What cranes are required to have certified operators? The new regulation applies to operators of boom trucks, mobile cranes, tower cranes and self erecting tower cranes. An exemption applies to cranes either under five tons or with a boom length less than 25 feet. Bridge cranes are not included in this regulation. Whar are the most common crane incidents? Common types of incidents are cranes contacting high voltage power lines, cranes tipping over, booms bending due to overloading, material falling due to improperly secured loads or rigging, structural failure of the crane itself and poor communication between the operator and site personnel causing an incident to occur.