Definition
An automatic flight control system component that senses unwanted yawing motion and applies small, rapid rudder inputs to counteract it, smoothing flight and suppressing Dutch roll oscillations.
Plain English
A device that automatically nudges the rudder to keep the airplane from wagging its tail side to side.
Context Anchor
Seen in aircraft systems descriptions, cockpit switch labels, autopilot-related procedures, and checklists for airplanes equipped with a yaw damper.
Derivation
‘Yaw’ describes the side-to-side rotation of the nose around the vertical axis. ‘Damper’ comes from ‘damp,’ meaning to reduce or absorb a motion or vibration. Together: a device that absorbs unwanted yaw movement.
Why Pilots Care
It reduces pilot workload in turbulence, improves passenger comfort, and prevents loss of control in aircraft prone to Dutch roll.
Analogy
Like an automatic steering corrector on a car that keeps it straight on a bumpy road so the driver does not have to constantly turn the wheel.
Intuition Check
Do not think of a yaw damper as a full autopilot. It does not fly the route for you; it only makes small rudder inputs to reduce unwanted left-right nose movement.
Example Sentence 1
After reaching cruise altitude, the captain engaged the yaw damper to smooth out the ride.
Example Sentence 2
During the systems check, the yaw damper responded correctly to a simulated yaw input from the test equipment.