This standard is intended to apply to wind turbine gearboxes. It provides information for specifying@ selecting@ designing@ manufacturing@ procuring operating and manufacturing reliable speed increasing gearboxes for wind turbine generator system service. Annex information is supplied on: wind turbine architecture@ wind turbine load description@ quality assurance@ operation and maintenance@ minimum purchaser gearbox manufacturing ordering data@ lubrication selection andmonitoring@ determination of an application factor from a load spectrum using equivalent torque@ and bearing stress calculations.