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FUEL SYSTEM
Description
Vol. 2 12−10−17
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
REFUELING/DEFUELING SYSTEM (CONT'D)
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.
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
status prior to test start; and
• Start refueling.
NOTE
The functional test of the refueling system must be conducted prior
to each refueling. During the test, the high-level sensors generate a
false high-level signal to the FSCU, which then closes the refuel
shutoff valves.
FUEL SYSTEM
Description
Vol. 2 12−10−18
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
REFUELING/DEFUELING SYSTEM (CONT'D)
Fuel/Defuel Panel Operation Test
Figure 12−10−14
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.
FUEL SYSTEM
Description
Vol. 2 12−10−19
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
REFUELING/DEFUELING SYSTEM (CONT'D)
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 drop, and equalize with the center
auxiliary tank. This will cause the level in the center auxiliary tank to rise, and if the level is high
enough, it may trigger the auxiliary tank HIGH LEVEL SENSOR. If this is the case, the FSCU
will not allow the AUX SOV to reopen, and only gravity refueling will be possible to fill the
remaining volume of the auxiliary tanks.
Auxiliary Tank Quantity Indication
Since the auxiliary tank fuel quantity indication is generated using the center and forward
auxiliary tank capacitance probes, the cockpit reading for the auxiliary tank during refueling
does not immediately reflect actual auxiliary tank contents. Actual tank contents will only
　
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