Tower controller described a loss of runway separation event when changing a 'land long' approval to...

Attributes
ACN	1116024
Time
Date	201309
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PC-12
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Flight Plan	IFR
Aircraft 2
Make Model Name	Champion Citabria 7ECA
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Flight Plan	VFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Person 2
Function	Pilot Flying Captain Single Pilot
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 8000 Flight Crew Type 1000
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Ground Incursion Runway

Narrative:

Working local control I cleared aircraft X to land and the pilot asked for a long roll out. I approved the long roll out but after the aircraft landed they were taxiing at a slow rate and I had departures to get out so I canceled the long roll out and told the aircraft to turn right on bravo; hold short runway 19 and remain my frequency. The aircraft read back 'turn right on bravo'. I missed the read back of hold short runway 19. I cleared aircraft Y for takeoff on runway 19. During the takeoff roll aircraft X crossed runway 19 hold short line on bravo. As aircraft X crossed the line they asked if I wanted them to continue and I told them to stop. At that time aircraft Y was at rotation speed and became airborne around taxiway golf. Aircraft X stopped with most of the plane across the runway hold short line before the white runway edge line. Aircraft Y crossed taxiway bravo at approximately 20 ft. I then taxied aircraft X to parking. Recommendation; listen closer to read backs and for pilots not to cross or taxi on runways unless told to do so.

Original NASA ASRS Text

Title: Tower Controller described a loss of runway separation event when changing a 'land long' approval to an 'exit the runway' clearance with a hold short clearance; the hold short instruction confused by all involved.

Narrative: Working Local Control I cleared Aircraft X to land and the pilot asked for a long roll out. I approved the long roll out but after the aircraft landed they were taxiing at a slow rate and I had departures to get out so I canceled the long roll out and told the aircraft to turn right on Bravo; hold short Runway 19 and remain my frequency. The aircraft read back 'turn right on Bravo'. I missed the read back of hold short Runway 19. I cleared Aircraft Y for takeoff on Runway 19. During the takeoff roll Aircraft X crossed Runway 19 hold short line on Bravo. As Aircraft X crossed the line they asked if I wanted them to continue and I told them to stop. At that time Aircraft Y was at rotation speed and became airborne around Taxiway Golf. Aircraft X stopped with most of the plane across the runway hold short line before the white runway edge line. Aircraft Y crossed Taxiway Bravo at approximately 20 FT. I then taxied Aircraft X to parking. Recommendation; listen closer to read backs and for pilots not to cross or taxi on runways unless told to do so.

Data retrieved from NASA's ASRS site as of July 2013 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 loss of runway separation event when changing a 'land long' approval to an 'exit the runway' clearance with a hold short clearance; the hold short instruction confused by all involved.