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TASK 72-00-01-300-818
1 . Fire Shields And Insulation Blanket Replacement On Firewalls.
A.This procedure gives instructions to repair the fan stator module assembly (fan stator module) by replacing damaged or missing fire shield(s)/insulation blanket on firewall(s). 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.
(aa)Do an inspection of each fire shield (01-680 , 72-21-00) (SIN 844A1), (01-690 , 72-21-00) (SIN 844A2), (01-700 , 72-21-00) (SIN 844A3), (01-710 , 72-21-00) (SIN 844A4) on the upper firewall (01-150 , 72-21-00) (SIN 84401), (01-151 , 72-21-00) (SIN 84401), (01-152 , 72-21-00) (SIN 84401) and the insulation blanket (01-720 , 72-21-00) (SIN 844A5) on the lower firewall (01-370 , 72-21-00) (SIN 84501), (01-371 , 72-21-00) (SIN 84501), (01-372 , 72-21-00) (SIN 84501) for:
1Loose, missing, or torn fire shield and/or insulation blanket aluminum foil:
Maximum repairable limit:
Any amount.
2Gouges in fire shield and/or insulation blanket with the same depth as the outer glass fiber layer or red RTV:
Maximum repairable limit:
Any amount.
3Gouges in fire shield and/or insulation blanket with the same depth as the inner glass fiber layer or white insulation material:
Maximum repairable limit:
Any amount.
4Missing or non-repairable fire shield(s) and/or insulation blanket:
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)
 
2437M01P01  
2446M37P01  
2447M00P01  
2447M01P01  
 
2475M25P01  
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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
 
Sand Bags
Local Purchase
(3)Locally Manufactured Tools. None.
WARNING:
REFER TO THE PRODUCT LABEL AND MANUFACTURER’S (MATERIAL) SAFETY DATA SHEET (SDS) FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING AND PROPER USE OF CONSUMABLE PRODUCTS.
B.Consumable Materials.
 
Code No.
Description
 
C01-007
RTV, Silicone Elastomer (RTV 106)
 
C01-159
Primer, RTV (primer)
 
C04-113
Abrasive, Grit, Aluminum Oxide (Abrasive grit)
 
C10-012
Tape, Masking, High Temperature (tape)
 
C10-040
Tape, Teflon
 
C10-062
Abrasive Cloth
C.Referenced Procedures.
 
ATA No.
Description
 
70-21-00
Chemical Cleaning
 
70-21-01
Cleaning Method No. 1 - Solvent Degreasing
 
70-21-03
Cleaning Method No. 3 - Steam Cleaning
 
70-21-04
Cleaning Method No. 4 - Dry Abrasive Blast Cleaning
 
70-21-23
Cleaning Method No. 23 - Hand-Wipe Degreasing
 
70-46-01
Masking and Cleaning of Epoxy and Polyester Matrix Thermosetting Composite Materials
D.Expendable Parts. None.
E.SPD Information.
 
