What is a key characteristic of the Contour mode of terrain flight?

A key characteristic of Contour mode in terrain flight is that it maintains a constant airspeed while allowing for variations in altitude. This operational mode is designed to follow the contours of the terrain, enabling the aircraft to navigate safely and effectively above obstacles and terrain features. By keeping the airspeed constant, pilots can better manage the aircraft's performance and responsiveness, ensuring consistent handling even as they maneuver over varying elevations.

This technique is particularly useful in rugged and uneven terrain, where terrain-following capabilities are crucial to avoid hazards while maintaining operational efficiency. In this context, altitude changes occur in relation to the terrain beneath, rather than as a method of controlling airspeed.