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FUEL SYSTEM
Description
Vol. 2 12−10−8
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FUEL DISTRIBUTION (CONT'D)
Fuel Distribution Schematic Legend
Figure 12−10−7
FUEL SYSTEM
Description
Vol. 2 12−10−9
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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 avionic/electronic 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 in 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 (900 pounds per hour if SB 604–28–007 not installed).
Rotor-Burst Protection Shroud
Because the tail tank lines run past the engines, a rotor-burst protection shroud covers the tail
tank fuel line 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.
The FSCU shuts off the tail tank transfer pumps when the tail tank system is empty or when the
auxiliary tank system is full.
An amber AUTO INHIB light on the FUEL control panel illuminates to indicate that rotor-burst
protection shroud pressure is low, and all automatic fuel transfer modes are disabled. This is
accompanied by the AUTO TAIL XFER INHIB caution EICAS message.
Normal operation of the automatic tail tank transfer pumps will not illuminate the switch/lights on
the FUEL control panel. If the primary or secondary tail transfer pump fails during automatic
operation, the FSCU switches to the other pump and displays the PRI (SEC) TAIL XFER FAIL
status EICAS message.
FUEL SYSTEM
Description
Vol. 2 12−10−11
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FUEL TRANSFER (CONT'D)
Tail Tank Transfer/Fuel Dump Switch/Lights
Figure 12−10−9
NOTE
Normal automatic fuel transfer between tail and auxiliary tanks is
inhibited while the aircraft is on the ground (weight-on-wheels
sensed by the proximity sensing electronic unit). On the ground,
transfer can only be accomplished by pressing the MANUAL OVRD
switch/light and selecting the PRI or SEC transfer pump.
FSCU Manual Transfer Operation
The FSCU alerts the crew of tail tank fuel transfer abnormalities by EICAS messages. The
FUEL control panel allows the crew to override the FSCU automatic fuel transfer system.
The TAIL TANK HEAVY caution EICAS message alerts the crew of excessive tail tank fuel
weight (relative to the auxiliary tanks). By pressing the guarded MANUAL OVRD switch light, the
　
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