What is the diameter of a Type 1 landing zone in feet?

The diameter of a Type 1 landing zone is specified as 100 feet to ensure the safe landing and takeoff of helicopters, particularly in emergency situations. This size provides adequate space for the rotor wash and allows for sufficient clearance from any surrounding obstacles, ensuring that the aircraft can operate safely without risk of collision. The larger diameter also accommodates the necessary safety buffers for both the aircraft and any personnel or equipment that may be nearby. This dimension is established in guidelines to create a standardized landing area that can be easily recognized and utilized in various situations.