Small Aircraft; Low Wing; 1 Eng; Retractable Gear
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 5
Training / Qualification; Situational Awareness; Communication Breakdown
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway; Ground Incursion Taxiway
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Separated Traffic; Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented; Flight Crew Rejected Takeoff
Aircraft; Company Policy; Human Factors
I was an OJTI (On The Job Instructor) on Local Control and the trainee cleared Aircraft X for takeoff. A few seconds later I observed aircraft X attempting to takeoff on a taxiway. I took over the frequency and told the aircraft to stop. The aircraft picked up the speed and did not respond. I instructed the aircraft to stop 3 more times. The aircraft finally came to a stop without further incident.Pilots need to be familiar with airport markings to prevent incidents like this. I suggest FSDO to be proactive and possibly enforcing age restrictions and stricter licensing requirements; i.e.; be able to see and hear and listen to instructions. He was not able to see his license to read us the information when asked. He stated he did not hear our numerous attempts to stop him. Pilots like these pose a great threat to the National Airspace System (NAS) and need to be looked at closely.
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LVK Tower Controllers and a pilot reported an aircraft began its takeoff roll from a taxiway instead of the runway and when aborting its takeoff taxied without a clearance five feet away from another taxiing aircraft.