Near miss cited involving reporter's air carrier medium large transport an unknown twin engine turboprop with estimated 200 ft vertical separation. Evasive action descent made as commanded by the TCASII.

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Attributes
ACN	391823
Time
Date	199801
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tracon : dfw tracon : sna
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent : approach descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 50 flight time total : 13500 flight time type : 2700
ASRS Report	391823
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac non adherence : required legal separation non adherence : far other anomaly other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On final to runway 35R (dfw), TCASII issued TA's twice, then an RA stating 'descend now' and commanded a descent of about 1200 FPM. The descent was initiated as I saw a twin engine turboprop out the left window at a distance of between 100 and 200 yards and closing. (His heading approximately 040 degrees.) TCASII issued a 'clear of conflict' message approximately 5 seconds after initial warning. I spoke with the TRACON supervisor who reviewed the data and said that no traffic was observed on radar that conflicted with us. The other aircraft was obviously transponder/mode C equipped and by virtue of its size I would suspect he was also on an IFR flight plan.

Original NASA ASRS Text

Title: NEAR MISS CITED INVOLVING RPTR'S ACR MLG AN UNKNOWN TWIN ENG TURBOPROP WITH ESTIMATED 200 FT VERT SEPARATION. EVASIVE ACTION DSCNT MADE AS COMMANDED BY THE TCASII.

Narrative: ON FINAL TO RWY 35R (DFW), TCASII ISSUED TA'S TWICE, THEN AN RA STATING 'DSND NOW' AND COMMANDED A DSCNT OF ABOUT 1200 FPM. THE DSCNT WAS INITIATED AS I SAW A TWIN ENG TURBOPROP OUT THE L WINDOW AT A DISTANCE OF BTWN 100 AND 200 YARDS AND CLOSING. (HIS HDG APPROX 040 DEGS.) TCASII ISSUED A 'CLR OF CONFLICT' MESSAGE APPROX 5 SECONDS AFTER INITIAL WARNING. I SPOKE WITH THE TRACON SUPVR WHO REVIEWED THE DATA AND SAID THAT NO TFC WAS OBSERVED ON RADAR THAT CONFLICTED WITH US. THE OTHER ACFT WAS OBVIOUSLY XPONDER/MODE C EQUIPPED AND BY VIRTUE OF ITS SIZE I WOULD SUSPECT HE WAS ALSO ON AN IFR FLT PLAN.

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.