Zitat:
Original geschrieben von MaikStar
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Fuel System Operation
Fuel system management cards (FSMCs) command fuel valves open or closed and
fuel pumps on or off according to fuel management logic.
Preflight
When fuel pump switches are off before engine start, low pressure lights are illuminated on the main pump switches and extinguished on the override, CWT, and stabilizer tank pump switches.
Operation With Fuel in Center Wing Tank
The FSMCs close crossfeed valves 2 and 3 when flaps extend to takeoff position on the ground. Override/jettison pumps 2 and 3 are inhibited from operating when pressure is detected from both CWT override/jettison pumps. The CWT override/jettison pumps provide fuel to engines 1 and 4 and main pumps 2 and 3 provide fuel to their related engine.
The FSMCs open crossfeed valves 2 and 3 when the flaps are retracted. The CWT override/jettison pumps provide fuel to all engines.
When CWT fuel quantity decreases to 36,470 kilograms, the FSMCs open the appropriate valves and activate the transfer/jettison pumps to transfer fuel from the stabilizer tank to the CWT.
The Stabilizer Tank Pump switches are pushed off when both FUEL PMP STAB messages are displayed and fuel quantity indications show the stabilizer tank empty.
The CWT pump switches are pushed off when either FUEL OVRD CTR message displays or CWT fuel quantity is less than 900 kilograms.
The FSMCs activate override/jettison pumps 2 and 3 when low pressure is detected from either CWT override/jettison pump. Override/jettison pumps 2 provide fuel to engines 1 and 2 and override/jettison pumps 3 provide fuel to engines 3 and 4.
The FSMCs open the reserve transfer valves when main tank 2 or 3 fuel quantity decreases to 18,140 kilograms. Fuel transfers from reserve tanks 2 and 3 to the related main tank.
The EICAS message FUEL TANK/ENG displays when main tank 2 quantity is equal to or less than main tank 1 quantity, or when main tank 3 quantity is equal or less than main tank 4 quantity. The override pump switches and crossfeed valve switches 1 and 4 are pushed off after confirming tank quantities. Main pumps provide fuel to their related engine until engine shutdown.
Operation With No Fuel in Center Wing Tank
With no fuel in center wing tank, the FSMCs activate override/jettison pumps 2 and 3. The FSMCs close crossfeed valves 2 and 3 when the flaps extend to takeoff position on the ground. Override/jettisons pumps 2 provide fuel to engine 1 and override/jettison pumps 3 provide fuel to engine 4. Main pumps 2 and 3 provide fuel to their related engine.
The FSMCs open crossfeed valves 2 and 3 when the flaps are retracted. Override/jettison pumps 2 provide fuel to engines 1 and 2 and override/jettison pumps 3 provide fuel to engines 3 and 4.
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