B737-900
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Communication Breakdown
Aircraft Equipment Problem Less Severe
General Maintenance Action
Aircraft
On short final below 500 ft. the FO (First Officer) was flying and had an un-commanded stabilizer trim down. He stopped it with using the electric trim in the opposite direction correcting the out of trim condition and landed uneventfully. After landing we debriefed what happened and decided to write the malfunction up in the aircraft log. I was unaware that the FO was experiencing a problem with the trim until after landing.
B737NG flight crew reported stabilizer trim anomalies on final.