Date: 201704
Local time of day: 1201-1800
Location: SRQ.Airport, FL
Flight conditions: VMC
Light: Daylight
Aircraft: Cessna Single Piston Undifferentiated or Other Model
Operator: Personal
Operating under: Part 91
Flight phase: Taxi
ATC / advisory: Tower SRQ
Second aircraft: Cessna Single Piston Undifferentiated or Other Model
Reporter organization: Government
Reporter function: Ground
Reporter qualification: Air Traffic Control Fully Certified
Human factors: Situational Awareness
Second reporter function: Local
Anomaly: ATC Issue All Types; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Detector: Person Air Traffic Control
When detected: In-flight; Taxi
Result: Air Traffic Control Issued New Clearance; Flight Crew Executed Go Around / Missed Approach; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Took Evasive Action; General Flight Cancelled / Delayed
Contributing factors: Aircraft; Human Factors; Procedure
Primary problem: Human Factors

Narrative: Aircraft X was taxied to Runway 14 at intersection F. I wrote 'F/14' on the flight progress strip and I verbally told Local Control that Aircraft X is at F intersection. As I was working I heard the Controller in Charge tell Local control to stop that aircraft. I spotted Aircraft X rolling past the hold short line at Taxiway F and Runway 14 as Aircraft Y was moving at a high speed on Runway 14 approximately 500 feet from intersection F. I loudly spoke 'STOP STOP'. Local Controller successfully got Aircraft X to stop just short of the runway edge.This is a firm reminder of the importance of scan and situational awareness. The Controller in Charge did a fantastic job jumping in just in time to prevent Aircraft X from entering Runway 14. I will continue to remain focused while working in the Tower. We need to identify each aircraft and find out their location before we issue control instructions.


Second narrative: Aircraft Y was VFR was on a GPS full stop approach to Runway 14. Aircraft X was at Runway14 intersection F awaiting departure. Aircraft X's VFR flight strip was marked with the proper 'intersection' departure markings per the Standard Operating Procedure. I looked at Aircraft X's strip when it was handed to me and I mentally noted he was an intersection departure then set it in my bay. Aircraft Y was almost over the threshold when Aircraft X called ready for departure. I had previously cleared Aircraft Z to land. When Aircraft X called ready; I immediately told Aircraft Z that his landing clearance was cancelled and told him to continue because traffic would be holding in position. Then I then told Aircraft X to lineup and wait without looking at his strip again. I went back to see Aircraft Y about to touch down between C1 and F taxiway intersections. Ground Control told me to stop 'that guy' (Aircraft X).I then realized I had forgotten he was at the intersection. I told Aircraft X to hold short. Aircraft X had already crossed the hold short lines; but he stopped before entering the actual runway. Aircraft Y saw this and said he was going around. I told Aircraft Y to go around and enter left close traffic. I then told Aircraft X to cross Runway 14; and to taxi full length Runway 14; via Alfa; which he did. I then cleared Aircraft Z to land. Aircraft Y came back around and landed behind Aircraft Z without incident.I can say I probably got distracted when Aircraft X called ready and I looked up to check my radar scope to see if Aircraft X was far enough out to cancel his landing clearance and would have enough time to get my departure out. Once I saw Aircraft Y cross the threshold I mentally noted it was now okay to put Aircraft X in position. I believe I got distracted with the whole process. I don't believe anything other than rescanning my strips or scanning the taxiways. I was scanning the runway to see Aircraft Y was landing instead of looking mid field where Aircraft X was.


Synopsis: SRQ Tower Ground Controller reported observing the Local Controller clear a departing aircraft on to the runway with landing traffic on short final.