What does the Aircraft Approach Category (AAC) designate?

The Aircraft Approach Category (AAC) is primarily focused on the approach speed of the aircraft during landing. This classification is essential for determining the appropriate runway length and the required separation distances between aircraft during final approach and landing, ensuring that operations are conducted safely and effectively. The different categories are based on the 1.3 times the stall speed in the landing configuration, which allows for a systematic approach to managing air traffic and ensuring safety at airports.

In this context, while options relating to environmental impact, landing gear size, or passenger numbers might hold relevance in other areas of aviation or airport operations, they do not pertain to the AAC's purpose. The AAC specifically aids in categorizing aircraft to facilitate the safe management of different types of traffic in the airspace and at airfields, focusing squarely on the speeds at which these aircraft approach for landing.