What is the minimum vertical separation for autopilot operation during approach with guidance?

For autopilot operation during approach with guidance, the minimum vertical separation is indeed 80 ft. This standard is established to ensure safe operation and precise control of the aircraft during critical phases of flight such as approach and landing. The higher vertical separation requirement helps to provide a buffer against potential altitude deviations, which could result from various factors including system malfunctions or environmental variables like turbulence.

In terms of safety protocols, maintaining an 80 ft vertical separation helps reduce the risk of collision with terrain or obstacles, particularly in environments where autopilot is employed and the aircraft requires strict adherence to altitude limits. This not only enhances safety but also ensures compliance with aviation regulations that govern autopilot usage during critical flight phases.

In contrast, the other options suggest lower vertical separations that do not conform to the safety standards expected during such approaches, potentially increasing the risk of altitude conflicts or deviations. Therefore, the choice of 80 ft as the minimum vertical separation reflects both regulatory requirements and best practices in aviation safety.