757 AMM 飞机维护手册 空调 AIR CONDITIONING 1(41)

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 (a) (b) (c)  Use the solvent and a wiping cloth to clean the damaged area.Sand the damaged area to remove any remaining adhesive and contamination.Use the solvent and a wiping cloth to clean the damaged area.
 (7)  S 342-239Prepare a piece of polyurethane foam duct that matches the damaged duct and is the correct length to replace the damaged section of the duct.
 NOTE:____ Cut the replacement section with clearance for the material that will be added by the duct end repair procedure.
 (8)  S 342-240Do the Duct End Repair - Polyurethane Foam Duct procedure above for each end of the replacement duct section and for each end of the damaged duct.

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757 MAINTENANCE MANUAL
 S 342-241
 (9)  
Cut two pieces of the fiberglass cloth 3 inches wide and long enough to wind around the duct a minimum of four times.

 S 342-242

 (10)
 Prepare the resin.

 E.
Repair the Taped Joint

 S 342-243
 (1)  
Apply resin to the duct ends. Let the resin partially dry until it is sticky. Press the duct ends together by aligning the installation checkmarks.

 S 342-244

 (2)  
Apply the applicable resin to the joint area a minimum of 2 inches on both sides of the joint.

 S 342-245

 (3)  
Apply the applicable resin to one side of the two pieces of the fiberglass cloth.

 S 342-246

 (4)  
Wind one piece of the fiberglass cloth around each duct joint a minimum of four times.

 NOTE: Make sure the resin on the fiberglass cloth is in contact
____
 with the duct.

 S 342-247
 (5)  Put a piece of plastic sheet on the joint and press it 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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 229 ú Sep 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 342-248
 (6)  Let the resin cure for 24 hours at room temperature.
 S 342-249
 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)  
Clean any unwanted resin from the joint areas with a wiping cloth and solvent.

 F.
Put the Airplane Back to Its Usual Condition

 S 412-250
 (1)  
If insulation was removed from the duct, install new insulation.

 S 412-251

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

 TASK 21-23-01-302-252
 11. Tape Replacement - Duct with Polyimide Foam Insulation (Fig. 203)
______________________________________________________
 A. General
 (1)  
This procedure gives instructions to replace adhesive tape on air conditioning ducts insulated with Polyimide foam insulation (BMS 8-300). The Polyimide foam insulation has a flame-retardant Hypalon covering that is bonded to its outer surface and is distinguished by its brown color. The Polyimide foam insulation is wrapped around the duct and held in place with adhesive tape.

 B.
Consumable Materials

 (1)  
Insulation - Polyimide Foam (BMS 8-300)

 (2) Tape - Pressure sensitive adhesive (BMS5-149, Type XI, Class 1, ú Grade C) (AMM 20-30-07/201) ú ú NOTE:____Do not use the BMS 5-149 tape made by the Orcon Corporation ú with the BMS 8-300 polyimide foam insulation material. Only ú the BMS 5-149 tape made by E&H Laminating & Slitting Company ú is compatible with the BMS 8-300 polyimide foam insulation ú material. ú
　
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