When issuing a void time, if the time to “Advise” is in the next hour, what format should be used?

When issuing a void time in the context of air traffic control, using the correct format is crucial to ensure clarity and accuracy in communication. The standard practice for issuing a void time consists of four digits, which reflect the hour and minute of the void time.

When the time to "Advise" is within the next hour, the format should state the time in Coordinated Universal Time (UTC) or local time, depending on the airspace and procedure in use. This four-digit format helps air traffic controllers maintain consistency when relaying important information. For example, if the void time is set for 15:30, you would communicate this as "1530" to provide pilots with a clear and unmistakable instruction.

Utilizing four digits is essential because it provides a complete representation of the time to avoid any misinterpretation or confusion that could arise from using fewer digits. In contrast, two or three-digit formats would be insufficient and could lead to ambiguity in understanding the specific time for the void notice. Hence, employing the four-digit format is vital for effective communication in air traffic control settings.