In which situation is a pilot required to file a flight plan?

A pilot is required to file a flight plan primarily in situations involving controlled airspace, particularly after dark, or when specifically requested by Air Traffic Control (ATC). Filing a flight plan is a safety measure that helps ATC track the flight and provide necessary services to ensure the safety of the aircraft, especially when visibility is reduced or traffic density is higher.

In controlled airspace, ATC relies on flight plans to manage and sequence air traffic, maintaining safe distances between aircraft. After sunset, the lack of natural light increases the risks associated with visual navigation, further necessitating the need for a flight plan that provides ATC with information about intended routes, altitudes, and departure and arrival times.

While there are no specific requirements to file a flight plan for flights strictly in uncontrolled airspace, doing so can enhance safety and ensure that search and rescue operations can be initiated more effectively in case of an emergency. Therefore, the need to file a flight plan aligns directly with enhancing the safety and regulatory compliance of flight operations in specific scenarios.