Date: 201906
Local time of day: 1801-2400
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: EMB ERJ 135 ER/LR
Operator: Air Carrier
Flight plan: IFR
Mission: Passenger
Flight phase: Climb
Airspace: Class A ZZZ
ATC / advisory: Center ZZZ
Reporter organization: Air Carrier
Reporter function: Pilot Flying; First Officer
Reporter qualification: Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Human factors: Situational Awareness
Second reporter function: Pilot Not Flying; Captain
Anomaly: Aircraft Equipment Problem Critical
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Landed in Emergency Condition
Contributing factors: Aircraft; Human Factors
Primary problem: Aircraft

Narrative: On ZZZ to ZZZ1 our aircraft had a roll trim failure/runaway while in the initial climb out on departure. I was the pilot flying and noticed a problem during a turn on the departure procedure climbing past 20;000 feet. I was complying with all ATC instructions at the time of event. During a normal turn on the departure the aircraft turned abnormal on autopilot. I noticed it immediately and advised my Captain of the problem; along with taking control of the aircraft. We then received EICAS red warning messages of a ROLL TRIM FAILURE. My Captain took control of the aircraft and became the pilot flying; while I grabbed the QRH and proceeded with applying the emergency checklist related to the specific messages. I radioed Approach Control and advised them of the problem and that we were to return to ZZZ. My Captain had me load the proper radio and NAV frequencies; speeds; and approach to land back into ZZZ. Control radar vectored us back to ZZZ on the ILS XXR approach and we landed the aircraft safely. We taxied back and off loaded the passengers and contacted our company. We were able to follow all instructions during the event with no further issues. We followed all QRH procedures; followed CRM procedures; and complied with radio instructions. No one was injured during the event and the aircraft landed safely in ZZZ.


Second narrative: I was PNF on ZZZ; we were climbing on the [SID] and passing FL200 the plane started banking right to the point where it was banking more than usual and said I have flight controls; the AP disconnected right after that then I noticed the ailerons were all the way to the right so then I proceeded to do the memory item for the AILERON HARD OVER/ROLL TRIM RUNAWAY; I said again I have flight controls and the radios the FO proceed to do the QRH emergency items. After doing the memory item and confirming the issue with the QRH we were able to trim the plane. We requested with [TRACON] a return to ZZZ; they gave us vectors. I talked to the FA [Flight Attendant] I asked her if she was ok; then told her we were gonna do a return due flight controls that I'll talk to the passengers when I were less busy; she offered to tell them that we were gonna return; I said ok and please take your seat. I was hand flying I told my FO to do the descent and approach checklist and help me set the landing speeds and configure the FMSs for the ILS in ZZZ and set the frequencies. I found time after everything was set; so I talked to the passengers told them; that we were gonna return to ZZZ due some failures in the front and that we had the situation under control. We were vectored all the way down and we landed safely. We told ground that we didn't need assistance; firetrucks came over when we parked; the asked me what was the issue and if I dumped any fuel or liquids. I talked to the passengers after told them we had some issues and then I told them to deplane. We did the memory item; we confirmed the issue; check the EICAS; proceeded with the QRH; we flew first; navigate then communicate the issue with [TRACON]; we were vectored back to the airport. FA was notified; no one got hurt; no assistance on the ground was needed. Followed the procedures and everyone did what they were trained for.


Synopsis: EMB-135 flight crew reported a roll trim failure on initial climbout; and elected to return to departure airport.