Narrative:

We possibly had an near midair collision with a low wing single engine aircraft while on the final approach segment to runway 9L in fll. (Unsure of nearest proximity to other aircraft; but it may have been as close as 500 ft.) we were under the control of mia approach control and had recently been given clearance to fly a 120 degree heading; descend to 1800 ft; and cleared the ILS runway 9L approach in fll. I was the captain on this flight and also flying the approach. I had already intercepted the localizer and was making an approximately 1000 FPM descent to 1800 ft on autoplt. About 2 mi outside of the FAF; novae (approximately 9 mi from fll); approach control alerted us to nearby traffic close to our altitude. Neither of us saw him outside initially; and glancing down at the TCAS display; I saw that they were about 300 ft below us at 2 O'clock and about 2 mi. Just after receiving the warning from ATC and glancing down at the TCAS display; we received a TCAS traffic warning at which time I disconnected the autoplt and started adding power and shallowing the descent anticipating a TCAS climb command; but the initial traffic warning was closely followed by a descend command (TCAS RA) which I started doing immediately and aggressively. Seconds after I had initiated the descent; ATC then called us back telling us to climb; but our procedures instruct us to follow TCAS directions when we receive TCAS RA's. About the same time that ATC had called us back; the first officer spotted and pointed out the traffic at our 2:30 O'clock position; continuing to head north and close to our altitude (I'm guessing this was about 2300 ft). After seeing the traffic; I turned north while continuing to descend to increase separation. The northbound aircraft appeared not to see us until we were directly in front of them at which time they entered a steep turn wbound. (All the events above occurred within a very short time span.) after clearing the traffic; I corrected back to the ILS course and GS; and completed the approach and landing without further incident. The flight attendants had been given landing notification well prior to this and were seated along with the passenger; and no one reported any injuries. We came close to the other aircraft; but aren't sure exactly how close -- it may have been as close as 500 ft.

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Original NASA ASRS Text

Title: MD80 FLT CREW HAS A TCAS RA DURING APCH TO FLL.

Narrative: WE POSSIBLY HAD AN NMAC WITH A LOW WING SINGLE ENG ACFT WHILE ON THE FINAL APCH SEGMENT TO RWY 9L IN FLL. (UNSURE OF NEAREST PROX TO OTHER ACFT; BUT IT MAY HAVE BEEN AS CLOSE AS 500 FT.) WE WERE UNDER THE CTL OF MIA APCH CTL AND HAD RECENTLY BEEN GIVEN CLRNC TO FLY A 120 DEG HDG; DSND TO 1800 FT; AND CLRED THE ILS RWY 9L APCH IN FLL. I WAS THE CAPT ON THIS FLT AND ALSO FLYING THE APCH. I HAD ALREADY INTERCEPTED THE LOC AND WAS MAKING AN APPROX 1000 FPM DSCNT TO 1800 FT ON AUTOPLT. ABOUT 2 MI OUTSIDE OF THE FAF; NOVAE (APPROX 9 MI FROM FLL); APCH CTL ALERTED US TO NEARBY TFC CLOSE TO OUR ALT. NEITHER OF US SAW HIM OUTSIDE INITIALLY; AND GLANCING DOWN AT THE TCAS DISPLAY; I SAW THAT THEY WERE ABOUT 300 FT BELOW US AT 2 O'CLOCK AND ABOUT 2 MI. JUST AFTER RECEIVING THE WARNING FROM ATC AND GLANCING DOWN AT THE TCAS DISPLAY; WE RECEIVED A TCAS TFC WARNING AT WHICH TIME I DISCONNECTED THE AUTOPLT AND STARTED ADDING PWR AND SHALLOWING THE DSCNT ANTICIPATING A TCAS CLB COMMAND; BUT THE INITIAL TFC WARNING WAS CLOSELY FOLLOWED BY A DSND COMMAND (TCAS RA) WHICH I STARTED DOING IMMEDIATELY AND AGGRESSIVELY. SECONDS AFTER I HAD INITIATED THE DSCNT; ATC THEN CALLED US BACK TELLING US TO CLB; BUT OUR PROCS INSTRUCT US TO FOLLOW TCAS DIRECTIONS WHEN WE RECEIVE TCAS RA'S. ABOUT THE SAME TIME THAT ATC HAD CALLED US BACK; THE FO SPOTTED AND POINTED OUT THE TFC AT OUR 2:30 O'CLOCK POS; CONTINUING TO HEAD N AND CLOSE TO OUR ALT (I'M GUESSING THIS WAS ABOUT 2300 FT). AFTER SEEING THE TFC; I TURNED N WHILE CONTINUING TO DSND TO INCREASE SEPARATION. THE NBOUND ACFT APPEARED NOT TO SEE US UNTIL WE WERE DIRECTLY IN FRONT OF THEM AT WHICH TIME THEY ENTERED A STEEP TURN WBOUND. (ALL THE EVENTS ABOVE OCCURRED WITHIN A VERY SHORT TIME SPAN.) AFTER CLRING THE TFC; I CORRECTED BACK TO THE ILS COURSE AND GS; AND COMPLETED THE APCH AND LNDG WITHOUT FURTHER INCIDENT. THE FLT ATTENDANTS HAD BEEN GIVEN LNDG NOTIFICATION WELL PRIOR TO THIS AND WERE SEATED ALONG WITH THE PAX; AND NO ONE RPTED ANY INJURIES. WE CAME CLOSE TO THE OTHER ACFT; BUT AREN'T SURE EXACTLY HOW CLOSE -- IT MAY HAVE BEEN AS CLOSE AS 500 FT.

Data retrieved from NASA's ASRS site as of January 2009 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.