Near midair collision between a beech 1900 descending 20 mi out for approach and an unknown aircraft 200 ft above and to one side. Approach controller had issued a TA.

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Attributes
ACN	545255
Time
Date	200204
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	msl bound lower : 7500 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d01.tracon
Operator	common carrier : air taxi
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Navigation In Use	ils localizer & glide slope : 7
Flight Phase	descent : approach
Route In Use	approach : instrument precision approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d01.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 300 flight time total : 2700 flight time type : 1700
ASRS Report	545255
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued advisory controller : issued new clearance none taken : insufficient time
Miss Distance	horizontal : 200 vertical : 200
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

While coming in for a vector runway 7 into denver, co, approach control cleared us for the visual approach and also said we should descend to 7500 ft for traffic. I have no idea what this traffic was doing at 8000 ft and 20 NM west of runway 7, but he got a little low and set off our TCASII. TCASII was saying that he was 1200 ft from us.

Original NASA ASRS Text

Title: NMAC BTWN A BEECH 1900 DSNDING 20 MI OUT FOR APCH AND AN UNKNOWN ACFT 200 FT ABOVE AND TO ONE SIDE. APCH CTLR HAD ISSUED A TA.

Narrative: WHILE COMING IN FOR A VECTOR RWY 7 INTO DENVER, CO, APCH CTL CLRED US FOR THE VISUAL APCH AND ALSO SAID WE SHOULD DSND TO 7500 FT FOR TFC. I HAVE NO IDEA WHAT THIS TFC WAS DOING AT 8000 FT AND 20 NM W OF RWY 7, BUT HE GOT A LITTLE LOW AND SET OFF OUR TCASII. TCASII WAS SAYING THAT HE WAS 1200 FT FROM US.

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.