PC-12
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
After an uneventful departure from ZZZ runway XX we followed the departure instructions and were told to contact approach. Once in contact with approach for approximately 1 minute we received an audio and visual message indicating 'trim in motion'. FO (First Officer) in the right seat was flying; and I reached down to engage the trim interrupt button. The audio and visual messages went away as I was hovering over the button; so FO attempted to manually re-trim. The trim motor didn't seem to move on his command; and about 5 seconds later it continued to trim nose up. After initial indications that it was trimming up again I engaged the trim interrupt; and ran the QRH as FO kept positive control of the aircraft. The trim was about halfway up on the indicator; and FO indicated  he was not having issue in controlling the aircraft. The QRH led us to disable the main trim motor; and we were able to use the alternate stab trim. After completion of the QRH vectors back to landing was uneventful. We advised ATC of the issue about 1 minute after it occurred; and there was no delay in them vectoring us back to ZZZ.
Captain reported a stabilizer main trim runaway on take off and were able to disconnect and use alternate trim to control the aircraft. Captain elected to perform an air turn back and precautionary landing.