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status prior to test start, and
• Start refueling
NOTE
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.
FUEL SYSTEM
Description
Vol. 2 12−10−19
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
REFUELING/DEFUELING SYSTEM (CONT'D)
Fuel/Defuel Panel Operation Test
Figure 12−10−14
FUEL SYSTEM
Description
Vol. 2 12−10−20
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
REFUELING/DEFUELING SYSTEM (CONT'D)
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 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
indicate after the three tank levels have equalized (approximately one to eight minutes later).
Override Button
The override button allows fueling/defueling of the auxiliary or tail tanks individually, provided
the high-level sensor has not been triggered in the selected tank system. The override button
must be held for the duration of individual auxiliary or tail tank fueling/defueling.
FUEL SYSTEM
Description
Vol. 2 12−10−21
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
REFUELING/DEFUELING SYSTEM (CONT'D)
WARNING
IF INDIVIDUAL FUELING OF AUXILIARY OR TAIL TANKS HAS
BEEN CARRIED OUT USING THE OVERRIDE BUTTON, THE C
OF G LIMITS MUST BE CALCULATED MANUALLY.
FUEL/DEFUEL Panel Pressure Refueling
Figure 12−10−15
FUEL SYSTEM
Description
Vol. 2 12−10−22
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
REFUELING/DEFUELING SYSTEM (CONT'D)
Pressure Refueling (Auxiliary Tanks)
Figure 12−10−16
FUEL SYSTEM
Description
Vol. 2 12−10−23
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
REFUELING/DEFUELING SYSTEM (CONT'D)
Refuel/Defuel System Schematic
Figure 12−10−17
FUEL SYSTEM
Description
Vol. 2 12−10−24
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
REFUELING/DEFUELING SYSTEM (CONT'D)
Overwing Gravity Refueling
Gravity refueling will average 7% less volume than pressure refueling in the main and auxiliary
　
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