Medium large transport on 11 mi right base for 35 at dfw. TCASII RA, same altitude, direct ahead. Captain descended to clear RA.

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Attributes
ACN	197847
Time
Date	199112
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 3500 msl bound upper : 4000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
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 : 100 flight time total : 5000 flight time type : 400
ASRS Report	197847
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At 4000 ft MSL on 11 mi right base for 35R ILS approach. TCASII TA alert then RA 'descend'. Vertical speed indicator commanded 2500 FPM down and showed traffic on nose level. Descended 500 ft to 3500 ft. TCASII showed 'clear of conflict' with traffic over top of us by 300 ft. Copilot told approach control as we initiated descent, they replied 'no traffic, turn to intercept localizer.' we suspect TCASII picked up an aircraft on left base for 36L parallel runway.

Original NASA ASRS Text

Title: MLG ON 11 MI R BASE FOR 35 AT DFW. TCASII RA, SAME ALT, DIRECT AHEAD. CAPT DSNDED TO CLR RA.

Narrative: AT 4000 FT MSL ON 11 MI R BASE FOR 35R ILS APCH. TCASII TA ALERT THEN RA 'DSND'. VERT SPD INDICATOR COMMANDED 2500 FPM DOWN AND SHOWED TFC ON NOSE LEVEL. DSNDED 500 FT TO 3500 FT. TCASII SHOWED 'CLR OF CONFLICT' WITH TFC OVER TOP OF US BY 300 FT. COPLT TOLD APCH CTL AS WE INITIATED DSCNT, THEY REPLIED 'NO TFC, TURN TO INTERCEPT LOC.' WE SUSPECT TCASII PICKED UP AN ACFT ON L BASE FOR 36L PARALLEL RWY.

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.