A LIFTING ARRANGEMENT AND METHOD FOR INSTALLING A COMPONENT OF A WIND TURBINE

A lifting arrangement for installing and uninstalling a component (16) of a wind turbine (15) is disclosed. The lifting arrangement comprises main yoke (1) being configured to be attached to a main crane (25), and a hoisting mechanism (2, 11) attached to the main yoke (1). The hoisting mechanism (2, 11) is configured to have a component (16) to be installed or uninstalled attached thereto and to move the component (16) relative to the main yoke (1). At least one connecting part (12) is each configured to establish a pretensioned connection between the main yoke (1) and a nacelle (14) of the wind turbine (15). The pretension of the at least one connecting part (12) is provided by operating a main crane (25) having the main yoke (1) attached thereto. Methods for installing and uninstalling a component (16) in a nacelle (14), using the lifting arrangement, are also disclosed.