CSN
Description
 
(01-680 , 72-21-00)
Shield, Fire
 
(01-690 , 72-21-00)
Shield, Fire
 
(01-700 , 72-21-00)
Shield, Fire
 
(01-710 , 72-21-00)
Shield, Fire
 
(01-720 , 72-21-00)
Insulation Blanket
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
Subtask 72-00-01-220-338
A.Refer to Figure 901, Figure 902, and Figure 903 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 re-convert from millimeters to inches.
NOTE:
Reference dimensions do not require inspection.
4 . Setup Information.
None.
5 . Procedure.
Subtask 72-00-01-110-060
A.Alternative Procedure Available. Clean the fan stator module. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING), TASK 70-21-03-160-001 (CLEANING METHOD NO. 3 - STEAM CLEANING), and as follows:
(1)Make sure to remove all the oil, grease, and dirt from the fan stator module.
Subtask 72-00-01-110-061
A.A.Alternative Procedure. Clean the fan stator module. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING), TASK 70-21-01-110-001 (CLEANING METHOD NO. 1 - SOLVENT DEGREASING), and as follows:
(1)Make sure to remove all the oil, grease, and dirt from the fan stator module.
Subtask 72-00-01-350-300
WARNING:
BE CAREFUL WHEN YOU USE SHARP OR POINTED TOOLS. THESE TOOLS CAN CAUSE AN INJURY TO YOU.
B.Remove all damaged fire shields/insulation blanket from the firewall(s) with a razor knife or plastic scraper as follows:
(1)Be careful not to cut into or make gouges in the parent material of the firewall(s) or other serviceable fire shields.
(2)Discard the fire shields that you removed from the firewall(s).
Subtask 72-00-01-110-062
C.Clean all firewall repair areas. Refer to TASK 70-21-00-110-051 (CHEMICAL CLEANING), and TASK 70-21-23-110-053 (CLEANING METHOD NO. 23 - HAND-WIPE DEGREASING).
NOTE:
Repair areas are specified as those areas on the firewall(s) where fire shield(s)/insulation blanket were removed.
Subtask 72-00-01-350-312
D.Remove all remaining adhesive from the firewall repair areas with C10-062  abrasive cloth.
Subtask 72-00-01-350-302
E.Apply masking to all fire shields adjacent to the firewall repair areas. Refer to TASK 70-46-01-350-030 (MASKING AND CLEANING OF EPOXY AND POLYESTER MATRIX THERMOSETTING COMPOSITE MATERIALS), and as follows:
(1)Use Composite Masking Method No. 4.
(2)Use C10-012  tape.
Subtask 72-00-01-120-013
F.Clean the repair areas on the firewall(s). Refer to TASK 70-21-04-120-001 (CLEANING METHOD NO. 4 - DRY ABRASIVE BLAST CLEANING), and as follows:
(1)Use Method No. 4A.
(2)Use C04-113  abrasive grit at a maximum pressure of 45 psi (310 kPa).
Subtask 72-00-01-160-044
WARNING:
USE EYE PROTECTION WHEN YOU USE COMPRESSED AIR TO CLEAN, COOL, OR DRY PARTS OR TOOLS. PARTICLES CAN CAUSE AN INJURY TO YOUR EYES. ENSURE COMPRESSED AIR PRESSURE IS LESS THAN 30 PSIG (207 KPA). DO NOT POINT COMPRESSED AIR AT YOURSELF OR OTHER PERSONS.
G.Blow the dust from the repair areas of the firewall(s) with clean, dry, compressed air that contains no oil.
Subtask 72-00-01-350-304
H.Clean the bonding surfaces of the firewall(s) and the SPD fire shield(s)/insulation blanket. Refer to TASK 70-46-01-350-030 (MASKING AND CLEANING OF EPOXY AND POLYESTER MATRIX THERMOSETTING COMPOSITE MATERIALS), paragraph 2.E., SPD Information, Figure 901, Figure 902, Figure 903, and do as follows:
(1)Use Composite Cleaning Method No. 4 or Composite Cleaning Method No. 5.
Subtask 72-00-01-350-305
I.Apply C10-040  teflon tape to all the non-bonding surfaces of the SPD fire shield(s)/insulation blanket. Refer to paragraph 2.E., SPD Information, Figure 901, Figure 902, Figure 903, and do as follows:
(1)Make sure that you apply masking to the faces of the SPD fire shield(s)/insulation blanket along their edges.
Subtask 72-00-01-350-313
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 PRODUCT.
J.Apply C01-159  primer to the bonding surfaces of the firewall(s) and the SPD fire shield(s)/insulation blanket. Refer to paragraph 2.E., SPD Information, Figure 901, Figure 902, Figure 903, and do as follows:
