No person shall start any aircraft engine on the Sierraville-Dearwater Airport:
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/or
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, buildings, or can cause injury to passengers, spectators, or other personnel.