How does a yaw damper function in aircraft with swept wings?

The yaw damper plays a crucial role in enhancing the stability and control of an aircraft, particularly those with swept wings, by addressing phenomena known as Dutch roll oscillations. Swept-wing aircraft are susceptible to these oscillations, which are characterized by a combination of yawing and rolling motions that can destabilize the aircraft.

By utilizing sensors that detect yaw movement, the yaw damper automatically adjusts the rudder's position to counteract any unwanted yawing motion. This automatic correction helps maintain a steady flight path, allowing the aircraft to fly more smoothly and efficiently. The yaw damper ensures that any disturbances in yaw are promptly managed, thus preventing the pilot from needing to make constant corrections, which can be both tiring and imprecise.

This function is particularly significant when operating in various flight phases, as it contributes to overall aircraft safety and comfort for passengers. It does not directly improve fuel efficiency, stabilize ascent, or enhance engine performance, making its primary role clearly focused on mitigating Dutch roll oscillations to maintain stable flight.