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 21-23-25
 ALL  ú ú 01 Page 206 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 012-020
 (4)
If insulation is installed on the duct, remove the insulation.

 S 342-021

 (5)  
Do these steps to prepare the damaged area of the duct.

 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.
 (a)  
Use the solvent and a wiping cloth to clean the damaged area.

 (b)  
Drill a hole at each end of the cut or crack to prevent the cut or crack from getting larger. The holes should be a maximum of 1/16 inch diameter.

 (c)  
Sand the damaged area to remove any remaining adhesive and contamination.

 (d)  
Use the solvent and a wiping cloth to clean the damaged area.

 S 342-022
 (6)  Prepare the Fiberglass or Kevlar cloth.
 (a)  
Cut sufficient pieces of fiberglass or Kevlar cloth to equal the thickness of the duct.

 (b)  
Cut the fiberglass or Kevlar cloth pieces 1/2 inch larger on all sides than the damage.

 (c)  
Round the corners of the pieces of fiberglass or Kevlar cloth.

 S 342-023
 (7)  Prepare the applicable resin.
 E. Repair the Air Conditioning Duct
 S 342-024
 (1)  Apply a thin, smooth layer of resin to the duct where the fiberglass or Kevlar cloth will be applied.
 NOTE: Make sure the area of the resin is larger than the size and
____ shape of the fiberglass or Kevlar cloth pieces.
 S 342-025
 (2)  Put a piece of fiberglass or Kevlar cloth on the resin so that it extends beyond the cut or crack a minimum of 1/2 inch on all sides.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-23-25
 ALL  ú ú 01 Page 207 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 342-026
 (3)
Soak the fiberglass or Kevlar cloth with the applicable resin.

 S 342-027

 (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 342-028

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

 S 342-029

 (6)  
Put another piece of the fiberglass or Kevlar cloth on the first piece, 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 342-030
 (7)  Let the resin cure for 24 hours at room temperature.
 F. Put the Airplane Back to Its Usual Condition
 S 412-031
 (1)  
If insulation was removed from the duct joint, install new insulation.

 S 412-032

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

 TASK 21-23-25-302-033
 4. Structural Repair - Fiberglass or Kevlar Duct (Fig. 201)
_____________________________________________
 A. General
 (1)  
This procedure gives instructions for making a structural repair to a fiberglass or Kevlar air conditioning duct.

 (2)  
A structural repair is applicable when the damage to the air conditioning duct is a cut or a hole that is more than 1/4 inch wide and more than 3 inches long but less than 5 percent of the total surface area of the duct. If the damage is more than 5 percent of the total surface area of the duct, replace the duct section.
　
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