What maximum speed does category E aircraft exceed?

Category E aircraft are defined as those having a stall speed in the landing configuration greater than 165 knots calibrated airspeed (KCAS). Therefore, the correct response to the question regarding the maximum speed a category E aircraft exceeds is based on its stall speed. Since category E aircraft exceed a stall speed of 165 KCAS, it is reasonable to indicate that their operational speeds would typically surpass 166 knots.

In general aviation, understanding these categories is crucial for pilots, especially when considering approach speeds, separation minima, and wake turbulence categories. The speed thresholds are essential for safety and efficient operation within controlled airspace, so identifying the stall speed as a defining factor in classifying aircraft is critical in the context of flight operations and regulations. The choices provided give various thresholds, with 166 knots being specifically relevant for category E, thus establishing it as the correct answer in this scenario.