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heavy wing up can accelerate the balancing process. When the GRAVITY XFLOW switch/light
is selected, the OPEN indicator illuminates to indicate gravity crossflow valve operation. There
are no EICAS messages associated with gravity crossflow valve operation. The flight crew must
monitor main tank fuel quantity indications to determine when the imbalance has been
corrected.
An L (R) TO AUX crossflow switch/light should not be selected in combination with the
GRAVITY XFLOW switch/light.
NOTE
GRAVITY XFLOW valve operation on the ground should be closely
monitored, since fuel will flow from the higher wing to the lower wing
without any EICAS messages to indicate when the imbalance has
been corrected.
REFUELING/DEFUELING SYSTEM
Description
A single-point refuel/defuel adapter is located in the right wing root area. The FUEL/DEFUEL
control panel is situated above the adapter on the side of the fuselage. The FUEL/DEFUEL panel
is used to test the integrity of the components of the fuel system, and to select the individual fuel
tanks for refueling and defueling.
An optional refuel/defuel panel is installed on the flight deck behind the copilot seat. This panel has
priority over the external panel, and displays individual fuel tank quantity information and valve
status.
Both internal and external FUEL/DEFUEL panels are normally powered by the APU BATT DIR
BUS.
To prevent overfilling the tanks, each tank system is equipped with high level sensors. The high
level sensor closes the associated shutoff valve(s) when the respective tank is filled to capacity.
The tank vent system ensures overfill protection during refueling. Manual vent relief valves
augment the normal vent system to prevent main and auxiliary tank overpressure during refueling.
FUEL SYSTEM
Description
Vol. 2 12−10−17
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
REFUELING/DEFUELING SYSTEM (CONT'D)
NOTE
Maximum usable fuel capacities are attainable through pressure
refueling only.
Max Usable Capacities Attainable Through Pressure Refueling
LOCATION POUNDS KILOS
GALLONS
(US)
GALLONS
(IMP)
LITERS
Left main tank 4,874 2,210 722 601 2,733
Right main tank 4,874 2,210 722 601 2,733
Center aux tank 5,066 2,296 750 625 2,839
Forward aux tank 1,465 664 217 181 821
Aft aux tank 641 291 95 79 360
Left saddle tank 903 409 134 111 506
Right saddle tank 903 409 134 111 506
Tail cone tank 1,341 608 199 165 752
Total capacity 20,067 9,097 2,973 2,474 11,250
Based on a fuel density of 6.75 lb (3.06 kg)/US gallon, and aircraft parked with 0.5° nose down and wings
level.
Max Usable Capacities Attainable Through Overwing Refueling
LOCATION POUNDS KILOS
GALLONS
(US)
GALLONS
(IMP)
LITERS
Left main tank 4,523 2,051 670 558 2,536
Right main tank 4,523 2,051 670 558 2,536
Auxiliary tank 6,676 3,028 989 823 3,743
Total capacity 15,722 7,130 2,329 1,939 8,815
Based on a fuel density of 6.75 lb (3.06 kg)/US gallon, and aircraft parked with 0.5° nose down and wings
level.
Unusable Fuel
LOCATION POUNDS KILOS
GALLONS
(US)
GALLONS
(IMP)
LITERS
Total capacity 129 59 19 16 72
Unusable fuel is the quantity of trapped and residual fuel.
FUEL SYSTEM
Description
Vol. 2 12−10−18
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
REFUELING/DEFUELING SYSTEM (CONT'D)
Components and Operation
FUEL/DEFUEL Panel
The FUEL/DEFUEL Panel has controls for testing the systems’ functionality and to initiate or
terminate selective tank fueling or defueling. Maximum pressure during refueling is 50 psi, and
maximum defueling pressure is negative 8 psi. The maximum fuel imbalance for structural
integrity is 2,500 lb between the two main tanks.
To ensure FUEL/DEFUEL panel power has been turned off, a power kill switch disconnects the
panel from the APU battery direct bus when the panel is stowed and the door closed.
FUEL/DEFUEL Panel Operational Test
To complete the test:
• Fuel adapter and pressure must be available from the tender (max 50 psi)
• Place POWER switch to the FUEL position
• Select all SOV switches to the OPEN position (all five white SOV OPEN lights illuminate)
• Push and hold the SHUTOFF TEST switch (to check automatic fueling shutoff feature),
• Verify that:
• All four white HIGH-LEVEL SENSOR lights illuminate
• All five SOV OPEN lights extinguish, and
• All five green SOV CLOSED lights illuminate
• Release the SHUTOFF TEST button to verify that all the above lights revert to their
　
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