be conveyed in the pylon 10 to the pod 6 at the tip thereof if for example repair or maintenance operations have to be carried out there the landing stage 20 a in relation to a prevailing wind direction at the location of the wind power installation 2 is disposed at the lee side thereof and is securely fixed there as described in that way the force of wind and sea swell both against the landing area 25 and also against the mooring location 28 is broken by the pylon when wind is blowing from the prevailing direction safe take offs and landings of helicopters 26 on the landing area 25 are guaranteed by a sufficiently large vertical distance between the landing area 25 and the diameter described by the tips of the rotor blades 4 referring now to fig1 the wind power installation 2 has a landing stage 20 b which differs from the landing stage 20 a in fig2 by the features described hereinafter the landing stage 20 b shown in fig1 is a steel plate steel framework structure whose concrete platform 22 is supported on a pontoon 36 disposed in the interior of the pontoon 36 are storage spaces not shown the platform 22 whose top side as already described with reference to fig2 forms the landing area 25 for helicopters 26 and whose lateral edges form the mooring location 28 for ships 30 is therefore not fixedly anchored in the sea on.