What must pilots maintain when flying outside controlled airspace?

When flying outside controlled airspace, pilots must maintain visual separation from other aircraft. This requirement is crucial for ensuring safety in uncontrolled environments, where air traffic control does not provide the same level of oversight as in controlled airspace. Visual separation relies on a pilot's ability to see other aircraft and make decisions based on their observed positions and movements.

In uncontrolled airspace, pilots are responsible for their own navigation and traffic avoidance. Thus, they must be vigilant and proficient in their ability to visually scan for other aircraft and maintain safe distances to prevent mid-air collisions. This skill is essential, as the lack of air traffic control means that pilots cannot rely on external guidance for traffic separation, underscoring the importance of maintaining visual awareness. Maintaining visual separation is not just about avoiding others but also about ensuring safe and efficient flight operations.