What device is commonly used to counteract Dutch roll in modern aircraft?

Yaw dampers are commonly used in modern aircraft to counteract Dutch roll, a specific type of oscillatory motion characterized by the aircraft rolling along its longitudinal axis while simultaneously yawing about its vertical axis. This phenomenon can lead to discomfort for passengers and potential control issues if not managed effectively.

Yaw dampers work by automatically adjusting the rudder's position in response to the aircraft's movements. They detect yaw rate and apply corrective inputs to stabilize the aircraft, effectively dampening the oscillations. This system significantly enhances directional stability, providing smoother and more controlled flight.

The other devices listed, while important for various aspects of flight control, do not specifically address the unique challenges posed by Dutch roll. Ailerons primarily control roll, elevators manage pitch, and rudder trim tabs are used for fine-tuning yaw control but do not actively dampen oscillations like yaw dampers do. Thus, yaw dampers are essential for maintaining stability and safety in aircraft experiencing Dutch roll.