787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Fuel -
System Description
Copyright © The Boeing Company. See title page for details.
12.20.6 D615Z003-TBC
APU Fuel Feed
APU fuel is supplied from the left fuel manifold. APU fuel can be provided by any
AC fuel pump supplying fuel to the left fuel manifold or by the left main tank DC
fuel pump.
On the ground, with the APU switch ON and no AC power available, the DC
pump runs automatically. With AC power available, the left aft AC fuel pump
operates automatically, regardless of fuel pump switch position, and the DC fuel
pump turns off.
Fuel Jettison
The fuel jettison system allows jettison from all fuel tanks. Fuel jettison is
accomplished by opening the center tank jettison isolation valves and the main
tank defuel/isolation valves. Fuel flows into the jettison/refuel manifold and is
then jettisoned overboard through jettison nozzle valves inboard of each aileron.
Fuel jettison is initiated by pushing the FUEL JETTISON ARM switch to select
ARMED. The jettison system automatically sets the fuel–to–remain to the
maximum landing weight (MLW) fuel quantity. The TO REMAIN quantity
replaces fuel temperature on the EICAS display.
Pull on and rotate the TO REMAIN selector to manually decrease or increase the
TO REMAIN quantity.
In flight, when the FUEL JETTISON ARM switch is armed and either fuel jettison
NOZZLE switch is pushed ON, the defuel/isolation valves and jettison isolation
valves open. The fuel system automatically positions the valves as required to
jettison fuel based on the selected TO REMAIN quantity.
The nozzles cannot open on the ground, regardless of switch positions.
In flight, jettison time is displayed in minutes on the fuel synoptic when the
jettison arm switch is positioned on while in the air. Jettison automatically stops
when a value just above the FUEL TO REMAIN quantity is reached. The system
closes the defuel/isolation valves and the jettison isolation valves.
[Option – English / Metric units]
At least 8700 pounds / 3900 kilograms of fuel remains in each main tank after
jettison is complete.
February 13, 2009
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