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.
Sheldon is a city in O'Brien and Sioux Counties in the U.S. state of Iowa, along the Floyd River. The population was 4,914 at the 2000 census; it is the largest city in O'Brien County.