Cases involving individuals who have been injured in crashes and collisions involving helicopters. A Helicopter Accident is an occurrence associated with the operation of an aircraft which takes place between the time any person boards the helicopter with the intention of flight and all such persons have disembarked, in which a person is fatally or seriously injured, the aircraft sustains damage or structural failure and/or the aircraft is missing or is completely inaccessible.
Natrona is an unincorporated community in central Natrona County, Wyoming, United States. It lies along the concurrent U.S. Routes 20 and 26, west of the city of Casper, the county seat of Natrona County. Its elevation is 5,604 feet (1,708 m), and it is located at 43°1′47″N 106°48′33″W / 43.02972°N 106.80917°W / 43.02972; -106.80917 (43.0296874, -106.8092162). Although Natrona is unincorporated, it has a post office, with the ZIP code of 82646.