Crosswind Component

The crosswind component is the part of the wind that blows sideways across the runway rather than straight along it. It is found with a sine because the runway, wind direction, and wind vector form a right triangle, and the side-to-side component is opposite the angle between the wind and the runway. This value helps pilots judge whether the lateral wind load is within the aircraft’s demonstrated or approved landing and takeoff limits.

Use this when assessing runway choice, takeoff safety, or landing feasibility in windy conditions. It is especially useful when the wind is not aligned with the runway centerline and you need the sideways component acting on the aircraft.

• Using cosine instead of sine for the crosswind component
• Using the runway heading without finding the angle between the wind and the runway
• Forgetting that wind speed and component should be in the same units, usually knots