Narrative:

Stab trim runaway at 8500 feet. First officer (first officer) was flying; autopilot on; aircraft configuration was clean and we were steady state at 240-250 knots.I heard the 'stab in motion' aural go off for what I perceived as too long for normal operations; especially with the aircraft configuration.I assumed control of the aircraft and disconnected the stab trim. I perceived a nose down (yoke moving fwd) motion just prior to disconnecting the trim. I called for the memory items for stab trim runaway; and the QRH.the first officer accomplished the required checklists. I had the aircraft and the radios. We [advised ATC]; requested an immediate return to [departure airport] and a descent. I was fighting a nose down trim condition which seemed best at around 230 knots. We got vectored for an approach and requested a long final. Somewhere in there the first officer got the landing data and we determined we had sufficient runway available (155%). As the flaps came out; the nose down trim feel abated for the most part. We were fast at 1000 feet but I was able to get to ref 20 flaps plus a few by 500 feet. Uneventful landing ensued. WX was low ceilings; 3NM vis in mod rain; wind 90 degrees left wind; wet runway.we missed the thrust reversers. Probably did not run the landing checklist with all that was going on. When I pulled them on landing; I got the caution msgs; closed the reversers; armed the switches and then redeployed them without further incident. Still stopped with plenty of runway remaining.

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Original NASA ASRS Text

Title: CRJ-200 Captain reported returning to departure airport after experiencing a stabilizer trim problem.

Narrative: Stab trim runaway at 8500 feet. First Officer (FO) was flying; autopilot on; aircraft configuration was clean and we were steady state at 240-250 knots.I heard the 'stab in motion' aural go off for what I perceived as too long for normal operations; especially with the aircraft configuration.I assumed control of the aircraft and disconnected the stab trim. I perceived a nose down (yoke moving fwd) motion just prior to disconnecting the trim. I called for the memory items for stab trim runaway; and the QRH.The FO accomplished the required checklists. I had the aircraft and the radios. We [advised ATC]; requested an immediate return to [departure airport] and a descent. I was fighting a nose down trim condition which seemed best at around 230 knots. We got vectored for an approach and requested a long final. Somewhere in there the FO got the landing data and we determined we had sufficient runway available (155%). As the flaps came out; the nose down trim feel abated for the most part. We were fast at 1000 feet but I was able to get to ref 20 flaps plus a few by 500 feet. Uneventful landing ensued. WX was low ceilings; 3NM vis in mod rain; wind 90 degrees left wind; wet runway.We missed the thrust reversers. Probably did not run the landing checklist with all that was going on. When I pulled them on landing; I got the caution msgs; closed the reversers; armed the switches and then redeployed them without further incident. Still stopped with plenty of runway remaining.

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.