What method of separation is permitted within aerodrome control when only one aircraft is allowed?

In aerodrome control, when managing the movements of aircraft, separation methods are critical to ensuring safety and efficiency. The correct answer indicates that all listed methods—radar control, geographical control, and visual control—are permitted even when only one aircraft is allowed.

Radar control involves using radar systems to maintain situational awareness and provide instructions to the aircraft to ensure it remains safely separated from any potential hazards. This method is vital for managing aircraft movements, particularly in busy airspace.

Geographical control refers to the use of fixed geographical points to manage and guide aircraft movements based on their position relative to these landmarks or defined airspace boundaries. It enhances safety by providing a structured method to follow, even when only one aircraft is operating.

Visual control relies on the pilot’s visual observations and the air traffic controller’s visual observation of the aircraft to maintain separation. This method leverages the controller's capability to see the aircraft and assess the situation in real-time.

All these methods play an important role in ensuring that even a single aircraft operates safely and efficiently within controlled airspace, emphasizing the flexibility and safety measures in place within aerodrome operations.