Narrative:

Air carrier X on downwind runway 35R at okc level at 6000 ft MSL, ATC issued a climb clearance to a departing cpr aircraft Y to climb through our altitude based on aircraft Y maintaining visual separation with us. Aircraft Y said he had us in sight and would comply. ATC then advised us of the clearance for the airplane. As I was leaning to look down for the traffic, a RA first to 'monitor vertical speed' immediately followed by a 'climb, climb' and immediately by a 'descend, descend' occurred. The first officer was flying and was understandably uncertain what to do. I looked out and saw a falcon 50 cpr Y (I could read the number) in a steep climb coming from right to left on a collision course. The time involved up to this point approximately 30 seconds total and 6 seconds from the initial RA. I took evasive action by turning right and descending, missing the falcon's tail by about 300 ft horizontal. We flew through his wake about 3 seconds after he passed. Roll and pitch rates were not excessive but were deliberate. As the maneuver began, I keyed the yoke microphone and advised ATC that we were taking evasive action and had an RA. I called ATC at okc TRACON upon arrival at their request and was informed that they would be filing a report. Supplemental information from acn 315435: air carrier X B737 was approximately 10 mi northeast of the okc airport, heading 180 degrees, assigned 6000 ft MSL. X was being vectored for a visual approach to runway 35R. Cpr Y DA20 had departed okc runway 35R assigned heading 010 degrees and 5000 ft MSL. I was working both arrs and departures in that airspace. I assigned Y heading 080 degrees and maintain 5000 ft MSL to ensure separation between Y at 5000 ft MSL and X at 6000 ft MSL. I next exchanged traffic position with both aircraft. Y advised 'traffic in sight.' I then instructed Y to 'maintain visual separation and climb and maintain 15000 ft.' X next reported a TCASII RA to climb. The pilot of aircraft X next stated that he was declaring a 'near miss and file the paperwork.' I then switched X to the final controller frequency. I advised the pilot of aircraft Y of the incident and then switched the aircraft to the ARTCC frequency. I do not know if X actually initiated a climb in conformance with the TCASII advisory, but if so, this could have confused Y as to what X was going to do. Thereby making visual separation more difficult.

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Original NASA ASRS Text

Title: ACR X TCASII RA. HAD NMAC WITH CPR ACFT Y. VISUAL SEPARATION IN USE, SEE AND AVOID CONCEPT.

Narrative: ACR X ON DOWNWIND RWY 35R AT OKC LEVEL AT 6000 FT MSL, ATC ISSUED A CLB CLRNC TO A DEPARTING CPR ACFT Y TO CLB THROUGH OUR ALT BASED ON ACFT Y MAINTAINING VISUAL SEPARATION WITH US. ACFT Y SAID HE HAD US IN SIGHT AND WOULD COMPLY. ATC THEN ADVISED US OF THE CLRNC FOR THE AIRPLANE. AS I WAS LEANING TO LOOK DOWN FOR THE TFC, A RA FIRST TO 'MONITOR VERT SPD' IMMEDIATELY FOLLOWED BY A 'CLB, CLB' AND IMMEDIATELY BY A 'DSND, DSND' OCCURRED. THE FO WAS FLYING AND WAS UNDERSTANDABLY UNCERTAIN WHAT TO DO. I LOOKED OUT AND SAW A FALCON 50 CPR Y (I COULD READ THE NUMBER) IN A STEEP CLB COMING FROM R TO L ON A COLLISION COURSE. THE TIME INVOLVED UP TO THIS POINT APPROX 30 SECONDS TOTAL AND 6 SECONDS FROM THE INITIAL RA. I TOOK EVASIVE ACTION BY TURNING R AND DSNDING, MISSING THE FALCON'S TAIL BY ABOUT 300 FT HORIZ. WE FLEW THROUGH HIS WAKE ABOUT 3 SECONDS AFTER HE PASSED. ROLL AND PITCH RATES WERE NOT EXCESSIVE BUT WERE DELIBERATE. AS THE MANEUVER BEGAN, I KEYED THE YOKE MIKE AND ADVISED ATC THAT WE WERE TAKING EVASIVE ACTION AND HAD AN RA. I CALLED ATC AT OKC TRACON UPON ARR AT THEIR REQUEST AND WAS INFORMED THAT THEY WOULD BE FILING A RPT. SUPPLEMENTAL INFO FROM ACN 315435: ACR X B737 WAS APPROX 10 MI NE OF THE OKC ARPT, HDG 180 DEGS, ASSIGNED 6000 FT MSL. X WAS BEING VECTORED FOR A VISUAL APCH TO RWY 35R. CPR Y DA20 HAD DEPARTED OKC RWY 35R ASSIGNED HDG 010 DEGS AND 5000 FT MSL. I WAS WORKING BOTH ARRS AND DEPS IN THAT AIRSPACE. I ASSIGNED Y HDG 080 DEGS AND MAINTAIN 5000 FT MSL TO ENSURE SEPARATION BTWN Y AT 5000 FT MSL AND X AT 6000 FT MSL. I NEXT EXCHANGED TFC POS WITH BOTH ACFT. Y ADVISED 'TFC IN SIGHT.' I THEN INSTRUCTED Y TO 'MAINTAIN VISUAL SEPARATION AND CLB AND MAINTAIN 15000 FT.' X NEXT RPTED A TCASII RA TO CLB. THE PLT OF ACFT X NEXT STATED THAT HE WAS DECLARING A 'NEAR MISS AND FILE THE PAPERWORK.' I THEN SWITCHED X TO THE FINAL CTLR FREQ. I ADVISED THE PLT OF ACFT Y OF THE INCIDENT AND THEN SWITCHED THE ACFT TO THE ARTCC FREQ. I DO NOT KNOW IF X ACTUALLY INITIATED A CLB IN CONFORMANCE WITH THE TCASII ADVISORY, BUT IF SO, THIS COULD HAVE CONFUSED Y AS TO WHAT X WAS GOING TO DO. THEREBY MAKING VISUAL SEPARATION MORE DIFFICULT.

Data retrieved from NASA's ASRS site as of July 2007 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.