What condition defines a crosswind?

A crosswind is defined as wind that is not parallel to the aircraft’s path. This means that the wind is coming from a direction that is perpendicular or at an angle to the runways or flight path of the aircraft. Crosswinds can significantly affect the handling and control of the aircraft, especially during takeoff and landing phases.

In the context of flight operations, understanding wind direction and speed is crucial for pilots, as crosswinds require specific techniques for takeoffs and landings to maintain control and ensure safety. A wind that is parallel to the aircraft's path would not be classified as a crosswind, as it would exert no sideward force on the aircraft, allowing for more straightforward flight operations. Thus, recognizing that a crosswind implies an angle of approach relative to the aircraft's trajectory is essential in aviation.