Narrative:

Air carrier X approaching klex from the sse, on a vectored descent direct to klex, anticipating clearance for an ILS runway 22 approach. Visibility was good, VMC night conditions. Lex approach asked us if we had traffic in sight at our 1 O'clock position over the city. We checked our TCASII presentation. Traffic was confirmed in that direction and we both saw an aircraft Y light over the city. We responded 'affirmative' and the approach controller said to maintain visual separation from the aircraft Y. The approach controller then asked if we had the airport in sight at our 11 O'clock position. When we replied 'affirmative,' he cleared us for the visual approach to runway 22 and to keep traffic in sight. I began slowing the aircraft, configuring for approach, then turned right to 040 degrees (left downwind) and began descent to OM fix altitude. After beginning left turn to base leg (heading approximately 020 degrees) approach controller advised us to start our turn to base leg. We said we were already turning base. As our heading passed approximately 360 degrees we got TCASII TA/RA on traffic at our 2 O'clock position. TCASII directed us to descend. Captain saw traffic in that direction and pointed it out. I also saw the traffic about 1 - 1 1/2 mi as I started making TCASII correction to specified descent rate. I said the aircraft would pass off our right side, behind us and be no factor. Before reaching TCASII descent rate and in a continuing left turn to base (approximately 310 degree heading) we received a second TCASII TA/RA. A new aircraft 'popped up' at our 11 O'clock position, approximately 300 ft below us. TCASII commanded a climb, then level off which I complied with. Both of us then spotted the aircraft Y approximately 300 ft below and 1000-1500 ft horizontal, passing off left side of aircraft. The aircraft appeared to be in a turn to the south. Captain called approach controller with near midair collision report and controller said that traffic was what we were initially directed to remain clear of. We were then turning onto final approach at approximately 4 1/2 mi on GS and told to switch to tower.

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Original NASA ASRS Text

Title: ACR X TCASII TA/RA WITH ACFT Y. ACR X ON VISUAL APCH FAILED TO KEEP ACFT Y IN SIGHT.

Narrative: ACR X APCHING KLEX FROM THE SSE, ON A VECTORED DSCNT DIRECT TO KLEX, ANTICIPATING CLRNC FOR AN ILS RWY 22 APCH. VISIBILITY WAS GOOD, VMC NIGHT CONDITIONS. LEX APCH ASKED US IF WE HAD TFC IN SIGHT AT OUR 1 O'CLOCK POS OVER THE CITY. WE CHKED OUR TCASII PRESENTATION. TFC WAS CONFIRMED IN THAT DIRECTION AND WE BOTH SAW AN ACFT Y LIGHT OVER THE CITY. WE RESPONDED 'AFFIRMATIVE' AND THE APCH CTLR SAID TO MAINTAIN VISUAL SEPARATION FROM THE ACFT Y. THE APCH CTLR THEN ASKED IF WE HAD THE ARPT IN SIGHT AT OUR 11 O'CLOCK POS. WHEN WE REPLIED 'AFFIRMATIVE,' HE CLRED US FOR THE VISUAL APCH TO RWY 22 AND TO KEEP TFC IN SIGHT. I BEGAN SLOWING THE ACFT, CONFIGURING FOR APCH, THEN TURNED R TO 040 DEGS (L DOWNWIND) AND BEGAN DSCNT TO OM FIX ALT. AFTER BEGINNING L TURN TO BASE LEG (HDG APPROX 020 DEGS) APCH CTLR ADVISED US TO START OUR TURN TO BASE LEG. WE SAID WE WERE ALREADY TURNING BASE. AS OUR HDG PASSED APPROX 360 DEGS WE GOT TCASII TA/RA ON TFC AT OUR 2 O'CLOCK POS. TCASII DIRECTED US TO DSND. CAPT SAW TFC IN THAT DIRECTION AND POINTED IT OUT. I ALSO SAW THE TFC ABOUT 1 - 1 1/2 MI AS I STARTED MAKING TCASII CORRECTION TO SPECIFIED DSCNT RATE. I SAID THE ACFT WOULD PASS OFF OUR R SIDE, BEHIND US AND BE NO FACTOR. BEFORE REACHING TCASII DSCNT RATE AND IN A CONTINUING L TURN TO BASE (APPROX 310 DEG HDG) WE RECEIVED A SECOND TCASII TA/RA. A NEW ACFT 'POPPED UP' AT OUR 11 O'CLOCK POS, APPROX 300 FT BELOW US. TCASII COMMANDED A CLB, THEN LEVEL OFF WHICH I COMPLIED WITH. BOTH OF US THEN SPOTTED THE ACFT Y APPROX 300 FT BELOW AND 1000-1500 FT HORIZ, PASSING OFF L SIDE OF ACFT. THE ACFT APPEARED TO BE IN A TURN TO THE S. CAPT CALLED APCH CTLR WITH NMAC RPT AND CTLR SAID THAT TFC WAS WHAT WE WERE INITIALLY DIRECTED TO REMAIN CLR OF. WE WERE THEN TURNING ONTO FINAL APCH AT APPROX 4 1/2 MI ON GS AND TOLD TO SWITCH TO TWR.

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.