undrainable fuel/oil

undrainable fuel/oil
The amount of fuel and oil that remains in the system after draining. This fuel or oil is not usable in flight. The undrainable oil and fuel are considered part of the aircraft’s empty weight. Also called trapped fuel.

Aviation dictionary. 2014.

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Look at other dictionaries:

  • residual fuel and oil — The unusable fuel and undrainable oil in an aircraft. These are taken into account when calculating the empty weight of an aircraft …   Aviation dictionary

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