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when the system is selected on.
P I LOT T R A I N I N G GU I D E
GLOBAL 5000 DIFFERENCES
APPENDIX 1
Appx-38 For Training Purposes Only
Sept 04
REFUEL/DEFUEL SYSTEM
Pressure refueling/defueling operations are controlled from the refuel/defuel control
panel. Pressure refueling can be accomplished in “MANUAL” or “AUTO” mode of
operation.
Gravity filling via a filler point is also provided for the wing and center tanks.
PRESEL
INCR
DECR
CLOSE
START
STOP/
SOV
TEST
MANUALAUTO
OFF
REFUEL
DEFUEL
REFUEL
REFUEL
NOAFT
LEFTCTRRIGHT
OPEN
AFT
MANUAL
CLO
REFUEL/DEFUELPANEL
TOTAL PRESEL
LEFTRIGHT CENTER
AFT
GRAVITY FILL CAP
Grounding
Points
Grounding
Point
Proximity
Sensor
PRESEL
INCR
DECR
CLOSE
START
STOP/
SOV
TEST
MANUAL AUTO
OFF
REFUEL
DEFUEL
REFUEL
LEFT CTR RIGHT
OPEN
MANUAL
C
REFUEL/DEFUEL PANEL
TOTAL PRESEL
LEFT CENTER RIGHT
GX_appx_021
Grounding
Point
REFUEL/DEFUEL
ACCESS PANEL
REFUEL/DEFUEL PANEL
For Training Purposes Only
Sept 04
Appx-39
P I LOT T R A I N I N G GU I D E
GLOBAL 5000 DIFFERENCES
APPENDIX 1
REFUEL DISTRIBUTION
Refer to Refuel Schematic for component location, recognition, and operation.
All fuel tanks can be refueled either automatically (by the FMQGC) or manually (by
the refuel/defuel panel). The recommended pressure is 50 psig for pressure fueling.
A balance line in each tank is used during refueling to transfer fuel to the most
outboard section of the wing.
The filling sequence of the wing compartment during pressure refueling is as follows:
• Cell 2 is filled directly by the refuel system, fuel flows inboard by gravity into
• Cell 1, which is the inboard section including the feed tank. After inboard cells 1
and 2 are completely filled
• Cell 3 is filled to capacity by overflow of cell 2 fuel through the balance tube
connecting cells 2 and 3
High level sensors installed in each tank automatically close the refuel/defuel SOVs, if
the maximum fuel level capacity is reached. Relief valves augment the normal vent
system to prevent overpressure in case of overfilling a tank.
As with the wing tanks, automatic refueling of the center tank is controlled by the
FMQGC, with automatic shutoff commanded by the high level sensor.
P I LOT T R A I N I N G GU I D E
GLOBAL 5000 DIFFERENCES
APPENDIX 1
Appx-40 For Training Purposes Only
Sept 04
REFUEL/DEFUEL SCHEMATIC
FUEL DISTRIBUTION LINES
LEFT MAIN REFUEL
RIGHT MAIN FUEL
CENTE REFUEL/DEFUEL
AFT REFUEL/DEFUEL
AND MAIN DEFUEL
R
GX_appx_022
CELL 1 CELL 2 CELL 3
REFUEL
DEFUEL
PANEL
RV
RV
H H
H H
RV
Relief Valve
Crossfeed
Valve
Suction Defuel
Check Valve
High Level
Sensor
Balance
Tube
Single Point
Refuel Adaptor
Baffled Ribs
Defuel Shutoff
Valve
Center Tank
Refuel/Defuel
Check Valve
Refuel/Defuel
Manifold
Shutoff Valves
TO
FMQGC
For Training Purposes Only
Sept 04
Appx-41
P I LOT T R A I N I N G GU I D E
GLOBAL 5000 DIFFERENCES
APPENDIX 1
NORMAL FUEL LOADING
The normal fuel loading logic as planned by the FMQGC is as follows: Note that when
the refuel process starts, fuel flows to all of the tanks at the same time until they reach
the planned amount.
• Wing tanks only if the required fuel load is equal to or less than the wing tank
capacity
• Any fuel in excess capacity of the wing tanks is placed in the center tank
NOTE
The fuel computer always strives to keep between 0 and 400 lb
maximum lateral imbalance, however, the software allows the
imbalance to reach 1100 lb before shutting down and going into
INHIB mode.
Fuel Imbalance Limitations
WING TANK FUEL LOAD GROUND/CONFIGURED FOR
TAKEOFF/LANDING
FLIGHT - CLEAN
CONFIGURATION
Less than 19,450 lb 1,100 lb 1,100 lb
19,450 to 20,250 lb 1,100 to 600 lb 1,100 lb
Greater than 20,250 lb 600 lb 1,100 lb
P I LOT T R A I N I N G GU I D E
GLOBAL 5000 DIFFERENCES
APPENDIX 1
Appx-42 For Training Purposes Only
Sept 04
REFUEL/DEFUEL PANEL
PRESEL
INCR
DECR
CLOSE
START
STOP/
SOV
TEST
MANUAL AUTO
　
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