During an urban delivery flight, a propeller blade separated from the Unmanned Aircraft (UA). This caused severe vibrations and the subsequent failure of an electric motor which in turn triggered the onboard Flight Termination System and emergency parachute deployment. The UA impacted the ground, resulting in minor damage to the UA. The propeller blade that had separated struck an individual on the ground causing a minor injury. The Investigation determined that the probable cause of the accident was a fatigue fracture of a bolt securing the propeller blade, which caused the blade to separate from the UA.
