757 AMM 飞机维护手册 燃油 CHAPTER 28 - FUEL 2(43)

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____ fuel quantity shows in the lower LCD display.
 (3)  
With electrical power, the automatic mode supplies automatic shutdown when the fuel tank is full and automatic shutdown at the preselected value. Automatic shutdown when the fuel tank is full is supplied in the manual mode when electrical power is available. An overfill protection system is supplied in the automatic mode and, when electrical power is available, in the manual mode. Without electrical power, no automatic shutdown or overfill protection is supplied and the fueling shutoff valves must be accessed and opened manually.

 (4)  
Fueling Modes

 (a)  
Automatic Mode With Electrical Power

 1)  During automatic mode of pressure fueling, the FQIS processor controls the fueling process. The FQIS processor monitors the quantity of fuel in each fuel tank constantly. The FQIS processor stops the fueling operation when the fuel tanks are full, have reached the selected fuel quantity, or if an unknown accuracy condition is detected by the FQIS processor.
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MAINTENANCE MANUAL

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Pressure Fueling Schematic (Example)Figure 6 (Sheet 1)

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Pressure Fueling Schematic (Example)Figure 6 (Sheet 2)
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MAINTENANCE MANUAL

 2)  Whenever an unknown accuracy condition occurs, the FQIS processor will close the fueling shutoff valve(s) for the applicable fuel tank. In addition, the failure of a single FQIS processor channel causes one of the two fueling shutoff valves in the center fuel tank to close.
 3)  Selecting the desired fuel quantity on the LOAD SELECT control thumbwheels and pressing the SET switches for the tanks to be fueled places the system in the automatic mode. The quantity selected is shown in the load select display (lower LCD). With the fuel truck nozzles attached to the fueling adapters (set in the fuel mode) and the fueling valve switches selected to FUEL, fuel enters the fueling manifold and into the selected tank through the corresponding fueling shutoff valve. The FQIS processor closes the fueling shutoff valves when the selected quantity is reached or the fuel tanks are full.
　
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