MD-11 Flight Crew Operations Manual
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Fuel -
Description and Operation
Fuel.10.18
6. Verify fill valve operation.
7. Verify fuel temperature probe operation.
• The conditional test will:
1. If more than 681 kilograms of fuel is in the lower auxiliary tank, verifies
lower auxiliary tank pump operation. In addition, if the auxiliary tank is not
full, verifies lower aux fill valve operation.
2. If total usable fuel is more than 27,216 kilograms, verifies ability to fill and
empty upper auxiliary and tail tanks. If upper auxiliary tank is not full,
verifies ability to transfer tail fuel into and out of upper auxiliary tank.
Ballast Fuel Control
The FSC will recognize when ballast fuel is being carried and will keep it in its
proper tank. Ballast fuel may be carried in tank 2, the upper auxiliary tank, or the
tail tank. Only one tank can be assigned for ballast fuel. Tank 2 is allowed to have
only up to 11,340 kilograms of ballast fuel. All or part of the fuel in the upper
auxiliary tank may be ballast. The tail tank cannot contain both ballast and usable
fuel. The fuel must be either all ballast or all usable fuel. The flight crew enters
the amount and location of ballast fuel in the FMS, and the FSC then manages it
appropriately. In the case of the tail tank, two switches on the aft maintenance
panel must also be positioned.
Fuel Dump System Backup
The FSC will back up the manual/mechanical system for fuel dump. The FSC does
not have control of the fuel dump valves. The fuel dump valves are always
controlled by the flight crew. When the first main tank fuel quantity reaches the
undumpable level of about 5,443 kilograms, the transfer pump in that tank will be
shut off and all crossfeed valves will close.
When fuel dump terminates by the flight crew selecting the FUEL DUMP switch
off, the following functions are mechanically performed and backed up by the
FSC:
• Crossfeed valves close.
• Transfer pumps turn off.
• Tank pumps are correctly reconfigured for the amount of fuel remaining.
• Fuel is rescheduled as required.
November 10, 2008
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