Gomez ) Examples ``The Leans . This is the most common aviation illusion , caused by a sudden return to a level orientation after a prolonged turn unnoticed by the pilot (a rotational acceleration of 2 degrees per second or below is undetectable by the vestibular system . The pilot may incorrectly perceive that the level flight is not level , and the pilot will lean in the direction of the original turn to regain a ``correct ' vertical posture (``Sensory Illusions in Aviation ' 2006 ) The...











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