An air carrier large transport had a TCASII RA in the traffic pattern.

Attributes
ACN	255026
Time
Date	199310
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 7000 msl bound upper : 7500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : den tower : lns
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other descent : approach other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach other
Route In Use	approach : straight in
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 5500 flight time type : 5000
ASRS Report	255026
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe other anomaly other other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 1000 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Final approach controller gave us cleared for visual to runway 26R after we called airport and traffic in sight. Intercept heading was 240 degrees, approximately 10 mi out. The controller then gave us a 210 degree heading and changed us to tower. We couldn't contact tower and advise them that we were now on a heading due to frequency congestion and we flew through the extended runway 26R centerline and probably encroached on the runway 26L extended centerline. About at altuna and an altitude of about 7000 ft MSL, TCASII gave an RA to descend at which time I turned right to reintercept runway 26R final. An aircraft on runway 26L final was 200 ft above and about 1000 ft laterally from us, which I had visually.

Original NASA ASRS Text

Title: AN ACR LGT HAD A TCASII RA IN THE TFC PATTERN.

Narrative: FINAL APCH CTLR GAVE US CLRED FOR VISUAL TO RWY 26R AFTER WE CALLED ARPT AND TFC IN SIGHT. INTERCEPT HDG WAS 240 DEGS, APPROX 10 MI OUT. THE CTLR THEN GAVE US A 210 DEG HDG AND CHANGED US TO TWR. WE COULDN'T CONTACT TWR AND ADVISE THEM THAT WE WERE NOW ON A HDG DUE TO FREQ CONGESTION AND WE FLEW THROUGH THE EXTENDED RWY 26R CTRLINE AND PROBABLY ENCROACHED ON THE RWY 26L EXTENDED CTRLINE. ABOUT AT ALTUNA AND AN ALT OF ABOUT 7000 FT MSL, TCASII GAVE AN RA TO DSND AT WHICH TIME I TURNED R TO REINTERCEPT RWY 26R FINAL. AN ACFT ON RWY 26L FINAL WAS 200 FT ABOVE AND ABOUT 1000 FT LATERALLY FROM US, WHICH I HAD VISUALLY.

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.