Shaft Masking