EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Aircraft Equipment Problem Dissipated; Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Declared Emergency
Aircraft
On takeoff the aircraft yawed abruptly to the right; the First Officer was flying and was able to control the aircraft with rudder pressure; but it was hard for him to maintain a steady heading; so we declared an emergency and were and asked for immediate return. While on downwind vectors we regained yaw trim and landed normally.
During takeoff at about 500 FT the airplane yawed hard to the right and I applied left rudder to get the airplane under control. We saw the yaw trim went all the way full right and would not come back to the center position. We declared an emergency and requested an immediate return for landing. As we were getting vectors the Captain was looking for the checklist and during that time we tried the yaw trim one more time and it worked and we were able to center it normally and we landed.
EMB-145 flight crew experiences runaway rudder trim shortly after takeoff. Initially the full right rudder trim cannot be removed and an emergency is declared for immediate return. On downwind the trim becomes operable and is centered for landing.