At what maximum speed does category D end?

Category D aircraft are typically defined by their maximum indicated airspeed (KIAS) at the maximum landing weight. This category, which includes larger, faster jet aircraft, has a maximum speed limit of 165 KTS, but for operational purposes, this is rounded up to 166 KTS to allow for some margin in speed calculations.

In aviation training and performance classifications, understanding the boundaries of these categories is crucial for successful navigation, communication with air traffic control, and meeting regulatory requirements. Recognizing the exact thresholds helps pilots maintain compliance with speed limits during various phases of flight, particularly during approach and landing maneuvers.

The other options present speeds that fall below the maximum threshold for Category D, which is specified to be 166 KTS, making them incorrect for identifying the end of this category.