A method of prolonging pitch bearing lifetime and pitch bearing

A method of prolonging pitch bearing lifetime for a wind turbine comprising a rotor, a nacelle, and a tower;

• said rotor comprising a hub and at least one pitch controlled wind turbine blade, said blade comprising a pitch bearing including an inner and an outer bearing ring, and pitch controlling means for pitching said blade by means of said bearing, wherein said inner bearing ring is mounted on said hub and said blade is mounted on and abuts said outer bearing ring,
• said method comprising the steps of:
• stopping said rotor from rotating;
• removing a plurality of first fastening means used for mounting said blade to said outer bearing ring;
• mounting a strengthening arc structure on said outer bearing ring, opposite the blade;
• installing a plurality of second fastening means, thereby connecting said blade and said strengthening arc structure to said outer bearing ring.