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Pitch drop-back is the phenomena by which an aircraft which is perturbed in flight path angle from its trim position by a step input exhibits an output which is indicative of a second order system.
A pilot who actuates an elevator input may find that the aircraft then "droops" or "drops back" to a position further toward the start position. The phenomenon is particularly marked in tilt-rotor aircraft. Pitch drop-back may be controlled using a Stability Augmentation System or Stability Control and Augmentation System.
Video Pitch drop-back
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Source of the article : Wikipedia
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