787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Fuel Chapter 12
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 12.20.1
12.20 Fuel-System Description
Fuel20 System DescriptionSystem Description
Introduction
The fuel system supplies fuel to the engines and the APU. The fuel is contained in
a center tank, and left and right main tanks.
(Refer to Engine Fuel System
in Chapter 7, Section 20, for additional
information.)
Fuel Quantity
Fuel quantity is measured by sensors in each tank. Total fuel quantity is displayed
on the primary EICAS display. Tank quantities and total fuel quantity are
displayed on the FUEL synoptic display.
Expanded fuel indications showing the left main, center, and right main tank
quantities are displayed when non-normal conditions occur.
Fuel Temperature
Fuel temperature is displayed on the primary EICAS display. The temperature is
normally displayed in white. It is displayed in amber when the fuel temperature
approaches maximum or the fuel freeze temperature entered on the flight
management system CDU. During jettison, the TO REMAIN quantity replaces the
EICAS display static air temperature and fuel temperature indications.
Fuel temperature and minimum fuel temperature are also displayed on the fuel
synoptic display.
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 center tank fuel pumps are override/jettison pumps. These pumps have a
higher output pressure than the left and right main tank fuel pumps. The center
tank pumps override the main tank pumps so that center tank fuel is used before
wing tank fuel.
When the main tank fuel pump switches are off, the switch PRESS lights
illuminate and the EICAS advisory messages FUEL PUMP (L, R, FWD, or AFT)
display. When the center fuel pump switches are off, the switch PRESS lights and
pump pressure EICAS messages are inhibited.
October 31, 2007
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