Regional Jet 900 (CRJ900)
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Time Pressure; Workload
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Clearance; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Aircraft Equipment Problem Dissipated; Flight Crew Landed in Emergency Condition; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; General Maintenance Action; General Flight Cancelled / Delayed
Aircraft
While on vectors and at 5;000 feet on the ZZZZZ4 Arrival into ZZZ; the flight deck began to fill with smoke. The Captain (Pilot Monitoring) immediately donned the oxygen mask. I (Pilot Flying) immediately turned the re-circulation fan off. This action seemed to prevent the smoke from getting worse. Once the Captain had his oxygen mask on; he notified ATC and reported to ATC that there was smoke in the cockpit. ATC began to give us vectors to Runway XX at ZZZ. At this point the smoke had begun to dissipate and we concluded there was no fire and the re-circulation fan was likely the cause of the smoke. We continued to land. On the ground the emergency vehicles reported no apparent fire or damage from the outside. The smoke had stopped filling the flight deck and had almost completely dissipated so we elected to taxi back to the gate.
Air Carrier First Officer reported a smoke event on the flight deck during approach. Captain requested expedited handling and executed a safe landing.