On May 23, the plane underwent scheduled maintenance, and afterward pilots noticed the rudder pedals moving when the yaw damper was engaged. Pilots on the May 25 flight felt the pedals moving ...

The cradle was also connected to the rudder, which controlled the plane's "yaw" (rotation around a vertical axis). This lever, operated by the pilot's left hand, was connected by a pulley system ...

The vertical stabilizer is equipped with a movable rudder, which gives the pilots yaw control - the ability to turn the airplane left and right. Some vertical stabilizers are also fitted with trim ...