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747-400 MAINTENANCE MANUAL
 E. Repair the Air Conditioning Duct
 S 348-076
 (1)  
Apply a thin, smooth layer of resin to the plastic sheet in the opening in the duct.

 S 348-077

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

 S 348-078

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

 S 348-079

 (4)  
Put a piece of plastic sheet on the cloth and press lightly with a squeegee or with your hand.

 NOTE: Make the cloth smooth from the center to the edges of the
____ cloth to remove bubbles or wrinkles and to remove unwanted resin.
 S 348-080
 (5)  
Remove the plastic sheet from the patch and remove unwanted resin with a wiping cloth.

 S 348-081

 (6)  
Put another piece of 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 348-082
 (7)  Put the last piece of cloth on top of the patch so it extends beyond the opening a minimum of 2 inches on all sides.
 NOTE: Smooth the cloth to remove bubbles or winkles.
____
 S 168-083
 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR IN 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 ENVIROMENT. 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.
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747-400 MAINTENANCE MANUAL
 S 348-084
 (9)  Let the resin cure for 24 hours at room temperature.
 F. Put the Airplane Back to Its Usual Condition
 S 428-085
 (1)  
If insulation was removed from the duct joint, install new insulation.

 S 418-086

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

 TASK 21-23-02-308-087
 5.  Rigid Foam Duct - Taped Joint Repair (Fig. 802)____________________________________
 A. General
 (1)  
This procedure gives instructions for the repair of the taped joint that connects sections of rigid foam air conditioning duct.

 (2)  
This procedure may also be used to make a temporary repair to a rigid 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) -commerically available

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

 (3)  
Resin - BMS 8-201 Type II (Epocast 50-A)

 (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)  
Squeegee - commercially available

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

 C. References
 (1)  AMM 36-00-00/201, Pneumatics - General
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747-400
　
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