IMPROPER RIGGING OF 70# BEARING CAPS; FAILURE TO WAIT FOR SIGNALS; MISJUDGEMENT OF PROPER CLEARANCE; FAILURE TO CLEAR PERSONNEL BELOW. VICTIM FELT HE WAS IN A SECURE POSITION AND FAILED TO CON NECT TO PROVIDED SAFETY BLOCK. RESULTED IN DISLOCATED RIGHT ELBOW, SCALP LACERATION, POSSIBLE RIB FRACTURES, ABRASIONS AND CONTUSIONS. HOSPITALIZED.