Narrative:

We were being vectored on a wide right downwind to runway 33L at bwi with potomac approach. Traffic was called and spotted by my first officer, a single engine aircraft that was vectored from left to right 1000 ft below us. After the aircraft passed by, we called the field and we were cleared for the visual to runway 33L. During our turn to final we lost visual contact with the aircraft and informed approach control that we no longer had the aircraft in sight. The controller stated that it was no factor and stated again that we were cleared for the visual runway 33L and gave us a frequency change to bwi tower. As we were switching to the tower frequency I spotted a target on our TCASII coming towards our flight path. The aircraft was converging with our final and I remember our TCASII showing it 200-400 ft below us. We checked in with tower and inquired as to the other aircraft's position and intentions. The tower controller stated that she had been unable to raise the other aircraft. We received a TA followed by an RA with 'monitor vertical speed' and then a 'climb' advisory. I brought full power up on our aircraft and initiated a climbing left turn in response to the RA. My first officer said that when he spotted the aircraft again it was approximately 1/2 to 1/4 mi and closing and approximately 200 ft below our altitude. I spoke with bwi tower and potomac approach once on the ground. I was told that the aircraft in question was a student pilot on solo flight that had been navigating for runway 33R. I have spoken with a number of supervisors at potomac TRACON and have been assured that they will contact me when the tapes have been reviewed. I have yet to hear from them. I think someone should talk to the flight instructor/chief flight instructor of the flight school in question.

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Original NASA ASRS Text

Title: LOSS OF TFC SEPARATION BTWN AN ARR EMB145 AND A STUDENT PLT IN A KATANA MAKING A NORAC APCH TO THE WRONG RWY AT BWI, MD.

Narrative: WE WERE BEING VECTORED ON A WIDE R DOWNWIND TO RWY 33L AT BWI WITH POTOMAC APCH. TFC WAS CALLED AND SPOTTED BY MY FO, A SINGLE ENG ACFT THAT WAS VECTORED FROM L TO R 1000 FT BELOW US. AFTER THE ACFT PASSED BY, WE CALLED THE FIELD AND WE WERE CLRED FOR THE VISUAL TO RWY 33L. DURING OUR TURN TO FINAL WE LOST VISUAL CONTACT WITH THE ACFT AND INFORMED APCH CTL THAT WE NO LONGER HAD THE ACFT IN SIGHT. THE CTLR STATED THAT IT WAS NO FACTOR AND STATED AGAIN THAT WE WERE CLRED FOR THE VISUAL RWY 33L AND GAVE US A FREQ CHANGE TO BWI TWR. AS WE WERE SWITCHING TO THE TWR FREQ I SPOTTED A TARGET ON OUR TCASII COMING TOWARDS OUR FLT PATH. THE ACFT WAS CONVERGING WITH OUR FINAL AND I REMEMBER OUR TCASII SHOWING IT 200-400 FT BELOW US. WE CHKED IN WITH TWR AND INQUIRED AS TO THE OTHER ACFT'S POS AND INTENTIONS. THE TWR CTLR STATED THAT SHE HAD BEEN UNABLE TO RAISE THE OTHER ACFT. WE RECEIVED A TA FOLLOWED BY AN RA WITH 'MONITOR VERT SPD' AND THEN A 'CLB' ADVISORY. I BROUGHT FULL PWR UP ON OUR ACFT AND INITIATED A CLBING L TURN IN RESPONSE TO THE RA. MY FO SAID THAT WHEN HE SPOTTED THE ACFT AGAIN IT WAS APPROX 1/2 TO 1/4 MI AND CLOSING AND APPROX 200 FT BELOW OUR ALT. I SPOKE WITH BWI TWR AND POTOMAC APCH ONCE ON THE GND. I WAS TOLD THAT THE ACFT IN QUESTION WAS A STUDENT PLT ON SOLO FLT THAT HAD BEEN NAVING FOR RWY 33R. I HAVE SPOKEN WITH A NUMBER OF SUPVRS AT POTOMAC TRACON AND HAVE BEEN ASSURED THAT THEY WILL CONTACT ME WHEN THE TAPES HAVE BEEN REVIEWED. I HAVE YET TO HEAR FROM THEM. I THINK SOMEONE SHOULD TALK TO THE FLT INSTRUCTOR/CHIEF FLT INSTRUCTOR OF THE FLT SCHOOL IN QUESTION.

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.