(b)  
Round the corners of the fiberglass cloth pieces.

 S 342-124
 (11) Prepare the potting compound.
 E. Repair the Duct
 S 342-125
 (1)  
Apply the potting compound to the area where the polyurethane foam was removed.

 S 342-126

 (2)  
Put the piece of polyurethane foam in the area where the damaged foam was removed.

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 S 342-127
 (3)  Put a piece of plastic sheet on the piece of polyurethane foam and press on it to align the surface of the piece with the surface of the duct.
 S 342-128
 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.
 (4)  
Remove any unwanted resin from the edges of the piece of polyurethane foam with a wiping cloth soaked with solvent.

 S 342-129

 (5)  
Leave the plastic sheet on the repair area and let the potting compound cure for 5 hours at 125°F. Apply heat with a heat gun, heat lamp or heating blanket.

 S 342-130

 (6)  
Remove the plastic sheet and smooth the surface of the foam with sandpaper.

 S 342-131
 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.
 (7)  
Use the solvent and a wiping cloth to remove any dust from the duct.

 (8)  
Prepare the applicable resin.

 S 342-133

 (9)  
Put a piece of the fiberglass cloth on the resin so that it extends beyond the damaged area a minimum of 2 inches on all sides.

 S 342-132
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737-300/400/500MAINTENANCE MANUAL
 S 342-134
 (10)
 Soak the fiberglass cloth with the applicable resin.

 S 342-135

 (11)
 Put a piece of plastic sheet on the fiberglass cloth and press lightly with a squeegee or with your hand. Make the fiberglass cloth smooth from the center to the edges of the cloth to remove any bubbles or any wrinkles and to remove unwanted resin.

 S 342-136

 (12)
 Remove the plastic sheet from the fiberglass cloth and remove unwanted resin with a wiping cloth.

 S 342-137

 (13)
 Follow the same procedure to apply the second piece of the
 fiberglass cloth.

 S 342-138

 (14)
 Let the resin cure for 24 hours at room temperature.

 S 342-139
 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.
 (15) Remove unwanted resin from the edges of the repaired area with a wiping cloth soaked with solvent.
 F. Put the Airplane Back to Its Usual Condition
 S 412-140
 (1)  
If insulation was removed from the duct joint, install new
 insulation.

 S 412-141

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

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