Narrative:

During an approach to rsw on assigned heading of 160 degrees, descending to assigned altitude of 3000 ft, approach control called traffic at 11 O'clock unknown altitude -- and 12 O'clock 2700 ft climbing 1 mi. 2 yellow circle symbols appeared on our TCASII scope at about the same time. We stopped our descent leveling off at 3000 ft. The unknown altitude traffic dropped off the scope. The other traffic indicated minus 03 climbing then rapidly went to a yellow symbol minus 02 then red minus 01 climbing. The TCASII gave us then an RA of 'climb, crossing, climb' as the red square went to minus 01 climbing. We immediately climbed. Just as we climbed, the target passed beneath the aircraft symbol. We recovered to normal attitude after clear of conflict. We felt collision was imminent. Elapsed time from ATC advisory to recovery was approximately 15 seconds.

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Original NASA ASRS Text

Title: NMAC -- EVASIVE ACTION CLB -- ACR IS TOLD OF TFC IN ITS AREA AND LATER THAT TFC TRIGGERS AN 'RA' AS IT CLBS WITHIN ABOUT 100 FT OF THE ACR.

Narrative: DURING AN APCH TO RSW ON ASSIGNED HDG OF 160 DEGS, DSNDING TO ASSIGNED ALT OF 3000 FT, APCH CTL CALLED TFC AT 11 O'CLOCK UNKNOWN ALT -- AND 12 O'CLOCK 2700 FT CLBING 1 MI. 2 YELLOW CIRCLE SYMBOLS APPEARED ON OUR TCASII SCOPE AT ABOUT THE SAME TIME. WE STOPPED OUR DSCNT LEVELING OFF AT 3000 FT. THE UNKNOWN ALT TFC DROPPED OFF THE SCOPE. THE OTHER TFC INDICATED MINUS 03 CLBING THEN RAPIDLY WENT TO A YELLOW SYMBOL MINUS 02 THEN RED MINUS 01 CLBING. THE TCASII GAVE US THEN AN RA OF 'CLB, XING, CLB' AS THE RED SQUARE WENT TO MINUS 01 CLBING. WE IMMEDIATELY CLBED. JUST AS WE CLBED, THE TARGET PASSED BENEATH THE ACFT SYMBOL. WE RECOVERED TO NORMAL ATTITUDE AFTER CLR OF CONFLICT. WE FELT COLLISION WAS IMMINENT. ELAPSED TIME FROM ATC ADVISORY TO RECOVERY WAS APPROX 15 SECONDS.

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.