When selecting a runway for helicopter takeoff or landing, use the runway most nearly aligned with the wind when the wind speed is at least how many knots?

• A. 5 knots or more
• B. 10 knots or more
• C. 15 knots or more
• D. 0 knots

Answer: (A)

Aligning the takeoff or landing runway with the wind takes advantage of a headwind component, which improves rotor efficiency, reduces the power needed, and lowers the ground speed during approach and takeoff. When the wind is five knots or more, that headwind component becomes meaningful enough to noticeably aid control and performance, so the runway most aligned with the wind should be used. If the wind is lighter than five knots, the benefit is smaller and other factors may play a larger role, but once you reach five knots, prioritizing wind alignment is the safer choice.