Method and apparatus of performing maintenance on a wind turbine component

A method of performing maintenance on a wind turbine component of a wind turbine, the wind turbine including a tower, a nacelle, a hub, and at least one rotor blade, wherein the nacelle includes an integrated lifting apparatus having an extendible boom that forms a permanent part of the wind turbine, the method comprising:

• lifting a first temporary support using at least part of the integrated lifting apparatus;
• coupling a first end of the first temporary support to the nacelle or the hub and a second end of the first temporary support to the integrated lifting apparatus;
• removing the wind turbine component using at least part of the integrated lifting apparatus and the first temporary support in combination;
• installing a replacement wind turbine component using at least part of the integrated lifting apparatus and the first temporary support in combination;
• decoupling the first end of the first temporary support from the nacelle or the hub and the second end of the first temporary support from the integrated lifting apparatus;
• and
• removing the first temporary support from the wind turbine using at least part of the integrated lifting apparatus.