A professional pilot was flying his helicopter over rough terrain when the turbine engine stopped and the helicopter crashed. The pilot survived the crash but injured his back. The facility that had last overhauled the engine claimed that it was the pilot who caused the crash by failing to check the oil level in...

An air ambulance helicopter crashed when one of the main rotor blades came apart in flight. The three-person crew was killed. The rotor blades were made of composite materials that were almost entirely consumed in the post-crash fire. Government investigators worked for more than a year but, with little evidence available, never determined why...