No person shall start any aircraft engine on the county airports:
A. Unless a competent operator is at the controls and
B. Unless the aircraft is equipped with adequate brakes fully applied or the wheels are securely blocked with blocks or chocks that can be removed safely and
C. When the aircraft is in such a position that the propeller slipstream or jet blast can cause damage to, or interfere with the operation of, other aircraft, vehicles, mobile equipment, hangars, shops, other buildings, or can cause injury or passengers, spectators or other personnel.
(Ord. 79-12 § 17, 1979.)