Duchess 76
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 180; Flight Crew Total 785; Flight Crew Type 200
Situational Awareness; Communication Breakdown; Distraction
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Flight Crew Took Evasive Action
Human Factors; Aircraft; ATC Equipment / Nav Facility / Buildings; Procedure
I was cleared for takeoff Runway 9L by MLB Tower (in Aircraft X) and started my roll. I was only monitoring Tower frequency. As I was continuing; the other aircraft (Aircraft Y); crossed Runway 9L via Taxiway Quebec. My student and I continued our roll and cleared the aircraft by about 200 feet vertically.  Following the incident; witnesses reported that Aircraft Y was cleared to cross Runway 9L via Taxiway Quebec after I was given takeoff clearance.  A dedicated Controller for Ground and Tower frequencies (each) might have prevented this incursion.
Flight Instructor reported that on takeoff roll; another aircraft crossed runway in front of them; causing Pilot to rotate and overfly other aircraft.