What TDP size is designated for unknown aircraft?

The designated size for the touch down point (TDP) for unknown aircraft is 100 meters. This standard is established to ensure adequate safety and operational space when landing or departing. When the type of aircraft is not known, a larger TDP is necessary to account for variables such as the size, weight, and rotor wash of different aircraft. This helps to provide enough room to avoid obstacles, accommodate the aircraft's takeoff and landing characteristics, and ensure the safety of personnel and equipment on the ground. Using a 100-meter TDP creates a buffer that reduces risks associated with landing unknown aircraft, which might be larger or have different requirements than commonly used types.