How should an aircraft be cleared for an approach when radar coverage does not exist?

When an aircraft is cleared for an approach in the absence of radar coverage, using only standard instrument procedures commencing at an Initial Approach Fix (IAF) is the correct approach. This method ensures that the aircraft follows predefined routes that have been established for safety and standardization, adhering to the published instrument approach procedures designed for that specific airport.

Standard instrument procedures provide important guidance for the aircraft, helping to manage separation and ensuring that the flight remains within controlled airspace, especially during descent and approach phases. The IAF is a designated point on the instrument approach that allows the aircraft to transition from en-route flight to the approach, thereby providing a structured and predictable path to the runway.

Choosing this method ensures that all required altitude restrictions, navigational requirements, and safety standards are followed, which is particularly important when radar support is lacking. Other options, such as clearing the aircraft without restrictions or offering visual approaches, may not ensure proper separation and safety in these conditions, while the clear methodology of starting at an IAF integrates necessary safety protocols and conforms to air traffic management practices.