For helos, no downwind landing authorized when tailwind is in excess of how many knots?

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Multiple Choice

For helos, no downwind landing authorized when tailwind is in excess of how many knots?

Tailwind during landing affects rotor lift and control near the ground. When the wind comes from behind, the rotor has less effective relative wind, reducing translational lift and making it harder to slow descent and land precisely. It also pushes the helicopter forward during the approach, reducing safety margin before touchdown. To keep landing operations safe, a five-knot tailwind limit is used for downwind landings. The other options are either more restrictive than needed or exceed safe margins: two knots would be unusually conservative, while eight or ten knots would significantly raise the risk of losing control or touching down with insufficient stopping distance.

Tailwind during landing affects rotor lift and control near the ground. When the wind comes from behind, the rotor has less effective relative wind, reducing translational lift and making it harder to slow descent and land precisely. It also pushes the helicopter forward during the approach, reducing safety margin before touchdown. To keep landing operations safe, a five-knot tailwind limit is used for downwind landings.

The other options are either more restrictive than needed or exceed safe margins: two knots would be unusually conservative, while eight or ten knots would significantly raise the risk of losing control or touching down with insufficient stopping distance.

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