The operation was to install wear bushing using one stand of 5” HWDP. One stand of 5” HWDP stand was transferred to the hydraulic elevator by STV( Stand Transfer Vehicle). After that, the derrick man retracted the arm of STV out of the well centre to the monkey board side and connecting wear bushing Running Tool (R/T), the driller started to RIH when he suddenly noticed indication of weight slack off. He stopped to check and found that hydraulic elevator did hit the STV ( untracked accidentally without control) resulting in a bend of diving board & sheared two lock screw bars,3 pins dropped on the rig floor. Each weight= 387g height is 26 m. Nobody was standing in the red zone.