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Pilot Induced Roll Oscillation
Pilot Induced Oscillations (PIO) are inadvertent, sustained oscillations of the airplane resulting from interactions between the aircraft and control inputs by the pilot. They are often associated with tasks where the pilot is attempting to precisely and quickly accomplish a flight maneuver (such as the final phase of landing). In a fully developed lateral PIO, pilot control wheel inputs will be out of phase with the airplane roll response.
Flight crews should be aware of the potential for pilot induced roll oscillations when using high rate, high magnitude, rapidly reversed control wheel inputs. This potential is increased when in landing configuration with gusty wind conditions. Pilot techniques that utilize abrupt and pulsing control inputs may also contribute to these events.
The following action should be accomplished immediately when either pilot recognizes that a PIO exists:
Pilot Flying / Pilot Monitoring:
- Announce the situation
Pilot Flying:
- Immediately stop lateral control wheel inputs until the airplane stabilizes
- Initiate go-around if oscillations do not diminish or if the aircraft is not in a
position from which a safe landing can be made
Pilot Monitoring:
- Verify appropriate pilot response
- Recommend go-around if airplane is not stabilized for landing |
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