Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 180; Flight Crew Total 5692; Flight Crew Type 1003
Situational Awareness
Conflict NMAC; Deviation - Altitude Excursion From Assigned Altitude
Flight Crew Took Evasive Action
Human Factors
While on Autopilot and being vectored by ATC (Potomac Approach) in VFR conditions level 7;000 ft; ATC pointed out VFR traffic across the river 1;000 ft below our altitude. We had the traffic on TCAS; but no visual contact. The VFR traffic began a climb at our 12 o'clock position; ATC then issued a 20 degree turn left of course; as we were complying with the instructions; the VFR traffic rapidly climbed to within 500 ft. This resulted in a TCAS RA 'CLIMB CLIMB.' We performed the traffic collision avoidance maneuver. TCAS 'CLEAR OF CONFLICT' occurred at 7;350 ft. ATC was notified of the RA climb. Reconfigured and continued with ATC vectoring to RWY 19C to a landing.
While being vectored for arrival at IAD; flight crew received an RA and responded accordingly.