Yaw damper
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A yaw damper is a device used on many aircraft (usually jets and turboprops) to damp (reduce) the rolling and yawing oscillations due to Dutch roll mode<ref>http://www.boeing-727.com/Data/systems/infoyawdampers.html</ref>. It involves yaw rate sensors and a processor that provides a signal to an actuator connected to the rudder. The use of the yaw damper helps to provide a better ride for passengers, and on some aircraft is a required piece of equipment to ensure that the aircraft stability remains within certification values.
The term is often mis-pronounced as a "yaw dampener".
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