S 342-043

 (10)
 Attach the cardboard or aluminum to the inside of the opening with adhesive tape so that it covers the opening and provides support for the plastic sheet.

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 21-23-25
 ALL  ú ú 01 Page 210 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 342-044
 (11) Prepare the applicable resin.
 E. Repair the Air Conditioning Duct
 S 342-045
 (1)  
Apply a thin, smooth layer of resin to the plastic sheet in the opening in the duct.

 S 342-046

 (2)  
Put a piece of fiberglass or Kevlar cloth in the opening over the plastic sheet so that it covers the opening completely.

 S 342-047

 (3)
Soak the fiberglass or Kevlar cloth with the applicable resin.

 S 342-048

 (4)  
Put a piece of plastic sheet on the fiberglass or Kevlar cloth and press lightly with a squeegee or with your hand. Make the fiberglass or Kevlar cloth smooth from the center to the edges of the cloth to remove any bubbles or any wrinkles and to remove unwanted resin.

 S 342-049

 (5)  
Remove the plastic sheet from the fiberglass or Kevlar cloth and remove unwanted resin with a wiping cloth.

 S 342-050

 (6)  
Put another piece of fiberglass or Kevlar cloth on the first piece so that it covers the opening, soak it with resin, and make it smooth.

 NOTE: Continue using the same procedure until the thickness of the
____
 patch equals the thickness of the duct.

 S 342-051
 (7)  Put the last piece of fiberglass or Kevlar cloth on top of the patch so it extends beyond the opening a minimum of 2 inches on all sides. Make the fiberglass or Kevlar cloth smooth from the center to the edges of the cloth to remove any bubbles or any wrinkles and to remove unwanted resin.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-23-25
 ALL  ú ú 01 Page 211 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 342-052
 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM THE SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (8)  
Wipe the duct around the patch with a wiping cloth and solvent to remove unwanted resin.

 S 342-053

 (9)  
Let the resin to cure for 24 hours at room temperature.

 F. Put the Airplane Back to Its Usual Condition
 S 412-054
 (1)  
If insulation was removed from the duct joint, install new insulation.

 S 412-055

 (2)  
Replace the panels or other airplane structure removed to gain access to the duct joint.

 TASK 21-23-25-302-056
 5.  Taped Joint Repair - Polyurethane Foam Duct (Fig. 202)___________________________________________
 A. General
 (1)  
This procedure gives instructions for the repair of the taped joint that connects sections of polyurethane foam air conditioning duct.

 (2)  
This procedure may also be used to make a temporary repair to a damaged polyurethane foam air conditioning duct when time is not available to make a permanent repair or if the materials are not available to make a permanent repair. If a temporary repair is made, make the permanent repair as soon as possible.

 B. Consumable Materials
 (1)  
Fiberglass cloth - minimum 0.007 inch thick (MIL-C-9084 Type VIII) -commercially available

 (2)  
Plastic sheet - polyethylene or vinyl - commercially available

 (3)  
Resin for repair of fiberglass duct - R109A Hetron 92 Polyester

 (4)  
Solvent - Butyl carbitol (alternative to B01011, Series 91) -commercially available (AMM 20-30-91/201)

 (5)  
Solvent - B01011, Series 91 - commercially available (AMM 20-30-91/201)
　
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