While being vectored for arrival at iad; flight crew received an RA and responded accordingly.

Attributes
ACN	1309895
Time
Date	201511
Local Time Of Day	1201-1800
Place
Locale Reference	IAD.Airport
State Reference	DC
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Medium Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	Climb
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 180 Flight Crew Total 5692 Flight Crew Type 1003
Events
Anomaly	Conflict NMAC Deviation - Altitude Excursion From Assigned Altitude
Miss Distance	Vertical 500

Narrative:

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 runway 19C to a landing.

Original NASA ASRS Text

Title: While being vectored for arrival at IAD; flight crew received an RA and responded accordingly.

Narrative: 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.

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.