How far from the runway should an aircraft be transferred from approach to aerodrome controllers?

The correct choice indicates that aircraft should be transferred from approach to aerodrome controllers when they are 6-12 miles from the runway. This distance ensures that the aerodrome controllers have sufficient time to prepare for the arrival of the aircraft, coordinate the landing sequence, and manage any required communication with the aircraft as it approaches the airport.

When an aircraft is within this range, it allows for effective management of the traffic pattern and assists in maintaining safe separation from other aircraft. Additionally, this distance provides a buffer for the controllers to communicate critical instructions to the pilot regarding their landing clearance, approach path, and any necessary adjustments to speed or altitude as they get closer to landing.

In contrast, distances that are too close, such as 1-5 miles, may not allow sufficient time for clearances and instructions. Similarly, distances like 4-8 or 3-9 miles may not adequately cover the standard operational protocols that aim to enhance safety and efficiency in the transfer of control from approach to aerodrome.