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TASK 72-00-01-300-817
1 . Repair Of Fire Shields On Firewall.
A.This procedure gives instructions to repair the fan stator module assembly (fan stator module) by filling in gouges and/or replacing loose, missing, or torn aluminum foil on the fire shield(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 aluminum foil:
Maximum repairable limit:
75 percent of the total foil surface area.
2Gouges in fire shield with the same depth as the outer glass fiber layer or red RTV:
Maximum repairable limit:
0.1 inch (2 mm) in width by 0.5 inch (12 mm) in length.
3Gouges in fire shield with the same depth as the inner glass fiber layer or white insulation material:
Maximum repairable limit:
0.1 inch (2 mm) in width by 0.5 inch (12 mm) in length.
4Missing or non-repairable fire shield(s)/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  
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.
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
 
C01-178
RTV, Silicone Elastomer (RTV 159)
 
C10-012
Tape, Masking, High Temperature (tape)
 
C10-040
Tape, Teflon
 
C10-216
Tape, Aluminum Foil/Glass Cloth (foil tape)
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
 
70-43-07
Chemical Touch-Up Surface Refinishing Process for Aluminum
 
70-46-01
Masking and Cleaning of Epoxy and Polyester Matrix Thermosetting Composite Materials
 
72-00-01
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 72-00-01-220-331
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 re-convert from millimeters to inches.
NOTE:
Reference dimensions do not require inspection.
4 . Setup Information.
None.
5 . Procedure.
Subtask 72-00-01-110-058
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 72-00-01-110-059
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 72-00-01-350-288
WARNING:
BE CAREFUL WHEN YOU USE SHARP OR POINTED TOOLS. THESE TOOLS CAN CAUSE AN INJURY TO YOU.
B.Remove the loose, missing, or torn aluminum foil from the fire shield(s) of the fan stator module. Refer to Figure 901 and do as follows:
(1)Remove the foil with your hands or carefully with a razor knife.
(2)Be careful not to cut into or make gouges in the material below the aluminum foil or other adjacent serviceable fire shields.
(3)Discard the removed aluminum foil.
Subtask 72-00-01-350-289
C.Clean the area of the fan stator module where you removed the aluminum foil. 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 Cleaning Method No. 4 or Composite Cleaning Method No. 5.
Subtask 72-00-01-350-290
D.If necessary, apply masking to the adjacent areas of the fan stator module that you will not repair. 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 72-00-01-350-291
E.If necessary, apply masking to the fire shields of the fan stator module that you will repair as follows:
(1)Use C10-040  teflon tape.
(2)Make sure that you apply masking to all the non-bonding faces and edges of the fire shield.
Subtask 72-00-01-350-292
F.Use C01-178  RTV 159 to fill in all areas of the fan stator module of missing or damaged fire shield(s) as follows:
(1)Apply C01-159  RTV primer to the bond surface.
(2)Make sure that the filler C01-178  RTV 159 is approximately flush with the adjacent surfaces.
Subtask 72-00-01-350-293
G.Wipe-off all unwanted C01-178  RTV 159 material from the repair areas of the fan stator module.
Subtask 72-00-01-360-066
H.Cure the repair areas of the fire shield(s) in accordance with the manufacturer’s instructions and as follows:
(1)Let the C01-178  RTV 159 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.
NOTE:
Forced cure temperature above 100°F (38°C) does not make the adhesive curing procedure faster and is not permitted.
Subtask 72-00-01-350-294
I.Do an inspection of the repair areas of the fire shield(s) in the fan stator module to make sure that you fully seal all the external perimeter surfaces as follows:
(1)Apply C01-159  RTV primer to bond surface.
(2)Add C01-007  RTV 106, as necessary, to fill voids.
Subtask 72-00-01-360-067
(3)If you used C01-007  RTV 106, cure the repaired areas of the fire shield for 24 hours at a room temperature of 65 to 85°F (18 to 29°C).
Subtask 72-00-01-350-295
J.Remove all masking from the fire shield(s) of the fan stator module.
Subtask 72-00-01-350-296
K.Cut the necessary piece(s) of C10-216  foil tape. Refer to Figure 901 and do as follows:
(1)Replacement foil must be a minimum of 0.50 inch (12.7 mm) larger than the areas of the fire shield(s) in the fan stator module repaired with RTV.
(2)If more than one piece of C10-216  foil tape is necessary, there must be a minimum overlap of 0.20 inch (5.1 mm) between pieces.
Subtask 72-00-01-350-297
L.Clean the aluminum foil surface of the fire shield(s) that you will repair in the fan stator module. 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 Cleaning Method No. 4 or Composite Cleaning Method No. 5.
(2)Make sure that you clean the foil surface a minimum of 1.0 inch (26 mm) around the area that you will repair.
Subtask 72-00-01-350-298
M.Apply the C10-216  foil tape to the repair areas of the fire shield(s) in the fan stator module. Refer to Figure 901 and do as follows:
(1)Visually align the C10-216  foil tape with the holes in the fire shield(s).
(2)Visually align the edges of the C10-216  foil tape with the edges of the fire shield.
(3)Rub the surface of the C10-216  foil tape tightly with your fingers or with a soft plastic spatula, and do as follows:
(a)Push all air bubbles to the edge of the C10-216   foil tape.
(b)Make sure that all the edges are tightly pushed down.
(4)If it is necessary to use more than one piece of the C10-216  foil tape, make an overlap in the pieces to a minimum of 0.20 inch (5.1 mm).
Subtask 72-00-01-350-299
N.Do Subtask 72-00-01-350-296 (paragraph 5.K.) thru Subtask 72-00-01-350-298 (paragraph 5.M.) again for all the remaining repair areas of the fire shield(s) in the fan stator module.
Subtask 72-00-01-380-017
O.If necessary, surface-treat all the bare aluminum areas of the fire shield(s) in the fan stator module. Refer to TASK 70-43-07-380-007 (CHEMICAL TOUCH-UP SURFACE REFINISHING PROCESS FOR ALUMINUM), and as follows:
(1)Do not apply the touch-up coat to the C10-216  foil tape.
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Figure 901   (Sheet 1 ) Fan Stator Module
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Figure 901   (Sheet 2 ) Fan Stator Module
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Figure 901   (Sheet 3 ) Fan Stator Module
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Figure 901   (Sheet 4 ) Fan Stator Module
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Figure 901   (Sheet 5 ) Fan Stator Module