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1.1.1 This DNV GL Standard provides principles, technical requirements and guidance for extending the lifetime of wind turbines onshore and offshore. When designing wind turbines, a design lifetime of 20 years is generally assumed as a basis for dimensioning. Extension of lifetime for existing wind turbines can be justifiable from both a technical and an economic point of view. 1.1.2 This standard shall be used as a basis for the lifetime extension of wind turbines. 1.1.3 This standard focusses on technical issues in order to ensure a safe operation of the wind turbine when exceeding the original design lifetime. 1.1.4 This standard may also be applied for answering specific questions concerning a continuation of operation of wind turbines during their design lifetime. For example, this is the case for a wind turbine that is relocated to a new site or for a turbine where the site conditions have changed.