B737-500 flight crew rejects a takeoff due to possible runway incursion at dfw.

Attributes
ACN	721951
Time
Date	200612
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dtw.airport
State Reference	MI
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : dtw.tower
Operator	common carrier : air carrier
Make Model Name	Airbus Industrie Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 226
ASRS Report	721951
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 219
ASRS Report	721949
Events
Anomaly	incursion : runway
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : rejected takeoff
Supplementary
Problem Areas	Flight Crew Human Performance Environmental Factor ATC Human Performance Airport
Primary Problem	Ambiguous

Narrative:

Observed aircraft crossing runway centerline at end of runway during takeoff. Rejected takeoff and taxied clear of runway. The aircraft was in fact on taxiway J past the end of the runway. I was not able to verify that the aircraft was not crossing our runway due to low light conditions (early morning and overcast with runway lights on). I elected to reject the takeoff. Tower could advise that an aircraft is crossing on taxiway J when issuing takeoff clearance. The aircraft in question was a large airbus and looked closer than he actually was.

Original NASA ASRS Text

Title: B737-500 FLT CREW REJECTS A TKOF DUE TO POSSIBLE RWY INCURSION AT DFW.

Narrative: OBSERVED ACFT XING RWY CTRLINE AT END OF RWY DURING TKOF. REJECTED TKOF AND TAXIED CLR OF RWY. THE ACFT WAS IN FACT ON TXWY J PAST THE END OF THE RWY. I WAS NOT ABLE TO VERIFY THAT THE ACFT WAS NOT XING OUR RWY DUE TO LOW LIGHT CONDITIONS (EARLY MORNING AND OVCST WITH RWY LIGHTS ON). I ELECTED TO REJECT THE TKOF. TWR COULD ADVISE THAT AN ACFT IS XING ON TXWY J WHEN ISSUING TKOF CLRNC. THE ACFT IN QUESTION WAS A LARGE AIRBUS AND LOOKED CLOSER THAN HE ACTUALLY WAS.

Data retrieved from NASA's ASRS site as of January 2009 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.