What could be considered reckless operation of an aircraft during engine run-up?

Allowing rocks and debris to be directed toward other aircraft or persons is considered reckless operation during engine run-up because it poses a significant safety hazard. During a run-up, the aircraft's engine is tested at higher RPMs, which generates substantial airflow and can easily kick up loose material from the ground. This debris can cause damage to other aircraft or harm individuals nearby. Implementing safety measures, such as ensuring that the area is clear of obstacles and maintaining a safe distance from other aircraft and people, is crucial to prevent accidents and enhance overall safety during this procedure. Thus, directing debris away or ensuring it doesn’t affect others is integral to responsible aircraft operation.