Narrative:

We were on a descent for approach to runway 17L, dfw when cleared to 5000 ft and given a turn to 270 degree heading. Approximately 1 1/2 mins later, we were given a 210 degree heading and, a descent to 3000 ft and asked if runway in sight. We acknowledged and were cleared for visual 17L with a 'contact the tower' direction. Controller then stated, 'before you go to tower, you have traffic at 1 O'clock, 2 mi -- an medium large transport right base for 18R.' I do not recall the exact wording. I looked to my right and did not quickly locate the traffic. I looked at TCASII, then outside again and spotted it. By the time I sighted the traffic, the TCASII had gone from 'traffic, traffic' to 'climb, climb' with the traffic approximately 1/2 mi, slightly below (100-200 ft) our position and turning to the right. During this time, I had turned onto final using approximately 15 degree bank to align for centerline. We were at approximately 2600 ft and descending for the approach when we began an immediate climb in response to TCASII. While climbing, we had traffic in sight. The conflicting aircraft continued to close on us and drop lower from our position. Closest point of conflict: 1/8 mi to just underneath and approximately 300-500 ft lateral separation. Remind you, we were cleared for an approach! Hardly separation between parallel approachs to east/west runways. The conflicting aircraft appeared to be in about 45 degree bank and I believe if it had not steepened it's bank, it would have moved under us and, perhaps, a 1/4 mi to our left! Because of the conflict, we ensured our position never drifted right of centerline. At approximately 6.5 mi DME, we stopped climb in response to the TCASII 'clear of conflict' call and the visual indication we were diverging. We reached a maximum height of approximately 3100 ft, went into full landing confign, descended at 1700-1900 FPM to reintercept the glide path. We reestablished at about 1 1/2 mi DME from runway with an uneventful landing.

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Original NASA ASRS Text

Title: MLG ASSIGNED VISUAL APCH AND ADVISED OF TFC FOR PARALLEL RWY OPPOSITE DIRECTION, BASE LEG ENTRY. TCASII GAVE CLB AS CREW SIGHTED ACFT. IT MADE STEEP TURN AND CONTINUED DSCNT BENEATH THEM.

Narrative: WE WERE ON A DSCNT FOR APCH TO RWY 17L, DFW WHEN CLRED TO 5000 FT AND GIVEN A TURN TO 270 DEG HDG. APPROX 1 1/2 MINS LATER, WE WERE GIVEN A 210 DEG HDG AND, A DSCNT TO 3000 FT AND ASKED IF RWY IN SIGHT. WE ACKNOWLEDGED AND WERE CLRED FOR VISUAL 17L WITH A 'CONTACT THE TWR' DIRECTION. CTLR THEN STATED, 'BEFORE YOU GO TO TWR, YOU HAVE TFC AT 1 O'CLOCK, 2 MI -- AN MLG R BASE FOR 18R.' I DO NOT RECALL THE EXACT WORDING. I LOOKED TO MY R AND DID NOT QUICKLY LOCATE THE TFC. I LOOKED AT TCASII, THEN OUTSIDE AGAIN AND SPOTTED IT. BY THE TIME I SIGHTED THE TFC, THE TCASII HAD GONE FROM 'TFC, TFC' TO 'CLB, CLB' WITH THE TFC APPROX 1/2 MI, SLIGHTLY BELOW (100-200 FT) OUR POS AND TURNING TO THE R. DURING THIS TIME, I HAD TURNED ONTO FINAL USING APPROX 15 DEG BANK TO ALIGN FOR CTRLINE. WE WERE AT APPROX 2600 FT AND DSNDING FOR THE APCH WHEN WE BEGAN AN IMMEDIATE CLB IN RESPONSE TO TCASII. WHILE CLBING, WE HAD TFC IN SIGHT. THE CONFLICTING ACFT CONTINUED TO CLOSE ON US AND DROP LOWER FROM OUR POS. CLOSEST POINT OF CONFLICT: 1/8 MI TO JUST UNDERNEATH AND APPROX 300-500 FT LATERAL SEPARATION. REMIND YOU, WE WERE CLRED FOR AN APCH! HARDLY SEPARATION BTWN PARALLEL APCHS TO E/W RWYS. THE CONFLICTING ACFT APPEARED TO BE IN ABOUT 45 DEG BANK AND I BELIEVE IF IT HAD NOT STEEPENED IT'S BANK, IT WOULD HAVE MOVED UNDER US AND, PERHAPS, A 1/4 MI TO OUR L! BECAUSE OF THE CONFLICT, WE ENSURED OUR POS NEVER DRIFTED R OF CTRLINE. AT APPROX 6.5 MI DME, WE STOPPED CLB IN RESPONSE TO THE TCASII 'CLR OF CONFLICT' CALL AND THE VISUAL INDICATION WE WERE DIVERGING. WE REACHED A MAX HEIGHT OF APPROX 3100 FT, WENT INTO FULL LNDG CONFIGN, DSNDED AT 1700-1900 FPM TO REINTERCEPT THE GLIDE PATH. WE REESTABLISHED AT ABOUT 1 1/2 MI DME FROM RWY WITH AN UNEVENTFUL LNDG.

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.