Narrative:

Aircraft a was in position on runway 32L at an intersection awaiting departure when I took over the north side local control position. I cleared aircraft B to land on runway 9L. Believing aircraft a to be in position on runway 32R for departure I cleared that aircraft for takeoff using runway 32R in the clearance. Aircraft a acknowledged clearance omitting runway. Approximately 30 seconds later, aircraft a reported he was aborting takeoff due to 'traffic crossing downfield.' aircraft a had slowed down enough to turn off runway 32L prior to the projected flight path of arriving aircraft B. Steam from power plant continuously obscures approach end of runways 27R and 32R, during the fall and winter season. Having watched a runway 32R departure as I plugged in to take position I believed aircraft a to be in position on that same runway. Incident occurred after only a min or so on the position.

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Original NASA ASRS Text

Title: ATCT LCL CTLR CLRED AN ATR42 FOR TKOF ON RWY 32L THINKING HE WAS ON RWY 32R. ACFT ABORTED TKOF WHEN HE SIGHTED A KING AIR ON FINAL FOR RWY 9L. SYS ERROR.

Narrative: ACFT A WAS IN POS ON RWY 32L AT AN INTXN AWAITING DEP WHEN I TOOK OVER THE N SIDE LCL CTL POS. I CLRED ACFT B TO LAND ON RWY 9L. BELIEVING ACFT A TO BE IN POS ON RWY 32R FOR DEP I CLRED THAT ACFT FOR TKOF USING RWY 32R IN THE CLRNC. ACFT A ACKNOWLEDGED CLRNC OMITTING RWY. APPROX 30 SECONDS LATER, ACFT A RPTED HE WAS ABORTING TKOF DUE TO 'TFC XING DOWNFIELD.' ACFT A HAD SLOWED DOWN ENOUGH TO TURN OFF RWY 32L PRIOR TO THE PROJECTED FLT PATH OF ARRIVING ACFT B. STEAM FROM PWR PLANT CONTINUOUSLY OBSCURES APCH END OF RWYS 27R AND 32R, DURING THE FALL AND WINTER SEASON. HAVING WATCHED A RWY 32R DEP AS I PLUGGED IN TO TAKE POS I BELIEVED ACFT A TO BE IN POS ON THAT SAME RWY. INCIDENT OCCURRED AFTER ONLY A MIN OR SO ON THE POS.

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.