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757 MAINTENANCE MANUAL
 APU FUEL LINE AND SHROUD - REMOVAL/INSTALLATION
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 1.  General
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 A.  The APU fuel line connects the APU fuel shutoff valve to the APU and supplies the APU with fuel (Fig. 401). A shroud is on all sides of the APU fuel line and extends from the dry side of the center fuel tank to the APU firewall to prevent all external leakage of fuel vapor.
 ú B. It is not necessary to replace the aluminum tubing for the fuel system ú (Types 2024, 5052, and 6061) if the damage is not more than these limits: ú (1) The wall thickness reduction due to chafing or after the removal of ú metal to correct imperfections, (scratches, pits and similar flaws) ú is not more than 10 percent of the original wall thickness. ú (2) The depth of the smooth dents which are free of cuts is not more ú than 10 percent of the tube outer diameter for tubes up to two ú inches in diameter. ú (3) The depth of the smooth dents which are free of cuts is not more ú than 5 percent of the tube outer diameter for tubes more than two ú inches in diameter.
 C.  For approved repair of fuel systems aluminum tubing, refer to the CMM 28-00-10, Repair of Aluminum Fuel Tubes.
 D.  This procedure contains nine tasks. The tasks are:
 (1)  
Remove the fittings on the fuel line

 (2)  
Install the fittings on the fuel line

 (3)  
Remove the APU fuel line in the fuel tanks

 (4)  
Install the APU fuel line in the fuel tanks

 (5)  
Remove the APU fuel line and shroud between the center fuel tank and the APU firewall

 (6)  
Install the APU fuel line and shroud between the center fuel tank and the APU firewall

 (7)  
Remove the APU fuel drain line

 (8)  
Install the APU fuel drain line.

 (9)  
Leakage test of the APU fuel line and shroud.

 TASK 28-25-05-004-087
 2.  Remove the Fittings on the Fuel Line
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 A.  General
 (1)  This procedure gives examples of the removal procedure for fittings on the fuel line.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-25-05
 ALL  ú ú 01.1 Page 401 ú Sep 28/02

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757
MAINTENANCE MANUAL

 B. Access
 (1)  
Location Zones 133 Wing Center Section (Left) 134 Wing Center Section (Right) 241 Passenger Cabin - Section 44 (Left) 242 Passenger Cabin - Section 44 (Right) 251 Passenger Cabin - Section 46 (Left) 252 Passenger Cabin - Section 46 (Right) 311 Area Aft of Pressure Bulkhead to BS 1787.45 (Left) 312 Area Aft of Pressure Bulkhead to BS 1787.45 (Right) 313 Stabilizer Center Section Compartment (Left) 314 Stabilizer Center Section Compartment (Right) 315 APU Compartment (Left) 316 APU Compartment (Right) 531 Center Wing Tank (Left) 541 Main Tank - Rib No. 5 to No. 17 (Left)
　
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本文鏈接地址：757 AMM 飛機維護手冊 燃油 CHAPTER 28 - FUEL 4(34)