Date: 202103
Local time of day: 1201-1800
Location: ZZZ.ARTCC, US
Aircraft: EMB ERJ 170/175 ER/LR
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Climb
Airspace: Class E ZZZ
ATC / advisory: Center ZZZ
Aircraft component: Autopilot
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Human factors: Human-Machine Interface; Situational Awareness; Time Pressure; Workload; Confusion
Second reporter function: Pilot Flying; Captain
Anomaly: Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Loss Of Aircraft Control
Detector: Person Flight Crew; Person Air Traffic Control
When detected: In-flight
Result: Air Traffic Control Issued Advisory / Alert; Flight Crew Took Evasive Action; Flight Crew Overrode Automation; Flight Crew Regained Aircraft Control; Flight Crew Overcame Equipment Problem
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: I was PM (Pilot Monitoring) on our flight to ZZZ. We departed the runway and flew the ZZZZZ departure. All was well through 10;000 feet and shortly thereafter; the A/P was coupled. We were VMC and it was a normal; 270 knot climb. Approximately 8 miles before ZZZZZ; maybe climbing through 14;000 feet; the aircraft began an uncommanded; soft turn to the right of course. It then increased to a more abrupt banking turn to the right; accompanied with about 4-5 degrees of nose-down pitch attitude. The turn to the right was approximately 40-50 degrees total. The airspeed quickly increased and I saw airspeed tape up to; but not into; the barber pole. I don't recall any aural warning and the EICAS was clear. This evolution was quick. The CA (Captain) and I exchanged a few words as he detected the error; followed by an A/P disconnect and a manual recovery; which began with a pitch input and throttle adjustment. I was talking to Center as this began and was queried immediately. I replied that we experienced a perceived autopilot anomaly; but were correcting. We were instructed to rejoin the departure at ZZZZZ and continue from there. The CA and I discussed the event; and once back on profile; we re-engaged A/P and continued the flight in normal fashion.I'm still not sure what happened. The DP (Departure Procedure) was loaded directly from the FMS data base; with no modifications. We were climbing VIA; in magenta FLCH. When the aircraft began to stray; the A/P was following the flight director cue the whole time. The pitch down was concerning and both of us suspected a trim runaway at first; but as the yoke was pushing forward from the A/P; the CA quickly de-coupled the A/P and recovered back on course. Looking back; we performed normally and programmed the FMS normally. I have no explanation for this event; but I am grateful we were VMC at the time and that we recovered in a timely manner. The CA did further consulting once we landed in ZZZ.


Second narrative: I was PF (Pilot Flying). We departed the runway and flew the ZZZZZ departure. All was well through 10;000 feet and shortly thereafter; the A/P was coupled. We were VMC and it was a normal climb. Approximately 8 miles before ZZZZZ; maybe climbing through 14;000 feet; the aircraft began an uncommanded; soft turn to the right off course. It then increased to a more abrupt banking turn to the right; the airspeed quickly increased and I saw airspeed tape up to; but not into; the barber pole. I don't recall any aural warning and the EICAS was clear. This evolution was quick. The FO (First Officer) and I exchanged a few words I disconnect the auto pilot and a manual recovery; which began with a pitch input and throttle adjustment. FO was talking to Center as this began and was queried immediately. He replied we experienced an anomaly; but were correcting. We were instructed to rejoin the departure at ZZZZZ and continue from there. Hand flew for a few minutes once back on course; we re-engaged A/P and continued the flight; which was uneventful.


Synopsis: EMB-175 flight crew reported an autopilot anomaly resulting in a momentary loss of aircraft control.