Bad maintenance practices at a Georgia air force base missed a deteriorating propeller blade that broke off six years later as a U.S. Marine Corps transport plane cruised over Mississippi at 20,000 feet, causing the KC-130T to break into pieces and plunge into a soybean field, killing 15 Marines and a Navy corpsman.
Investigators with Fourth Marine Aircraft Wing released the report Wednesday into the July 10, 2017 crash.
The report says the propeller blade broke off and slammed into the plane's fuselage, causing the U.S. Marine Corps KC-130T plane to crash into farmland near Itta Bena, Mississippi.
The investigation determined that the aircraft's propeller did not receive proper "depot-level maintenance" during its last overhaul in September 2011, which missed corrosion that may have contributed to the propeller blade breaking off in-flight. The report also says nothing the crew could have done would have prevented the crash.