12 - 757 Fuel

Fuel Quantity When total usable fuel in either the left or right main tank drops below approximately _______________, the FUEL CONFIG light illuminates and the LOW FUEL caution message is displayed. 1000 kilograms. 1000 punds. 2200 kilograms.

Fuel Pumps Each fuel tank contains two AC–powered fuel pumps. A single pump can supply sufficient fuel to operate one engine under all conditions. The two pumps need to be operative to supply sufficient fuel to the engine under all conditions.

Fuel Pumps The two center tank fuel pumps have: greater output pressure than the left and right main tank fuel pumps. lower output pressure than the left and right main tank fuel pumps.

Fuel Pumps When the center pump switches are OFF, the low pressure lights and EICAS messages for the center pumps are: inhibited. not inhibited.

Fuel Pumps With either CENTER PUMPS LOW PRESS associated messages displayed, a small amount of center tank fuel maybe indicated. A scavenge system will operate automatically to TRANSFER any remaining center tank fuel to the _____ main tank. Fuel scavenge begins when the left main tank is approximately HALF empty. left. right.

Fuel Pumps Several seconds after display of the CTR L FUEL PUMP or CTR R FUEL PUMP message on EICAS,. power is automatically removed from the respective pump. power need bo be manually removed from the respective pump.

Fuel Pumps The ___________________________________ to provide fuel to the APU when AC power is not available and the APU selector is ON. left main tank contains a DC–powered fuel pump. right main tank contains a AC–powered fuel pump. left main tank contains a AC–powered fuel pump.

FUEL CROSSFEED The VALVE disagreement light illuminates and the EICAS advisory message FUEL CROSSFEED displays if the valve position: does not agree with its switch position. agree with its switch position.

Fuel Configuration Light When the fuel imbalance between the left and right main tanks differ by. 800kg or more, or center fuel pump switches are OFF with more than 600 kilograms in the center tank. 1800kg or more, or center fuel pump switches are OFF with more than 1200 kilograms in the center tank. 600kg or more, or center fuel pump switches are OFF with more than 800 kilograms in the center tank.

Fuel Configuration Light Fuel Configuration (FUEL CONFIG) Light Illuminated (amber). • low fuel. • imbalance. • center tank fuel pumps off with fuel in tanks. • low fuel. • center tank fuel pumps off with fuel in tanks. • low fuel. • imbalance. • left and right tank fuel pumps off with fuel in tanks.

FUELING. The main tanks may also be fuelled manually through over wing fill ports. There are no over wing fill ports for the centre tank. The main tanks and center tank may also be fuelled manually through over wing fill ports. The center tank may also be fuelled manually through over wing fill ports. There are no over wing fill ports for the main tanks.

FUEL QUANTITY A blank indication for any tank and the totalizer indicates: no power or a failure of the quantity sensing system. failure of the quantity sensing system. it´s normal indication.