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crew can manually transfer the tail tank fuel by selecting the guarded PRI (SEC) TAIL TANK
TRANSFER pump switch/light. The white ON indicator illuminates within the switch/light to
indicate satisfactory pump output pressure. If pump output pressure is low, or the pump has
failed, the amber FAIL indicator illuminates within the switch/light, and the PRI (SEC) TAIL TANK
TRANSFER caution EICAS message is displayed. If the transfer is unsuccessful, the crew can
utilize the tail tank fuel DUMP system to reduce the fuel quantity in the tail tank.
Similarly, the AUX TANK HEAVY caution EICAS message indicates excessive auxiliary tank fuel
weight (relative to the tail tank system). Selecting only the MANUAL OVRD switch/light will
override FSCU automatic transfer functions, stopping fuel transfer between the tail and auxiliary
tanks, thereby allowing the auxiliary tanks to deplete to normal levels.
NOTE
When operating in manual override, the selected (PRI or SEC) fuel
pump will not automatically shut off when the tail tank is empty. The
flight crew must monitor manual transfer operations and turn off the
selected pump when the tail tank is empty
FUEL SYSTEM
Description
Vol. 2 12−10−12
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FUEL TRANSFER (CONT'D)
Fuel Transfer Schematic Legend
Figure 12−10−10
FUEL SYSTEM
Description
Vol. 2 12−10−13
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FUEL TRANSFER (CONT'D)
Fuel Transfer Schematic
Figure 12−10−11
FUEL SYSTEM
Description
Vol. 2 12−10−14
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FUEL TRANSFER (CONT'D)
Fuel Dumping
If attempts to transfer fuel from the tail tank to the auxiliary tank fail, the tail tank fuel can be
dumped. Fuel dumping must be carried out with the flaps at 0°.
A guarded DUMP switch/light, powered by the DC battery bus, is located on the FUEL control
panel. Once pressed in, the dump valve is commanded open, and the white OPEN indicator
illuminates on the switch/light. Fuel is dumped at a rate of approximately 100–120 lb/min
(45–55 kg/min). Five minutes after the dump valve is selected OPEN, the DUMP VALVE OPEN
caution EICAS message is displayed, to remind the flight crew that the dump valve is open.
If the dump valve is not in the position commanded by the switch/light, the amber FAIL indicator
will illuminate, and the TAIL DUMP SOV caution EICAS message will be displayed.
Tail Tank Transfer/Fuel Dump Switch/Lights
Figure 12−10−12
NOTE
Fuel may be inadvertently dumped on the ground, via the fuel dump
mast, if the BATT MASTER switch is selected on, and the fuel
DUMP switch is pressed in.
FUEL SYSTEM
Description
Vol. 2 12−10−15
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
FUEL TRANSFER (CONT'D)
Fuel Crossflow (XFLOW)
Whenever there is a fuel imbalance between the two main tanks (more than 400 lb on taxi,
takeoff or landing, or more than 800 lb in flight), the FUEL IMBALANCE caution EICAS message
is displayed.
The three XFLOW switch/lights on the FUEL control panel correspond to three valves in the
crossflow line. The motorized gate-valves, located in the auxiliary tank, are powered by 28 VDC.
Pushing one of the XFLOW switch/lights allows manual fuel transfer between the designated
tanks.
NOTE
The FUEL IMBALANCE message will be triggered in flight whenever
more than 400 pounds’ fuel imbalance exists between the left and
right main tanks, and flaps are set at 20-degree position or more.
XFLOW Switch/Lights
Figure 12−10−13
L (R) TO AUX XFLOW Switch/Lights
Pushing the L (R) TO AUX switch/light opens a valve, which allows fuel from the selected wing
tank into the auxiliary tank. Fuel is then evenly distributed by the transfer ejectors to both LEFT
and RIGHT main tanks. When the fuel imbalance reduces to less than 100 lbs after a 50-second
time delay, the FUEL XFLOW SOV OPEN caution EICAS message will be displayed, to remind
the crew to deselect the appropriate XFLOW switch/light.
NOTE
An electric switch interlock inhibits simultaneous opening of both L
TO AUX and R TO AUX valves.
FUEL SYSTEM
Description
Vol. 2 12−10−16
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
FUEL TRANSFER (CONT'D)
GRAVITY XFLOW Switch/Light
Pushing the GRAVITY XFLOW switch/light opens the gravity crossflow valve, allowing fuel to
flow freely between the main tanks, and to balance evenly. Flying in a slight sideslip with the
　
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