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capacity. A float valve, located in the forward area of each main tank, prevents this transfer until
main tank fuel quantity is at or below 93% capacity.
Engine Fuel Shutoff Valves
One electrically controlled engine fuel shutoff valve (“firewall” SOV) is installed on each engine
fuel feed line, ahead of the engine-driven pump. When activated by pushing the L (R) ENG
FIRE PUSH switch/light on the pilot’s or copilot’s glareshield, the SOV will close, stopping the
flow of fuel to the engine, and the BOTTLE ARMED PUSH TO DISCH switch/lights will
illuminate. Successful closing of the engine fuel shutoff valve is indicated by a L (R) ENG SOV
CLOSED advisory EICAS message. If the valve fails to close, a L (R) ENG SOV caution EICAS
message is displayed.
The engine fuel shutoff valves are powered by the DC emergency bus. For additional
information, see Chapter 9, Fire Protection.
Fuel Filter
The engine-driven pumps are each equipped with a fuel filter. The filters are mounted adjacent
to the oil tank within the engine nacelle, and are monitored for contamination by an impending
bypass switch. An indication of impending bypass (filter clogged) is the L (R) FUEL FILTER
caution EICAS message.
Wash Filter
The wash filters are installed along the motive flow fuel feed lines, from the engine-driven pump
to the main and scavenge ejector pumps. The wash filter separates ice crystals, which may
have formed in the fuel, and channels them to the larger main ejector pump, thus protecting the
smaller scavenge ejector pump from possible clogging. There are no cockpit indications
associated with wash filter operation.
FUEL SYSTEM
Description
Vol. 2 12−10−8
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FUEL DISTRIBUTION (CONT'D)
Fuel Distribution Schematic Legend
Figure 12−10−7
FUEL SYSTEM
Description
Vol. 2 12−10−9
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FUEL DISTRIBUTION (CONT'D)
Fuel Distribution Schematic
Figure 12−10−8
FUEL TRANSFER
Description
During normal operations, fuel transfer from the tail tanks to the auxiliary tanks is controlled and
monitored automatically by the FSCU. After initiating the fuel transfer, the FSCU monitors the
operation to prevent CG excursions beyond acceptable forward and aft limits.
FUEL SYSTEM
Description
Vol. 2 12−10−10
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FUEL TRANSFER (CONT'D)
Transfer of fuel from the tail tanks to the auxiliary tanks may be interrupted automatically by the
FSCU, or manually by the flight crew, should a malfunction occur.
Components and Operation
Fuel System Computer Unit (FSCU)
The FSCU is a two-channel computer located in the underfloor avionics bay. Its main functions
are fuel quantity gauging, tail tank to auxiliary tank automatic fuel transfer, and automatic
refueling shutoff. Channel 1 of the FSCU is the primary controller, and channel 2 automatically
replaces channel 1 in the event of failure.
FSCU outputs are used by the data concentrator units (DCUs) for fuel quantity displays, EICAS
messages, and switch/lights on the FUEL control panel.
The FSCU is powered by the APU battery direct bus, DC essential bus, DC battery bus, and DC
bus 1.
Tail Tank Transfer Pumps
Two tail tank transfer pumps (primary and secondary) are installed at the sump of the tail tank
system. They transfer fuel from the tail tank system to the auxiliary tank system at a constant
rate of 1,800 pounds per hour.
Rotor-Burst Protection Shroud
Because the tail tank lines run past the engines, a rotor-burst protection shroud covers the tail
tank fuel lines in this area. The shroud is pressurized with nitrogen and monitored by the FSCU.
Should a rotor burst rupture the line, pressure will be lost from the shroud, and tail tank fuel
transfer will be inhibited. The AUTO TAIL XFER INHIB caution EICAS message will be displayed,
and the amber AUTO INHIB switch/light will illuminate on the FUEL control panel. Manual
override is available to the flight crew if the shroud is depressurized for non-engine-related
reasons, by pushing the TAIL TANK TRANSFER MANUAL OVRD switch/light on the FUEL
control panel.
FSCU Automatic Transfer Operation
The FSCU receives fuel quantity information from four level sensors in the auxiliary and tail tank
systems. The FSCU uses this information to control tail tank fuel transfer by starting and
stopping the primary or secondary tail tank transfer pumps in accordance with a fixed schedule.
　
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