Tower controller described a runway crossing conflict event after instructing the aircraft to hold s...

Attributes
ACN	978891
Time
Date	201111
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Route In Use	None
Flight Plan	IFR
Aircraft 2
Make Model Name	Regional Jet 700 ER/LR (CRJ700)
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Route In Use	None
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	Conflict Ground Conflict Critical

Narrative:

I had cleared CRJ2 for take off; and then 40 seconds later I cleared the CRJ7 to cross and immediately went back to the CRJ7 when I realized that the CRJ2 was not rolling yet and told him to hold his position. I thought he said alright; but after listening to the tapes he said good night. It appeared he was not crossing from looking out the window and at the asde-X; but then I saw him moving and this was about 20 seconds after I thought he said he was holding short; he started to cross the runway. At this time the CRJ2 had started departure roll and I went to abort his take off clearance but he was already rotating and at that time it was safer to let him depart than try and get him to stop. Recommendation; get a better read back from the aircraft crossing the runway.

Original NASA ASRS Text

Title: Tower Controller described a runway crossing conflict event after instructing the aircraft to hold short; post incident tape reviews indicated that the aircraft hold clearance readback was incorrect.

Narrative: I had cleared CRJ2 for take off; and then 40 seconds later I cleared the CRJ7 to cross and immediately went back to the CRJ7 when I realized that the CRJ2 was not rolling yet and told him to hold his position. I thought he said alright; but after listening to the tapes he said good night. It appeared he was not crossing from looking out the window and at the ASDE-X; but then I saw him moving and this was about 20 seconds after I thought he said he was holding short; he started to cross the runway. At this time the CRJ2 had started departure roll and I went to abort his take off clearance but he was already rotating and at that time it was safer to let him depart than try and get him to stop. Recommendation; get a better read back from the aircraft crossing the runway.

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 a runway crossing conflict event after instructing the aircraft to hold short; post incident tape reviews indicated that the aircraft hold clearance readback was incorrect.