No unauthorized person shall approach within how many feet of a helicopter when the rotor blades are turning?

The correct distance that an unauthorized person should maintain from a helicopter when the rotor blades are turning is 50 feet. This guideline is in place primarily for safety reasons. The rotation of the blades can create significant hazards, including the potential for being struck by the blades or experiencing the downwash created by the rotor system, which can propel debris or other objects towards individuals nearby. To ensure the safety of personnel and minimize the risk of accidents, maintaining a distance of 50 feet from the helicopter helps to establish a safe perimeter around the aircraft during operations. This standard is widely accepted in aviation safety protocols, reinforcing the importance of maintaining awareness and compliance in a rigging or loading environment involving helicopters.