Regional Jet 900 (CRJ900)
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 14
Aircraft Equipment Problem Less Severe
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem
Aircraft
Took place from ZZZ-ZZZ1. In cruise at FL200 doing 300 KIAS with autopilot engaged; we experienced un-commanded yawing motions while in a right bank. We felt the rudder kick hard to the left 4 or 5 times. Both pilots feet were on the floor. When we looked at the flight controls synoptic page it confirmed the rudder was moving and strangely the rudder limiter on the left side was bouncing back and forth even though we were at a constant airspeed. After the wings rolled level the rudder stopped kicking. This was the only time the event occurred on this leg. I am not sure why the event occurred; a malfunction of some sort.
CRJ-900 Captain reported a temporary 'un-commanded yawing motion' during a right turn which dissipated and did not reoccur for the remainder of flight.