A crj-900 captain reported an uncommanded left turn when he deployed the flight spoilers.

Attributes
ACN	1456020
Time
Date	201706
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 900 (CRJ900)
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Speedbrake/Spoiler
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

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 flight 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.

Original NASA ASRS Text

Title: A CRJ-900 Captain reported an uncommanded left turn when he deployed the flight spoilers.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.