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Instrument Flying Handbook Menu>Human
Factors>Illusions
Leading to Spatial Disorientation>Elevator Illusion
An abrupt upward vertical acceleration, as
can occur in an updraft, can stimulate the otolith organs to
create the illusion of being in a climb. This is called elevator
illusion. The disoriented pilot may push the aircraft into a
nose-low attitude. An abrupt downward vertical acceleration,
usually in a downdraft, has the opposite effect, with the disoriented
pilot pulling the aircraft into a nose-up attitude.
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