Final answer:
A yaw dampener uses a gyroscope to detect and counteract unwanted yaw motions, ensuring smoother and safer flight dynamics.
Step-by-step explanation:
A yaw dampener uses a gyroscope to sense unwanted yaw motions (side-to-side movements of the aircraft's nose) and correct it for smoother flight dynamics. This system is particularly useful in larger aircraft to prevent what is known as a Dutch roll, which is an oscillatory instability that can make the flight uncomfortable or even unsafe. By automatically applying rudder corrections, the yaw dampener maintains stability and improves passenger comfort.