Narrative:

During climb approximately 3000 feet AGL; 250 knots; I input some rudder trim; as the slip/skid indication on the primary flight display was not perfectly centered; this is normal operations for the crj. Shortly after that; I noticed the slip skid indicator all the way off to the left and the nose yawed approximately 3 degrees to the right. My first officer stated; 'look at your rudder trim' or something like that. The rudder trim indication was fully deflected to the right. I re-centered the rudder trim and we continued the flight uneventfully.rudder trim knobs with weak centering springs and wide dead bands in the middle is a known issue on the crj. However; this is the first time in three years of flying the crj that the knob has not returned properly to center. I have had runaway rudder trim happen to me in the simulator; and in both the simulator and the aircraft; I physically re-centered the knob after I add rudder trim before letting go of the knob to (presumably) stop rudder trim movement just to be sure.this event in of itself could be considered an outlier. However; if rudder trim runaway becomes a regular safety report; we should take action to either advise pilots of this as a safety issue and/or consider replacing rudder trim control units; preemptively if required. During normal flight; rudder trim position is not part of my normal scan. I personally will be more careful to watch the rudder trim position after rudder trim input in the future.

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Original NASA ASRS Text

Title: CRJ-200 Captain reported that after a small amount of rudder trim input; the trim system continued until reaching full scale.

Narrative: During climb approximately 3000 feet AGL; 250 knots; I input some rudder trim; as the slip/skid indication on the Primary Flight Display was not perfectly centered; this is normal operations for the CRJ. Shortly after that; I noticed the slip skid indicator all the way off to the left and the nose yawed approximately 3 degrees to the right. My First Officer stated; 'Look at your rudder trim' or something like that. The rudder trim indication was fully deflected to the right. I re-centered the rudder trim and we continued the flight uneventfully.Rudder trim knobs with weak centering springs and wide dead bands in the middle is a known issue on the CRJ. However; this is the first time in three years of flying the CRJ that the knob has not returned properly to center. I have had runaway rudder trim happen to me in the simulator; and in both the simulator and the aircraft; I physically re-centered the knob after I add rudder trim before letting go of the knob to (presumably) stop rudder trim movement just to be sure.This event in of itself could be considered an outlier. However; if rudder trim runaway becomes a regular safety report; we should take action to either advise pilots of this as a safety issue and/or consider replacing rudder trim control units; preemptively if required. During normal flight; rudder trim position is not part of my normal scan. I personally will be more careful to watch the rudder trim position after rudder trim input in the future.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.