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The aim of maintenance is to achieve a high technical availability and a high wind power yield of the wind turbines at the lowest possible cost. Modern onshore wind turbines generally achieve an availability of 97 percent to 99 percent [ISET 2008]. Due to the special location situation and the associated challenges, such as loads and accessibility, offshore projects can generally be expected to have lower availability [Meer Wind Strom a]. Research and industry are jointly developing new methods and tools for optimized and responsive maintenance procedures with the aim of increasing plant availability and reducing maintenance and repair costs [Meer Wind Strom b]; [Wind-Pool].