Tower controller described runway event when departure was cleared for takeoff with traffic clearing...

Attributes
ACN	831399
Time
Date	200904
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Non Radar 26.5
Events
Anomaly	ATC Issue All Types Conflict Ground Conflict Less Severe

Narrative:

Yesterday; I reported this incident noting there was no loss of separation. It now appears that a loss of separation might have occurred. I departed aircraft X on runway without activating the runway. Ground control had a single engine airplane crossing the runway (2;600 ft away from aircraft X on a 2;800 ft runway). I originally thought aircraft X had not started his takeoff roll until after the other airplane's crossing was complete. The ground controller and fdc think aircraft X was rolling while the other airplane was still on the runway. I did not see aircraft X's position; I don't know for sure. A loss of separation may have occurred.

Original NASA ASRS Text

Title: Tower Controller described runway event when departure was cleared for takeoff with traffic clearing at the opposite end of the runway.

Narrative: Yesterday; I reported this incident noting there was no loss of separation. It now appears that a loss of separation might have occurred. I departed Aircraft X on runway without activating the runway. Ground Control had a single engine airplane crossing the runway (2;600 FT away from Aircraft X on a 2;800 FT runway). I originally thought Aircraft X had not started his takeoff roll until after the other airplane's crossing was complete. The Ground Controller and FDC think Aircraft X was rolling while the other airplane was still on the runway. I did not see Aircraft X's position; I don't know for sure. A loss of separation may have occurred.

Data retrieved from NASA's ASRS site as of April 2012 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.

Tower controller described runway event when departure was cleared for takeoff with traffic clearing at the opposite end of the runway.