Today’s wind farms,especially when located offshore,are a big investment for involved stake holders.Thus all important measures for ensuring quality should be carried out in order to protect these investments.Improper manufacturing of components can be a root cause of later costs for repairs during operation phase.These costs will be very high due to great effort for disassembly,special equipment (cranes,ships),specialized personnel and the nonproductive time of the turbine.Thus it is recommended to minimize this risk in a very early project stage while all components are accessible,easy to survey and if necessary to repair.