747-400 AMM 飞机维护手册 空调 AIR CONDITIONING 1(45)

 D. Tape Replacement (Repair Method 1)
 S 028-018
 (1)  
Remove the duct if needed for better access.

 S 028-019

 (2)  
Remove all loose or old tape from the insulation.

 S 168-020
 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.
 (3)  Use the solvent and a wiping cloth to clean the surface of the insulation where new adhesive tape will be installed.
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 S 428-021
 (4)  Install new adhesive tape (BMS 5-149) to the insulation as shown in Figure 803.
 (a)  Make sure the adhesive tape overlaps all the edges and seams of the insulation by a minimum of 1-inch.
 S 428-022
 (5)  Re-install the duct (if removed).
 E. Cuts or Tears in Insulation (Repair Method 2)
 S 028-023
 (1)  Remove the duct if needed for better access.
 S 168-024
 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.
 (2)  
Use the solvent and a wiping cloth to clean the surface of the insulation around the damaged area.

 S 428-025

 (3)  
Apply a minimum 2-inch wide patch of adhesive tape (BMS 5-149) to completely cover the damaged area on the insulation.

 (a)  Make sure to apply a large enough patch to assure full coverage of the damaged area with a minimum 1/2-inch overlap.
 S 428-026
 (4)  Re-install the duct (if removed).
 F. Insulation Replacement (Repair Method 3)
 S 028-027
 (1)  
Remove the duct to permit removal of the insulation.

 (2)  
Remove all tape and existing insulation from the duct.

 S 428-029

 (3)  
Do these steps to install a new section of Polyimide foam
 insulation (BMS 8-300) around the duct:

 S 028-028
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 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.
 (a)  
Use the solvent and a wiping cloth to clean the outer surface of the insulation.

 (b)  
Wrap the insulation around the duct.

 (c)  
Install strips of 2-inch wide adhesive tape to the edges and seams of the insulation as shown in Figure 803 to hold it to the duct.

 (d)  
Make sure the adhesive tape overlaps all the edges and seams of the insulation by a minimum of 1-inch.

 S 428-030
 (4)  Re-install the duct.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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MAINTENANCE MANUAL

INSULATION