Narrative:

We were cleared for a visual approach to runway 17C. I was extra alert, because I just heard a situation over the frequency where an SF340 (aircraft Z) was vectored too late onto the localizer and an air carrier had to climb due to an RA on his TCASII. ATC and air carrier were arguing on the frequency. Suddenly, I saw an air carrier B757 (aircraft Y), a couple mi in front of us, diving out of 3500-3800 ft on a visual approach to runway 17C also. We were over(under) taking that traffic fast. I called ATC and reported traffic. I asked where the traffic was going, no answer, just a turn to 130 degree heading (from 175 degree heading), and then back to 240 degree heading to re-intercept. (I knew then that the B757 was also going to runway 17C...and we were about to be pancaked by a B757.) it wasn't going to work. We were too close behind that B757 and still over(under) taking! (I was reducing speed fast.) ATC realized it and gave us 080 degree heading, go around, up to 3000 ft. After landing, I called ATC on the phone, to report incident and find out what happened. On aug/mon/01, I learned from our air carrier, that the controller is receiving extra training and internal audit is underway.

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Original NASA ASRS Text

Title: E135 FLC INITIATE EVASIVE MANEUVER DUE TO CONFLICTING B757 WHILE ON APCH TO DFW RWY 17C.

Narrative: WE WERE CLRED FOR A VISUAL APCH TO RWY 17C. I WAS EXTRA ALERT, BECAUSE I JUST HEARD A SIT OVER THE FREQ WHERE AN SF340 (ACFT Z) WAS VECTORED TOO LATE ONTO THE LOC AND AN ACR HAD TO CLB DUE TO AN RA ON HIS TCASII. ATC AND ACR WERE ARGUING ON THE FREQ. SUDDENLY, I SAW AN ACR B757 (ACFT Y), A COUPLE MI IN FRONT OF US, DIVING OUT OF 3500-3800 FT ON A VISUAL APCH TO RWY 17C ALSO. WE WERE OVER(UNDER) TAKING THAT TFC FAST. I CALLED ATC AND RPTED TFC. I ASKED WHERE THE TFC WAS GOING, NO ANSWER, JUST A TURN TO 130 DEG HDG (FROM 175 DEG HDG), AND THEN BACK TO 240 DEG HDG TO RE-INTERCEPT. (I KNEW THEN THAT THE B757 WAS ALSO GOING TO RWY 17C...AND WE WERE ABOUT TO BE PANCAKED BY A B757.) IT WASN'T GOING TO WORK. WE WERE TOO CLOSE BEHIND THAT B757 AND STILL OVER(UNDER) TAKING! (I WAS REDUCING SPD FAST.) ATC REALIZED IT AND GAVE US 080 DEG HDG, GAR, UP TO 3000 FT. AFTER LNDG, I CALLED ATC ON THE PHONE, TO RPT INCIDENT AND FIND OUT WHAT HAPPENED. ON AUG/MON/01, I LEARNED FROM OUR ACR, THAT THE CTLR IS RECEIVING EXTRA TRAINING AND INTERNAL AUDIT IS UNDERWAY.

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.