Removable functional module for a wind turbine and method of coupling a functional module to a wind turbine

A method of coupling a functional module to a wind turbine, the method comprising:

• detachably fastening the functional module to the wind turbine in a predetermined position by means of a fastening element, wherein the functional module is removable from the predetermined position, when the fastening element is unfastened;
• wherein the wind turbine comprises a cover configured to form part of a housing of the wind turbine, when the functional module is in the predetermined position;
• wherein the functional module is configured to carry out a function contributing to the operation of the wind turbine, when the functional module is in the predetermined position;
• wherein the cover is configured to cover an opening in the housing, when the functional module is in the predetermined position;
• wherein the functional module comprises a fluid conduit configured to transport a fluid to or from parts of the functional module or of the wind turbine, and a fluid opening arranged to a side of the functional module and connected to the fluid conduit;
• wherein the fluid opening is positioned adjacent to a corresponding fluid opening in the housing, when the functional module is arranged in the predetermined position.