What is the standard longitudinal separation for RNAV equipped aircraft?

The standard longitudinal separation for RNAV (Area Navigation) equipped aircraft is indeed 20 miles. This separation distance is utilized to ensure safety and reduce the risk of conflict between aircraft operating on the same route. RNAV systems promote increased efficiency in air navigation, allowing aircraft to fly more direct routes.

Determining appropriate separation is critical in maintaining safe distances between aircraft flying at the same altitude and in the same direction. RNAV-equipped aircraft are capable of more precise navigation, which facilitates shorter and more direct flight paths. Therefore, the 20-mile separation standard aids in accommodating the precise movements of these aircraft, particularly in busy airspace. This measure aligns with the capabilities of RNAV technology and improves air traffic management efficiency.

The other options do not reflect standard practices for RNAV-equipped aircraft. Separate minimum criteria, such as time-based separations measured in minutes, may apply primarily to non-RNAV contexts or depend on specific air traffic scenarios. Nonetheless, for RNAV operations specifically, the 20-mile separation is recognized as the standard.