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Restrictor
Press Switch
P604_12_022
TS Temperature Sensor
FUEL SYSTEM
12-12 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
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.
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 1800 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.
FUEL SYSTEM
For Training Purposes Only
Sept 04
12-13
P I LOT T R A I N I N G GU I D E
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.
Tail Tank Transfer Switch/Lights
Figure 12-9
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.
NOTE
P604_12_020
ON
FAIL
MANUAL
AUTO
INHIB
ON
FAIL
TAIL TANK TRANSFER DUMP
PRI MANUAL
OVRD
SEC DUMPS AT 0º
FLAPS ONLY
OPEN
FAIL
FUEL SYSTEM
12-14 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
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 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
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