Tower controller in training issued a 'cancel takeoff clearance' to an air carrier departure when no...

Narrative:

A gulfstream was given the traffic in position and told to cross runway xxl and taxi into parking. Air carrier X was told to line up and wait on xxl. Aircraft Y asked me to verify the landing clearance on xxl. I told aircraft Y; 'runway xxr clear to land.' there was no response from aircraft Y. I asked aircraft Y to verify runway xxr; the right side; clear to land. Aircraft Y said he needed xxl to land. I scanned the runway and saw that the gulfstream was halfway across the runway. Using anticipated separation; I cleared air carrier X for takeoff. I scanned the runway again and noticed that the gulfstream was still on the runway and moving slowly. I told air carrier X to stop the roll. My trainer reiterated; 'air carrier X hold your position; cancel takeoff clearance.' air carrier X acknowledged cancel takeoff roll. I sent aircraft Y around. Air carrier X requested a place to park for brake cooling numbers. I feel that often times in training; there has to be a certain traffic count for management to feel that training is productive. However; this puts the trainee in a position where he/she may not have worked the position in several days. I feel that continuous training; regardless of traffic count; is good for the trainee to keep them in the groove of working that position.

Original NASA ASRS Text

Title: Tower Controller in training issued a 'cancel takeoff clearance' to an air carrier departure when noting a previous cleared runway crossing aircraft still on the runway.

Narrative: A Gulfstream was given the traffic in position and told to cross Runway XXL and taxi into parking. Air Carrier X was told to line up and wait on XXL. Aircraft Y asked me to verify the landing clearance on XXL. I told aircraft Y; 'Runway XXR clear to land.' There was no response from Aircraft Y. I asked aircraft Y to verify Runway XXR; the right side; clear to land. Aircraft Y said he needed XXL to land. I scanned the runway and saw that the Gulfstream was halfway across the runway. Using anticipated separation; I cleared Air Carrier X for takeoff. I scanned the runway again and noticed that the Gulfstream was still on the runway and moving slowly. I told Air Carrier X to stop the roll. My trainer reiterated; 'Air Carrier X hold your position; cancel takeoff clearance.' Air Carrier X acknowledged cancel takeoff roll. I sent aircraft Y around. Air Carrier X requested a place to park for brake cooling numbers. I feel that often times in training; there has to be a certain traffic count for Management to feel that training is productive. However; this puts the trainee in a position where he/she may not have worked the position in several days. I feel that continuous training; regardless of traffic count; is good for the trainee to keep them in the groove of working that position.

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	954682
Time
Date	201106
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	Final Approach
Person 1
Function	Local
Qualification	Air Traffic Control Developmental
Person 2
Function	Local
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Conflict Ground Conflict Critical Deviation - Procedural Published Material / Policy

Tower controller in training issued a 'cancel takeoff clearance' to an air carrier departure when noting a previous cleared runway crossing aircraft still on the runway.