KLM MD-11 - General; Fuel System Controller (FSC)

MD-11 Flight Crew Operations Manual
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Fuel Chapter Fuel
Description and Operation Section 10
Fuel.10.1
Fuel.10 Fuel-Description and Operation
General
The MD-11 fuel system is designed for the use of commercial turbine fuels.
Always refer to the MD-11 Flight Crew Operating Manual Operating Procedures,
Limitations section or the FAA approved Airplane Flight Manual (AFM) for
possible fuel type limitations.
A Fuel System Controller (FSC) is installed on the aircraft. It is a control device
which contains two microprocessors and a control relay system. A second control
device, the Ancillary Fuel System Controller (AFSC), is installed for additional
control. The FSC and the AFSC together provide complete control of fuel system
functions.
FSC and AFSC control of the fuel system components is arranged so that in case
of failure of either the FSC or AFSC, the remaining device can control the fuel
system.
The FSC is capable of either automatic or manual operation. The crew may choose
to operate the system in manual mode, or in certain failure conditions, the system
may automatically revert to manual mode.
In manual mode the crew controls all fuel system functions (engine feed, fuel
transfer and crossfeed) with controls on the FUEL control panel.
Fuel system indications are displayed on the Engine and Alert Display (EAD), the
System Display (SD) and FUEL control panel.
Fuel System Controller (FSC)
FSC automatic functions include the following functions:
• Supplies fuel to the engines and APU.
• Checks and maintains the fuel schedule.
• Maintains a fuel efficient CG by transferring fuel to and from the tail tank.
• Monitors fuel temperature and starts cold fuel recirculation to prevent fuel
from freezing.
• Recognizes when ballast fuel is being carried and keeps it in its proper
tank.
• Backs up manual/mechanical commands for fuel dump.
• Takes appropriate corrective action for early transfer or no transfer of tip
tank fuel.
• Equalizes tank quantities during low fuel flight.
• Maintains wing fuel quantity balance.
October 02, 2006