What is the proper way to instruct an aircraft to change frequencies?

The most appropriate way to instruct an aircraft to change frequencies is to use clear and precise terminology. "Switch to my frequency (number)" effectively communicates that the aircraft must transition to the frequency specified by the controller. This directive is straightforward and direct, ensuring that pilots understand which frequency they are required to use for continuing communications.

Clarity in communication is paramount in air traffic control, as any ambiguity can lead to misunderstandings that may affect safety. By using the term "switch," it emphasizes that the aircraft should leave their current frequency and engage with the controller on the newly provided one.

Other options may lack the same clarity or directiveness, making them less suitable for effective communication in air traffic contexts. The term "change frequency to (number)" is less specific as it could leave it open-ended. "Begin communications on (number)" suggests a more passive transition rather than an immediate action. "Transfer to frequency (number)" might suggest a procedural transfer rather than a definitive instruction to switch.