After the local controller inquired if an aircraft could make an intersection departure; the aircraf...

Narrative:

I was working local control position and had air carrier Y holding in position (for wake turbulence) on runway xx (at the full length). I asked aircraft X if he could depart from intersection zulu on runway xx (this was to facilitate in-trail spacing requirements). Aircraft X stated that they could and I issued taxi instructions to reflect this. Aircraft X was never told to 'line up and wait' or given a takeoff clearance. I then issued air carrier Y a takeoff clearance on runway xx from the full length. I then observed aircraft X taxi onto runway xx at intersection zulu (in front of air carrier Y). At that moment; I told air carrier Y to cancel his takeoff clearance and hold his position. I then told aircraft X to taxi off the runway and call the tower for possible pilot deviation. Although I was not required to issue hold short instructions to aircraft X; in hindsight; such an issuance would have contributed greatly to preventing this from happening.

Original NASA ASRS Text

Title: After the Local Controller inquired if an aircraft could make an intersection departure; the aircraft entered the runway without clearance in front of another aircraft on takeoff roll on the same runway.

Narrative: I was working Local Control position and had Air Carrier Y holding in position (for wake turbulence) on Runway XX (at the full length). I asked Aircraft X if he could depart from Intersection ZULU on Runway XX (this was to facilitate in-trail spacing requirements). Aircraft X stated that they could and I issued taxi instructions to reflect this. Aircraft X was never told to 'Line Up and Wait' or given a takeoff clearance. I then issued Air Carrier Y a takeoff clearance on Runway XX from the full length. I then observed Aircraft X taxi onto Runway XX at Intersection ZULU (in front of Air Carrier Y). At that moment; I told Air Carrier Y to cancel his takeoff clearance and hold his position. I then told Aircraft X to taxi off the runway and call the Tower for possible pilot deviation. Although I was not required to issue hold short instructions to Aircraft X; in hindsight; such an issuance would have contributed greatly to preventing this from happening.

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.

Attributes
ACN	983975
Time
Date	201111
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Learjet 60
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Route In Use	None
Flight Plan	IFR
Aircraft 2
Make Model Name	EMB ERJ 170/175 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Route In Use	None
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Ground Incursion Runway

After the local controller inquired if an aircraft could make an intersection departure; the aircraft entered the runway without clearance in front of another aircraft on takeoff roll on the same runway.