Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Time Pressure; Troubleshooting
Aircraft Equipment Problem Less Severe
Flight Crew FLC Overrode Automation; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action; Flight Crew Landed in Emergency Condition; General Maintenance Action
Aircraft
While in cruise flight at FL350; we started a descent to FL330; I deployed the flight spoilers. Immediately after deploying the flight spoilers; we experienced an uncommanded and abrupt left turn.  I disconnected the autopilot and stowed the flight spoilers. Two EICAS cautions messages presented; OB SPOILERONS and FLT SPOILERS.  We ran the QRH checklist and no further action was required.  We were concerned that we may get another uncommanded left roll during the approach and landing; we [advised ATC] and asked for the ARFF (Aircraft Rescue Firefighting) to meet us at the runway.We landed without incident.
A CRJ-900 Captain reported an uncommanded left turn when he deployed the flight spoilers.