Narrative:

Received a TCASII alert to 'climb, climb now' while being vectored on a left base to runway 21L dtw. Alert was on a king air cpr Y who was being vectored on a right base to the same runway 21L dtw. We had to take evasive action on the king air and told approach control. Approach told us to climb to 5000 ft. Approach turned us to a 180 degree heading -- back toward runway 21L -- and asked if we had the field when we got a second TCASII alert on a DC9, air carrier Z, who as on a right base (overshoot) to runway 21R. I was able to maintain visual separation and visual approach to runway 21L. Tower switched and cleared us to land runway 21C. I was able to listen to part of the voice tape and determined that approach control told us about the king air after evasive action had already commenced and never told us about the other DC9 to the other runway until asked. Just as an observation -- the tapes sounded like 1 controller was handling multiple frequencys.

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Original NASA ASRS Text

Title: FLC OF A DC9 STOPPED DSCNT AND CLBED IN RESPONSE TO A TCASII RA CAUSED BY A KING AIR ON A VISUAL APCH TO THE SAME RWY. SUBSEQUENTLY, AFTER VECTOR BACK TO FINAL BY ATC, THEY RECEIVED A SECOND TCASII WARNING CAUSED BY ANOTHER DC9 ON FINAL TO A PARALLEL RWY. THIS TIME, THE RPTR COULD MAINTAIN VISUAL SEPARATION AND CONTINUE A VISUAL APCH.

Narrative: RECEIVED A TCASII ALERT TO 'CLB, CLB NOW' WHILE BEING VECTORED ON A L BASE TO RWY 21L DTW. ALERT WAS ON A KING AIR CPR Y WHO WAS BEING VECTORED ON A R BASE TO THE SAME RWY 21L DTW. WE HAD TO TAKE EVASIVE ACTION ON THE KING AIR AND TOLD APCH CTL. APCH TOLD US TO CLB TO 5000 FT. APCH TURNED US TO A 180 DEG HDG -- BACK TOWARD RWY 21L -- AND ASKED IF WE HAD THE FIELD WHEN WE GOT A SECOND TCASII ALERT ON A DC9, ACR Z, WHO AS ON A R BASE (OVERSHOOT) TO RWY 21R. I WAS ABLE TO MAINTAIN VISUAL SEPARATION AND VISUAL APCH TO RWY 21L. TWR SWITCHED AND CLRED US TO LAND RWY 21C. I WAS ABLE TO LISTEN TO PART OF THE VOICE TAPE AND DETERMINED THAT APCH CTL TOLD US ABOUT THE KING AIR AFTER EVASIVE ACTION HAD ALREADY COMMENCED AND NEVER TOLD US ABOUT THE OTHER DC9 TO THE OTHER RWY UNTIL ASKED. JUST AS AN OBSERVATION -- THE TAPES SOUNDED LIKE 1 CTLR WAS HANDLING MULTIPLE FREQS.

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.