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• Wing tanks only if the required fuel load is equal to or less than the wing tank
capacity
• Wing tanks full and the remainder in the center tank if the required fuel load is
greater than the total wing capacity
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
For Training Purposes Only
Sept 04
11-33
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
REFUEL/DEFUEL PANEL
PRESEL
INCR
DECR
CLOSE
START
STOP/
SOV
TEST
MANUAL AUTO
OFF
REFUEL
DEFUEL
REFUEL
REFUEL
NO AFT
LEFT CTR RIGHT
OPEN
AFT
MANUAL
CL
REFUEL/DEFUEL PANEL
TOTAL PRESEL
LEFT CENTER RIGHT
AFT
MASTER
OFF
INCR ON
DECR
CLOSE
SHUT
OFF
START
AFT
ON
AUTO
REFUEL
START
REFUEL
DEFUEL STOP OFF
A
R
LEFT
LEFT RIGHT
CTR AFT
TOTAL PRESEL
CTR RIGHT
OPEN
AFT
MANUAL AUTO REFUEL
CL
REFUEL/DEFUEL PANEL
30000 LB 30000 LB
10050 9950
8000 2000
O
MA ER
FUEL QUANTITY Displays
Displays current tank quantities.
PRESELECT Display
Indicates preselected total quantity.
LEFT/CTR/RIGHT/AFT
MANUAL Switches
Manually controls
valves open or closed.
MODE SELECTOR Switch
REFUEL
AUTO REFUEL
DEFUEL
– Enables manual
refueling.
– Enables auto
refueling.
– Enable manual defuel.
START/STOP Switch
Starts or stops automatic
refueling.
AFT ON/OFF Switch
Enables/disables
automatic refueling of the
aft tank.
SHUT OFF TEST Switch
Performs test of the
automatic shutoff system.
MASTER Switch
Applies APU battery
power to refuel/defuel
system.
INCR/DECR Switch
Increases or decreases PRESEL
quantity for AUTO refueling
LEFT/CTR/RIGHT/AFT
MANUAL Switches
Manually controls
valves open or closed.
MODE SELECTOR
OFF
AUTO / REFUEL
AUTO / REFUEL NO AFT
MANUAL / REFUEL
DEFUEL
–
–
–
–
–
No power to panel
Selected when aircraft to be
fueled automatically to a preselected fuel load.
Selected when no fuel
required in aft tank during AUTO refueling.
Selected when fuel tanks filled
manually by operator.
Selected when defueling
aircraft by manually opening tank SOV’s.
MANUAL /
PRESEL INCR/DECR
Switch
Increases or decreases
the preselected quantity
for AUTO refueling
START/STOP/SOV TEST
Switch
START
STOP/SOV TEST
– Starts automatic
refueling
– Stops
automatic refueling and
performs SOV test.
Quantity Displays
EARLIER VERSION
GX_11_024
LATER VERSION
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
11-34 For Training Purposes Only
Sept 04
FAULT REPORTING
Fault reporting is in the form of error messages which will appear in the display
windows of the refuel/defuel panel.
The following illustration represents one example of fault reporting:
ERROR MESSAGES
The following messages may be displayed on the refuel/defuel panel if a fault exists:
INHIBIT
In manual refuel or defuel mode, displayed when a tank switch is in the OPEN
position. In pressure defuel mode, displayed when an engine is on (no fire handles
pulled). In auto mode, displayed when the preselected fuel quantity is invalid, airplane
is in CAIMS maintenance mode, or the SOV shutoff test fails.
FULL
Displayed when the high level shutoff has been activated.
LOAD ERROR
In auto refuel mode, displayed when an invalid fuel distribution is selected. Example,
one tank contains more fuel than the target quantity assigned by the automatic
distribution.
IMBAL
Displayed when a predetermined fuel quantity imbalance exists between the left and
right wings.
REPEATER
Displayed in the PRESEL window of the external Refuel/Defuel Panel when two
panels are powered ON. The panel located in the flight compartment is in control and
the outside panel provides quantity display only.
_ _ _ _ _ _
Dashes will be displayed for a fuel quantity if the computed value is invalid.
FAILED
Displayed in the PRESEL window if the Refuel/Defuel Panel is not functional.
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