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A 737-300/400/500MAINTENANCE MANUAL
 (4)  S 342-153Put 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.
 (5)  S 342-154Remove the plastic sheet from the fiberglass cloth and remove unwanted resin with a wiping cloth.
 (6)  S 342-155Follow the same procedure to apply the second piece of fiberglass cloth.
 (7)  S 342-156Let the resin cure for 24 hours at room temperature.
 S 342-157

 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)  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 412-158
 (1)  
Use the applicable procedure to return the duct to its usual condition.

 S 412-159

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

 TASK 21-23-25-302-160
 10. Duct Section Replacement - Polyurethane Foam Duct (Fig. 202)_________________________________________________
 A. General
 (1)  This procedure gives instructions to replace a section of polyurethane foam air conditioning duct.
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 B.
C.
D.
A 737-300/400/500MAINTENANCE MANUAL
 (2)  
If time or materials are not available to do this procedure, use the procedure to repair a taped duct joint to make a temporary repair. If a temporary repair is made, do this procedure as soon as possible to make a permanent repair.

Consumable Materials

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

 (2)  
Polyurethane foam duct (to match duct)

 (3)  
Plastic sheet - polyethylene or vinyl - commercially available

 (4)  
Resin for repair of fiberglass duct - R109A Hetron 92 Polyester

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

 (6)  
Solvent - B01011, Series 91 - commercially available (AMM 20-30-91/201)

 (7)  
Wiping cloth, lint-free - commercially available

 (8)
Squeegee - commercially availableReferences

 (1)
AMM 36-05-00/201, Pneumatic - GeneralPrepare for the Repair

 S 862-161

 (1)  
Release the pressure from the pneumatic system (AMM 36-05-00/201).

 NOTE: This will make sure that there is no airflow in the ducts
____
 when you do the repair.

 S 862-162
 (2)  
On the bleed air control module on the pilots' overhead panel, P5, put the pack control switches in the OFF position.

 S 012-163

 (3)  
Remove the applicable ceiling, sidewall, or floor panels to gain access to the damaged air conditioning duct.

 S 012-164

 (4)  
If insulation is installed on the duct joint, remove the insulation.

 S 342-165

 (5)  
Cut and remove the damaged section of polyurethane foam air conditioning duct. Cut the duct so the edges are straight and perpendicular to the circumference of the duct.

 (6)  
Do these steps to prepare the damaged area of the duct.

 S 342-166
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