Crane Operator (CO), after positioning the crane in the jack, climbed on the ladder to access the boom operating cabin. CO stepped on the carrier @ 1.6 m and while attempting to enter the boom operating Cabin, and at the point of changing his hand grip between outside handhold rail to inside cabin handholding point, lost his balance and fell to the ground landing face down. Hospital report confirmed fracture of lower end of radius (right hand) & fracture of 2nd cervical vertebra