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A
The helicopter should always land into wind.
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B
The helicopter is preferred to land parallel to the swell.
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C
The helicopter should always land perpendicular to the waves.
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D
The decision about the landing direction should be made shortly before the ditching so that possible changes in the wind direction will be considered.
Ditching a helicopter into the sea, a river, or a lake, is a controlled manoeuvre that, by definition, cannot be practiced and may be extremely hazardous. It is only contemplated when no other realistic option remains in an emergency.
It may be in the case that there is an engine failure because of a growing fire onboard followed by autorotation, a control failure (tail rotor) and/or it is not possible to reach a runway/heliport, or a suitable landing site.
The actions following a successful ditching vary on the environment, helicopter flotation equipment and survival equipment available.
Ditching into wind may be the checklist recommendation, but it is also likely that swell direction should be considered. If there is a particularly large swell, it may be that a crosswind becomes acceptable, but landing parallel to the swell with crosswind may be the preferred option.
Either way, the aim is to touch down at the lowest possible forward airspeed, avoiding any backwards movement.
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