Flight crew of B757 receives TCASII RA alert turning final at dfw.

Attributes
ACN	424760
Time
Date	199901
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 4000 msl bound upper : 4000
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Navigation In Use	Other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Fokker 100
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	424760
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
ASRS Report	425199
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	other other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

We were on tight base leg for runway 17C. ATC cleared us for the visual approach to runway 17C. They cleared us to maintain 4000 ft until turning final. They also reported an F100 to us. I don't recall if we reported the traffic in sight. I did not see it, the first officer thinks he saw it, but there was a lot of traffic at the time. They vectored us in close and kept us high. As I started my turn to final, I started my descent. I then got a TCASII RA with a climb command. ATC told us to maintain 4000 ft. I considered myself to be turning final at the time. An F100 flew underneath us. We flew clear of the aircraft, responding to the RA, then continued our approach. We landed safely. Supplemental information from acn 425199: I briefly saw traffic and thought was passing under us. As we began turn to final, received TCASII RA to climb. Responded with climb, cleared traffic and landed safely.

Original NASA ASRS Text

Title: FLC OF B757 RECEIVES TCASII RA ALERT TURNING FINAL AT DFW.

Narrative: WE WERE ON TIGHT BASE LEG FOR RWY 17C. ATC CLRED US FOR THE VISUAL APCH TO RWY 17C. THEY CLRED US TO MAINTAIN 4000 FT UNTIL TURNING FINAL. THEY ALSO RPTED AN F100 TO US. I DON'T RECALL IF WE RPTED THE TFC IN SIGHT. I DID NOT SEE IT, THE FO THINKS HE SAW IT, BUT THERE WAS A LOT OF TFC AT THE TIME. THEY VECTORED US IN CLOSE AND KEPT US HIGH. AS I STARTED MY TURN TO FINAL, I STARTED MY DSCNT. I THEN GOT A TCASII RA WITH A CLB COMMAND. ATC TOLD US TO MAINTAIN 4000 FT. I CONSIDERED MYSELF TO BE TURNING FINAL AT THE TIME. AN F100 FLEW UNDERNEATH US. WE FLEW CLR OF THE ACFT, RESPONDING TO THE RA, THEN CONTINUED OUR APCH. WE LANDED SAFELY. SUPPLEMENTAL INFO FROM ACN 425199: I BRIEFLY SAW TFC AND THOUGHT WAS PASSING UNDER US. AS WE BEGAN TURN TO FINAL, RECEIVED TCASII RA TO CLB. RESPONDED WITH CLB, CLRED TFC AND LANDED SAFELY.

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.