Air Traffic Control Fully Certified
Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance
Human Factors
I was working Local. I told Air Carrier Y to XXXX after traffic had crossed threshold. After traffic exited; I inadvertently cleared Air Carrier X to land instead of Air Carrier Y to takeoff. I did not notice my error. After a bit of time I became concerned Air Carrier Y was not rolling and it was getting close. Ground Controller questioned whether I had in fact cleared Air Carrier Y to takeoff. I cleared him for immediate. Distance was not sufficient for takeoff so I cancelled takeoff clearance and sent Air Carrier X around. I did not think I was capable of such a wrong transmission in the first place.
Tower Controller described a runway conflict when failing to note that incorrect clearances were issued to the landing and departing aircraft.