Close proximity air carrier medium large transport making IAP ILS approach and airport ground vehicle too near runway. Fog reduced visibility to 6000'.

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Attributes
ACN	101011
Time
Date	198812
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl bound lower : 50 agl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach landing : go around
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 11000 flight time type : 1200
ASRS Report	101011
Person 2
Affiliation	company : air carrier
Function	observation : observer
Qualification	pilot : commercial pilot : flight engineer pilot : instrument pilot : private
Experience	flight time total : 5000 flight time type : 70
ASRS Report	101010
Events
Anomaly	conflict : ground critical incursion : runway non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Miss Distance	vertical : 150
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were on final approach on runway 17L at dfw and had been cleared to land. We got the approach lights in sight about 250' AGL and the runway in sight above 200' AGL. Visibility was restr by fog. As we were approaching the runway, I saw an object with flashing lights about 3000-4000' down the runway and left (east) of the centerline. Initially, I thought it was a light airplane but then I saw someone running toward the vehicle. I initiated a go-around. During the go-around we broke out of the WX about 2000' MSL and saw a large aircraft just slightly above and about 3 mi in front of us, same direction.

Original NASA ASRS Text

Title: CLOSE PROX ACR MLG MAKING IAP ILS APCH AND ARPT GND VEHICLE TOO NEAR RWY. FOG REDUCED VISIBILITY TO 6000'.

Narrative: WE WERE ON FINAL APCH ON RWY 17L AT DFW AND HAD BEEN CLRED TO LAND. WE GOT THE APCH LIGHTS IN SIGHT ABOUT 250' AGL AND THE RWY IN SIGHT ABOVE 200' AGL. VISIBILITY WAS RESTR BY FOG. AS WE WERE APCHING THE RWY, I SAW AN OBJECT WITH FLASHING LIGHTS ABOUT 3000-4000' DOWN THE RWY AND LEFT (EAST) OF THE CENTERLINE. INITIALLY, I THOUGHT IT WAS A LIGHT AIRPLANE BUT THEN I SAW SOMEONE RUNNING TOWARD THE VEHICLE. I INITIATED A GO-AROUND. DURING THE GO-AROUND WE BROKE OUT OF THE WX ABOUT 2000' MSL AND SAW A LARGE ACFT JUST SLIGHTLY ABOVE AND ABOUT 3 MI IN FRONT OF US, SAME DIRECTION.

Data retrieved from NASA's ASRS site as of August 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.