757 AMM 飞机维护手册 燃油 CHAPTER 28 - FUEL 1(7)

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 B.  Fuel Tanks
 (1)  
Two main fuel tanks and one center fuel tank keep fuel for the engines and APU (AMM 28-11-00/001). A surge tank near each wing tip supplies main tank overflow containment and venting. A drain check valve installed inboard of each surge tank lets fuel collected in the surge tanks return to the main fuel tanks but prevents fuel from the main fuel tank from going into the surge tanks. Overwing fill ports for each main fuel tank permit manual overwing fueling (AMM 28-11-00/001). Access doors on the wing lower surface permit access into the fuel tanks for inspection or component repair. Sump drain valves at the low point of each fuel tank permit the drainage of fuel tank contaminants, condensation, and fuel.

 C.  
Venting

 (1)  
The fuel vent system (AMM 28-13-00/001) supplies venting from each fuel tank to the surge tanks to prevent pressure/vacuum build-up. The surge tanks vent out of the fuel tanks through a vent scoop. A pressure relief valve in each surge tank supplies backup venting if flame arrester blockage occurs. Float valves prevent fuel from going into the vent channels. A flame arrestor also prevents external flame from going into the surge tank through the vent scoop.

 D.  
Fueling

 (1)  
The fueling system (AMM 28-21-00/001) supplies automatic and manual fueling capability. The fueling control panel, P28, on the right wing leading edge supplies control for the fueling process. Four fueling shutoff valves, one for each main and two for the center fuel tank, control the supply of fuel from the fueling adapters to the three fuel tanks. A load select control, controlled by the Fuel Quantity Indication System (FQIS) processor (AMM 28-41-00/001), supplies automatic control of fueling. The load select control automatically closes the applicable fueling shutoff valves when the selected fuel load is reached.

 (2)  
The volumetric top-off function and the overfill control function supply backup for the load select system. The volumetric top-off, controlled by the FQIS processor, closes the fueling shutoff valves when the fuel tanks are full. The overfill control has an fuel level sensor in each surge tank and a control card for the fuel level sensor. The overfill system closes the fueling shutoff valves when the fuel level sensor detects fuel entering the surge tanks.

 (3)  
Overwing fill ports supply access for manual fueling of each main fuel tank (AMM 28-11-00/001).

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757
MAINTENANCE MANUAL

FUELING CONTROL PANEL, P28CENTER FUEL TANK(AMM 28-41-00/001)(AMM 28-11-00/001)
　
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