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Wing Tank ........................................................................................................... 11-39
Center Tank ........................................................................................................ 11-39
Aft Tank............................................................................................................... 11-39
Suction Defuel........................................................................................................... 11-39
Pressure Defueling ................................................................................................... 11-40
Later Version RDCP Refuel/Defuel Procedures ....................................................... 11-40
EICAS Messages...................................................................................................... 11-41
EMS Circuit Protection.............................................................................................. 11-45
For Training Purposes Only
Sept 04
11-1
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
INTRODUCTION
This chapter describes the fuel system for the Global Express aircraft.
Appendix 1 at the end of this book has a description of the Global 5000 fuel system. If
you operate a Global 5000, do not read this chapter, proceed directly to the appendix.
Fuel is contained in a wet wing box structure, which is sealed to form the three main
separate wing tanks, and a smaller quantity of fuel is carried in a separate aft fuselage
tank. The tanks are vented to atmosphere and slightly pressurized by an air scoop
located on the lower surface of each wing. A scavenge pump purges fuel from the vent
lines and a climb vent, located in each main wing tank, provides ventilation when the
airplane is in a nose up attitude.
Each engine is supplied with fuel from its respective feed tank which contains two
alternating current or AC primary pumps, and one Direct Current (DC) backup (or
Aux) electrical boost pump. The transfer system maintains the feed tanks full during
all attitudes, and provides automatic transfer of fuel from the center tank and aft tank
to the main wing tanks.
Lateral balance between left and right main tanks is controlled automatically by the
Fuel Management and Quantity Gauging Computer (FMQGC), or manually through
switch selections in the flight compartment.
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
11-2 For Training Purposes Only
Sept 04
Flight deck control is provided on the overhead panel, and fuel quantity and warnings
are displayed on EICAS.
A single point pressure refuel/defuel adapter is provided which is connected to a
manifold containing shutoff valves. Pressure refueling can be done either
automatically or manually. Gravity filling is provided for each wing tank and for the
center tank.
A dual channel FMQGC continuously monitors the following:
• Fuel quantity indicating
• Left, right engine and APU feed
• Wing to wing balance (wing XFER)
• Center tank transfer
• Aft tank fuel transfer
• Refuel/Defuel
GX_11_001
Main Wing Tank
Engine Driven
Pumps
AC Motor Pumps
(transfer)
*
Feed Tanks
DC Pumps
(start, emergency
and wing transfer)
AC Motor Pumps
(transfer)
AC Motor Pumps
(engine feed)
Center Tank
AFT Tank*
Note
*Not on Global 5000
For Training Purposes Only
Sept 04
11-3
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
Any fault detected by the fuel system computer is annunciated on Engine Indication
and Crew Alerting System (EICAS) in the form of a visual and/or aural alert, and/or
maintenance diagnostics.
FUEL TANKS
All fuel is carried in three integral tanks (left wing, right wing and center wing) and a
smaller aft fuselage tank (contained in a structurally enclosed bladder).
The inboard section of each wing is designated as a feed tank, from which each engine
draws its fuel. Fuel flows from the outboard sections of each wing tank, into the feed
tank (by gravity), through swing check valves in the baffles of each main tank. The
check valves allow fuel flow in the inboard direction only. This will restrict large fuel
movements, and limit center of gravity shifts in airplane changes of attitude. Fuel is
also transferred into the feed tanks, from the center fuselage and aft fuselage tanks by
the transfer system.
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
11-4 For Training Purposes Only
Sept 04
DESCRIPTION
FUEL SPECIFICATIONS
For information on fuel additives, temperature limitations and approved fuels, refer to
　
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