(1)Apply C01-159  primer only to the bonding surfaces of one repair area (one 90- degree segment of the firewall and one SPD fire shield/insulation blanket) at a time.
(2)Let the C01-159  primer dry for 1 hour as follows:
(a)Make sure that the SPD fire shield(s)/insulation blanket is bonded to the firewall in 4 hours or less after the C01-159   primer is cured.
Subtask 72-00-01-350-306
K.After the C01-159  primer is cured, apply a thin coating of C01-007  RTV 106 to the bonding surfaces of the SPD fire shield/insulation blanket and the firewall(s). Refer to paragraph 2.E., SPD Information, Figure 901, Figure 902, Figure 903, and do as follows:
(1)Make sure that you assemble the SPD fire shield(s)/insulation blanket to the firewall(s) in 2 minutes or less after you apply the C01-007  RTV 106.
Subtask 72-00-01-360-070
L.Bond the SPD fire shield(s)/insulation blanket to the firewall(s) and find the specific SPD location. Refer to paragraph 2.E., SPD Information, Figure 901, Figure 902, Figure 903, and do as follows:
(1)Assemble the SPD fire shield(s)/insulation blanket to the firewall(s) in 2 minutes after you apply the C01-007  RTV 106.
(2)Visually align the holes in the SPD fire shield(s) with the holes that are in the upper firewall.
Subtask 72-00-01-350-308
M.Prepare the SPD fire shield(s)/insulation blanket for curing and do as follows:
(1)Align the firewall until the SPD fire shield(s)/insulation blanket is at the bottom vertical position.
(2)Remove all unwanted adhesive.
(3)Apply a constant pressure of 2-5 psi (13.8-34.4 kPa) to the SPD fire shield/insulation blanket with clean sand bags for a minimum of 12 hours to prevent movement during curing.
Subtask 72-00-01-360-071
N.Cure the C01-007  RTV 106 in accordance with manufacturer instructions and do as follows:
(1)Let the C01-007  RTV 106 cure for a minimum of 24 hours at a room temperature of 65 to 85°F (18 to 29°C).
(2)Continue the repair and ship the fan stator module assembly before a full curing.
Subtask 72-00-01-350-310
O.Remove the sand bags from the SPD fire shield(s)/insulation blanket.
Subtask 72-00-01-220-339
P.Do an inspection of the SPD fire shield(s)/insulation blanket that you installed and as follows:
NOTE:
If C01-007  RTV 106 is not used, it is not necessary to cure the assembly again.
(1)Do a check of the voids between the firewall edges and the edges of the SPD fire shields, and insulation blanket.
Subtask 72-00-01-350-314
WARNING:
BE CAREFUL WHEN YOU USE SHARP OR POINTED TOOLS. THESE TOOLS CAN CAUSE AN INJURY TO YOU.
(2)If necessary, cut the edges of the SPD fire shields flush to firewall and do as follows:
(a)Seal all the cut edges with C01-007  RTV 106 and cure in accordance with manufacturer instructions.
(3)Do a check of all internal and external edges of the SPD fire shields and insulation blanket for unbonds, and as follows:
(a)If necessary, add C01-007  RTV 106 to fill voids and unbonds, and do as follows:
1After you fill voids and unbonds, remove unwanted material.
2Cure in accordance with manufacturer instructions.
Subtask 72-00-01-350-311
Q.Do Subtask 72-00-01-350-313 (paragraph 5.J.) thru Subtask 72-00-01-220-339 (paragraph 5.P.) again for all remaining repair areas of the firewall(s).
Subtask 72-00-01-350-315
R.Remove all masking from the SPD fire shield(s)/insulation blanket that you installed.
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Figure 901   Fan Stator Module
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Figure 902   (Sheet 1 ) Fan Stator Module - Fire Shields
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Figure 902   (Sheet 2 ) Fan Stator Module - Fire Shields
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Figure 902   (Sheet 3 ) Fan Stator Module - Fire Shields
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Figure 903   Fan Stator Module - Insulation Blanket