PC-12
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 230; Flight Crew Total 2250; Flight Crew Type 1700
Aircraft Equipment Problem Less Severe
Flight Crew Landed As Precaution; Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport
Aircraft
Upon rotation and Captain call for gear up the trim runaway CAS (Crew Alerting System) message and aural warning came on. The captain interrupted the trim and we immediately let UNICOM know we were [in an emergency situation] and coming back to land. When we tried to trim back nose down it stopped the trim from going up but as soon as the trim switch on the yoke was released it continued to trim up. I as the First Officer had to help the Captain land the aircraft due to strong control forces. Landing was uneventful and taxied into the ramp.
[Report narrative contained no additional information.]
PC12 flight crew reported they received a 'Trim Runaway' on the Crew Alerting System during rotation. The trim system continued to trim up.