Which of the following is the correct radio message format to initiate contact with an aircraft?

The format specified in the correct answer is structured to ensure clear and effective communication between air traffic control (ATC) and the aircraft. When initiating contact with an aircraft, it's essential to start with the identification of the aircraft. This helps the pilot recognize who is trying to reach them immediately, as it establishes context for the communication. Following this is the identification of the ATC unit, which informs the pilot who they are conversing with and indicates the relevant controlling authority.

Next, the message itself is conveyed, providing the necessary information or instructions to the pilot. The inclusion of "OVER" at this stage is only required if you expect a response from the aircraft. However, many modern ATC communications do not utilize "OVER," as it can often be inferred when the message is complete.

This structured approach minimizes confusion and enhances clarity during communications, which are critical in the high-stakes environment of aviation. Proper format and protocol are essential for maintaining safety and efficiency in air traffic control operations.