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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 12.10.12
Oct 05/06
TAIL TANK TRANSFER 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 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 XFER PUMP 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
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