What characterizes a high-performance aeroplane?

A high-performance aeroplane is characterized by a specific set of criteria that defines its operational capabilities. The correct answer indicates that a high-performance aeroplane requires a minimum flight crew of one and has a maximum velocity for normal operations (VNE) of 250 KIAS or greater.

This definition is crucial as it emphasizes that a high-performance aeroplane can be operated by a single pilot, allowing for greater flexibility in operations while still maintaining a high level of performance. The higher VNE signifies that the aircraft is designed for faster speeds, thus providing capabilities suitable for more advanced flight operations. The significant performance potential of these aircraft often aligns with complex systems and requires pilot proficiency in handling the increased speed and performance characteristics.

In contrast, options like having a minimum flight crew of two or having a VNE less than 250 KIAS would classify the aircraft differently, either as a multi-pilot operation or as a slower performance aircraft, which would not fit the high-performance designation. Additionally, the specification regarding special certification for operations below or above certain speed thresholds helps to clarify the additional regulatory requirements but does not specifically define a high-performance aeroplane as effectively as the correct choice.