Actual departure time need not be forwarded if within how many minutes of the assumed departure time?

The correct answer is based on the guidelines that state actual departure time does not need to be forwarded if it occurs within a certain window of the assumed departure time. In this case, that window is up to three minutes. This rule is in place to streamline communications and reduce unnecessary transmissions when flight operations are running in close alignment with the expected schedule.

When a departure occurs that is within this three-minute range, it is generally understood that departure management and operational coordination do not require an update, thereby allowing controllers to focus on more significant changes in departure times or other operational updates. This helps maintain efficiency in radar operations, minimizing workload without compromising safety or situational awareness.

Understanding this guideline is important for effective communication and workload management in an air traffic control environment, emphasizing the importance of streamlined information flow in situations where slight delays do not impact operational safety or efficiency.