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Mar21-08, 03:47 PM
In fact in a movie, i think it was air force one or something.... they show an apu( aux power unit) that pops out with a turbine on it, when the aircraft has a loss of power for some reason.
Its called a Ram Air Turbine (RAT), I used to work on them. As Danger eluded to its purpose it to allow control of the aircraft during an emergency glide.