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Total capacity 15722 7130 2329 1939 8815
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
Table 12-2
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.
Unusable Fuel
Table 12-3
FUEL SYSTEM
For Training Purposes Only
May 03
12-21
P I LOT T R A I N I N G GU I D E
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 2500 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 Operation 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 white 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
status prior to test start, and
• start refueling
The functional test of the refueling system must be conducted
prior to each refueling/defueling. During the test, the high-level
sensors generate a false high-level signal to the FSCU, which
then closes the refuel shutoff valves.
NOTE
FUEL SYSTEM
12-22 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
FUEL / DEFUEL Panel Operation Test
Figure 12-14
P604_12_024
POWER
FUEL
OFF
DEFUEL
HIGH LEVEL SENSORS
L MAIN TAIL AUX R MAIN
OPEN
SOV
CLOSED
OVERRIDE
SHUT
OFF
TEST
2. ALL SOV SWITCHES SELECTED OPEN
POWER
FUEL
OFF
DEFUEL
HIGH LEVEL SENSORS
L MAIN TAIL AUX R MAIN
OPEN
SOV
CLOSED
OVERRIDE
SHUT
OFF
TEST
1. FUEL TRUCK CONNECTED AND PRESSURE (MAX 50 PSI) ESTABLISHED
POWER
FUEL
OFF
DEFUEL
HIGH LEVEL SENSORS
L MAIN TAIL AUX R MAIN
OPEN
SOV
CLOSED
OVERRIDE
SHUT
OFF
TEST
3. PRESS SHUTOFF TEST BUTTON
FUEL SYSTEM
For Training Purposes Only
May 03
12-23
P I LOT T R A I N I N G GU I D E
Pressure Refueling
For partial fuel loads it is recommended to fill the main tanks completely first, then the
auxiliary and tail tanks as required. For safety reasons and to maintain proper C of G,
the FSCU will prevent refueling of the auxiliary tank without the tail tank being
selected. The auxiliary and tail tanks must always be selected together and the refuel
SOVs must be confirmed open to ensure proper filling of the auxiliary and tail tanks.
To open the shutoff valve (SOV) for the respective tank, toggle the appropriate SOV
switch to OPEN. When the tank is full, the respective HIGH-LEVEL SENSOR light
and SOV CLOSED light will illuminate to indicate the SOV has closed automatically.
Should this fail, as evidenced by fuel dumping overboard from the vent system, toggle
the switch down to manually close the SOV.
In order to achieve maximum fuel quantity in the auxiliary tank, pressure must be kept
constant at the FUEL/DEFUEL ADAPTER. If an interruption of 30 seconds or more
during refueling occurs, the FSCU will close the TAIL SOVs and the AUX SOV,
preventing fuel from going to these tanks. If this occurs, the FSCU may be overridden
by holding the OVERRIDE button on the FUEL/DEFUEL panel, or, the POWER
switch may be cycled OFF then to FUEL. The affected TAIL and AUX SOV(s) will
reopen, allowing more fuel into the tanks unless the HIGH LEVEL SENSOR light of
the affected tank has been triggered.
If a long interruption occurs during refueling, and depending on how much fuel there
is in the auxiliary tank at this stage, the forward and aft auxiliary tanks will not be
further pressurized by the ejectors and their vent valves will open. Their level will
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