What is the instrument approach criteria for a Category A airplane based on?

Category A airplanes are defined in the context of instrument approaches primarily by their maximum airspeed during the final approach segment. For a Category A aircraft, the maximum airspeed is set at 90 knots. This designation is crucial because it determines the minimum approach speed configurations and the type of approach procedures that can be conducted safely.

The significance of this speed is rooted in ensuring safe operation and adequate maneuverability during the approach phase, allowing for proper stalling margin, maintaining control, and enabling effective response to any unexpected situations. The approach criteria are utilized by air traffic controllers and pilots to categorize aircraft for efficient handling in congested airspace, ensuring all operations uphold safety standards.

This criterion directly influences approach designs, including the spacing of aircraft during approaches, as well as required visibility conditions, which are tailored to the performance capabilities of the aircraft. Understanding this category is essential for pilots to plan and execute instrument approaches safely and effectively.