MD-11 Flight Crew Operations Manual
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Fuel -
Description and Operation
Fuel.10.4
Tank Capacity Chart
NOTE: After engine start, actual fuel on board (FOB) is used for gross
weight calculations. The flight management system (FMS) display
changes to show, along with FOB, the sensors used for FOB
calculation. The pilot may select or clear the sensor(s) to be used for
calculating FOB, or may re-initialize FOB by entering a new value.
NOTE: These approximate usable fuel capacities assume a density of
0.803 kilograms per liter.
Engine Feed System
The engine feed system is controlled and monitored by the FSC. Each engine is
normally supplied fuel by an independent system from the respective main tank.
Engines are fed by tank boost pumps through fire shutoff valves to the engine
pump inlets. The wing engine fire shutoff valves are electric. The tail engine has
two fire shutoff valves, both mechanical. The boost pumps are driven by ac
motors.
Tank 1 and tank 3, which feed the wing mounted engines, have three pumps each.
These three pumps are:
• One forward mounted boost pump.
• One aft mounted boost pump.
• One aft mounted transfer pump.
TANK LITERS KILOGRAMS
Tank 1 (Left Wing) 22,873 18,365
Tank 2 (Center) 36,177 29,048
Tank 3 (Right Wing) 22,873 18,365
Aux Tank Upper
Compartment
49,205 39,510
Aux Tank Lower
Compartment
6,215 4,990
Horizontal Stabilizer Tank 7,411 5,950
Manifolds & Engines 344 277
TOTALS 146,142 117,345
September 03, 2007
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