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757
MAINTENANCE MANUAL

 ú (d) If access is not necessary for subsequent tasks, install the ú access panels you removed (AMM 28-11-02/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 28-00-00
 ALL  ú ú 01.1 Page 208 ú Sep 28/02

A

757 MAINTENANCE MANUAL
 FUEL TANKS - DESCRIPTION/OPERATION
__________________________________
 1.  General (Fig. 1)_______
 A.  Three fuel tanks, left main, right main, and center, keep the fuel necessary to run the engines and auxiliary power unit (APU). A surge tank, outboard of each main fuel tank, collects fuel overflow from the fuel tanks and includes equipment for venting the fuel tanks overboard (Ref 28-13-00/001).
 B.  The fuel tanks hold the necessary equipment for fueling (AMM 28-21-00/001), defueling (AMM 28-26-00/001), and engine fuel-feed (AMM 28-22-00/001). Equipment necessary for APU fuel-feed (AMM 28-25-00/001) and fuel quantity indicating (AMM 28-41-00/001) is also contained in the fuel tank structure.
 C.  Fuel Tank Construction
 (1)  
The 757 uses primary wing structure for the airplane fuel tanks. The fuel tanks are installed between the front and rear wing spars and between the upper and lower wing skin. Solid "tank end" ribs close the ends of each fuel tank, while all other wing ribs act as fuel baffles to minimize fuel slosh.

 (2)  
The wing structure permits inboard fuel flow. Fuel sump areas are found at the lowest point of each fuel tank. Sump drain valves at these sump areas permit unwanted materials to be drained from the fuel tank. The sump drain valves also permit removal of all remaining fuel after a fuel tank is defueled.

 (3)  
All fuel tanks are fluid tight. Close metal to metal fit of all parts forms the basic seal. BMS 5-26 sealing compound and sealed fasteners are used on all joints to complete the fluid tight seal.

 (4)  
Forty-five oval shaped access doors on the wing lower surface supply access to the fuel tanks.

 D.  
Main Fuel Tanks

 (1)  
　
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本文鏈接地址：757 AMM 飛機維護手冊 燃油 CHAPTER 28 - FUEL 1(16)