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Auxiliary Fuel Tank

Fuel tank installed to make additional fuel available for increasing the flight range of that airplane. The term auxiliary means that the tank is secondary to the airplaneā€™s main fuel tanks, i.e., the functions of the main tanks are immediately available and operate without immediate supervision by the flightcrew in the event of failure or inadvertent depletion of fuel in an auxiliary tank. Auxiliary tanks are usually intended to be emptied of usable fuel during flight and have been installed in various locations including center wing structure, horizontal stabilizers, wings, and cargo compartments.

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