B737-700
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 180; Flight Crew Type 3300
Aircraft Equipment Problem Critical; Inflight Event / Encounter Loss Of Aircraft Control
Air Traffic Control Provided Assistance; Flight Crew Took Evasive Action; Flight Crew Returned To Departure Airport; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Regained Aircraft Control; Flight Crew Overcame Equipment Problem; Flight Crew Landed As Precaution; General Maintenance Action; General Flight Cancelled / Delayed
Aircraft
I was Pilot Flying. Just after liftoff; the nose trim ran high speed nose up on its own. I waited a quick moment and told the Captain that I was not doing that trim command; and then pushed forward on the yoke to stop the runaway. After retracting the flaps; I relaxed forward pressure and the trim continued nose up runaway at slow speed. I pressed the electric time nose down on the yoke; and the up trim stopped its uncommanded nose up runaway. Then we ran the Stabilizer Runaway Checklist and returned back to ZZZ uneventfully.
During takeoff from ZZZ; at approximately 300 ft. AGL; the aircraft trim began running continuously; high-speed; in the 'Nose-Up' direction. The F/O (First Officer) stopped the trim by pushing forward on the yoke. This action stopped the trim movement. At 1;200 ft. AGL; after retracting the flaps; the trim began running again; continuously 'Nose-Up' in the slow-speed mode. This time the F/O used the Electrical Trim switch in the opposite direction and this action stopped the movement. We ran the Runaway Stabilizer Checklist and returned to ZZZ for an uneventful approach and landing.
Pilot reported a runaway stabilizer trim system and elected to air turn back and make a precautionary emergency landing.