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This DNV GL standard provides principles, technical requirements and guidance for design and manufacturing of machinery components and structures for wind turbines onshore and offshore in order to maintain safety and function in ultimate and serviceability limit states. The present DNV GL standard can be applied as part of the technical basis for carrying out a DNV GL certification of wind turbines according to the DNV GL service specifications DNVGL-SE-0441, DNVGL-SE0190, DNVGL-SE-0073 and DNVGL-SE-0074. The basis for the machinery standard is the safe life design method. The damage tolerant design approach is not considered within this standard. Guidance note: The present DNV GL standard will cover the technical requirements to be applied for the DNV GL certification schemes and it is also intended to cover the requirements implied when using IEC 61400-22 related certification schemes. ---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e--- The objectives of this standard are to: — provide an internationally acceptable level of safety by defining minimum requirements for machinery components and structures in wind turbines (in combination with referenced standards, recommended practices, guidelines, etc.). — serve as design basis for designers, suppliers, purchasers and regulators. — specify requirements for wind turbines subject to DNV GL certification.