Narrative:

Flight from nashville to knoxville, tn, had a near miss situation with a light twin in the approach phase of the flight. Shortly after we contacted tys approach, we heard approach notify a light twin (on an approximately left base to 23R) of our position and that he was cleared for a visual approach to 23R. We were considerably farther behind that aircraft and maneuvering for a right base type turn. Our altitude was approximately 4000 when we began our turn to the runway. Our speed was approximately 170 KTS. We were advised that as we turned right toward the runway the twin would be at our 12 O'clock position. I saw the aircraft and reported that to approach. They cleared us for a visual to 23R and to maintain contact with the twin. As we rolled out on the final approach course I lost visual contact with the twin. The captain never said whether or not he ever saw the other aircraft. The next time approach called, he changed our sequence. He said we would land first and then the twin. At this point I was confused as to how the other aircraft was going to be behind us. Suddenly, the captain noticed the other aircraft directly below us. I estimate that we over-took the twin and passed over him by approximately 2-500 ft and 500-1000 ft horizontally. We maintained our altitude and he proceeded to turn right and broke off his approach. There was a definite breakdown of communication. I didn't tell the captain when I lost sight of our traffic. The controller never advised us of our close proximity, even though we were cleared for a visual approach. It sure got our attention. Thank god we saw him in time.

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Original NASA ASRS Text

Title: FLC OF LTT HAD CONFLICT WITH SMA ON APCH TO TYS.

Narrative: FLT FROM NASHVILLE TO KNOXVILLE, TN, HAD A NEAR MISS SITUATION WITH A LIGHT TWIN IN THE APCH PHASE OF THE FLT. SHORTLY AFTER WE CONTACTED TYS APCH, WE HEARD APCH NOTIFY A LIGHT TWIN (ON AN APPROX L BASE TO 23R) OF OUR POS AND THAT HE WAS CLRED FOR A VISUAL APCH TO 23R. WE WERE CONSIDERABLY FARTHER BEHIND THAT ACFT AND MANEUVERING FOR A R BASE TYPE TURN. OUR ALT WAS APPROX 4000 WHEN WE BEGAN OUR TURN TO THE RWY. OUR SPD WAS APPROX 170 KTS. WE WERE ADVISED THAT AS WE TURNED R TOWARD THE RWY THE TWIN WOULD BE AT OUR 12 O'CLOCK POS. I SAW THE ACFT AND RPTED THAT TO APCH. THEY CLRED US FOR A VISUAL TO 23R AND TO MAINTAIN CONTACT WITH THE TWIN. AS WE ROLLED OUT ON THE FINAL APCH COURSE I LOST VISUAL CONTACT WITH THE TWIN. THE CAPT NEVER SAID WHETHER OR NOT HE EVER SAW THE OTHER ACFT. THE NEXT TIME APCH CALLED, HE CHANGED OUR SEQUENCE. HE SAID WE WOULD LAND FIRST AND THEN THE TWIN. AT THIS POINT I WAS CONFUSED AS TO HOW THE OTHER ACFT WAS GOING TO BE BEHIND US. SUDDENLY, THE CAPT NOTICED THE OTHER ACFT DIRECTLY BELOW US. I ESTIMATE THAT WE OVER-TOOK THE TWIN AND PASSED OVER HIM BY APPROX 2-500 FT AND 500-1000 FT HORIZLY. WE MAINTAINED OUR ALT AND HE PROCEEDED TO TURN R AND BROKE OFF HIS APCH. THERE WAS A DEFINITE BREAKDOWN OF COM. I DIDN'T TELL THE CAPT WHEN I LOST SIGHT OF OUR TFC. THE CTLR NEVER ADVISED US OF OUR CLOSE PROX, EVEN THOUGH WE WERE CLRED FOR A VISUAL APCH. IT SURE GOT OUR ATTN. THANK GOD WE SAW HIM IN TIME.

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.