
1) Aircraft control
Found on
https://www.crosswordclues.com/clue/yaw-damper

A yaw damper is a device used on many aircraft (usually jets and turboprops) to damp (reduce) the rolling and yawing oscillations due to Dutch roll mode. It involves yaw rate sensors and a processor that provides a signal to an actuator connected to the rudder. The use of the yaw damper helps to provide a better ride for passengers, and on some ai...
Found on
http://en.wikipedia.org/wiki/Yaw_damper
[railroad] A yaw damper is a transverse mounted shock absorber used to prevent railcars and locomotives from swaying excessively from side to side. Yaw dampers prevent locomotives and passenger railcars from striking station platforms as they roll past them and reduce the gap that must be left between the railroad vehicle and the platform. ...
Found on
http://en.wikipedia.org/wiki/Yaw_damper_(railroad)

a shock absorber fitted to certain types of bogies to control their rotation at high speeds
Found on
http://www.scot-rail.co.uk/page/Glossary
No exact match found.