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

 S 342-082
 (6)  Prepare the fiberglass cloth.
 (a)  
Cut a piece of fiberglass cloth the length of the outside circumference of the duct.

 (b)  
The fiberglass cloth should have the width needed to overlap the duct end and the inside and outside of the duct a minimum of 1/2 inch.

 S 342-083
 (7)  Prepare the resin.
 E. Repair the Duct End
 S 342-084
 (1)  Apply a thin, smooth layer of resin on the duct end and on the surface of the duct a minimum of 1/2 inch from the duct end.
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A 737-300/400/500MAINTENANCE MANUAL
 S 342-085
 (2)  
Wind the fiberglass cloth around the duct end so that is overlaps a minimum of 1/2 inch on both sides of the end.

 S 342-086

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

 S 342-087

 (4)  
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 342-088

 (5)  
Let the resin cure for 24 hours at room temperature.

 S 342-089
 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.
 (6)  Clean the area with a wiping cloth and solvent to remove unwanted resin.
 F. Put the Airplane Back to Its Usual Condition
 S 412-090
 (1)  
If insulation was removed from the duct joint, install new insulation.

 S 412-091

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

 TASK 21-23-25-302-092
 7.  External Patch Repair - Polyurethane Foam Duct (Fig. 202)______________________________________________
 A. General
 (1)  This procedure gives instructions for the repair of a polyurethane foam air conditioning duct if the damage is less than 1/4 inch deep less than 1 inch long and the inner lining is not damaged. If the damage is larger, do the Structural Repair - Polyurethane Foam Duct procedure below.
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 B.

C.
D.
A
737-300/400/500MAINTENANCE MANUAL
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)

 (6)  
Wiping cloth, lint-free - commercially available

 (7)
Squeegee - commercially availableReferences

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

 S 862-093

 (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 862-094
 (2)  
On the bleed air control module on the pilots' overhead panel, P5, put the pack control switches in the OFF position.
　
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