In aviation terminology, how quickly must a 'rapid' change occur?

A 'rapid' change in aviation terminology is defined as occurring in less than 30 minutes. This timeframe indicates that the change must be implemented swiftly to ensure safety and efficiency in operations. In the context of aviation, where conditions can be unpredictable, such rapid changes can include adjustments to flight plans, weather-related modifications, or quick operational decisions that need to be made in response to dynamic circumstances. The specification of less than 30 minutes emphasizes the urgency and the need for immediate action to address critical situations effectively.