Bell 407, DeLand, Fla., Jan. 7, 2008– A total loss of engine power due to the fatigue failure of a third-stage turbine wheel blade downed the single-engine helicopter, the NTSB determined. The 407–operating as an EMS transport– was nearing its patient pickup destination when the pilot reported hearing a loud bang, which was followed by a yaw to the left. The pilot also noted squealing metallic sounds along with the sounding of the Fadec warning horn, the low-rotor-rpm warning horn and the illumination of several warning lights, before he initiated an autorotation to an unfinished roadway.
A witness on the ground reported seeing a “big orange glow” and sparks emitting from the right side of the helicopter before it began its descent. Upon landing, the pilot and paramedic escaped the helicopter without injury. The helicopter was substantially damaged. The engine was removed and returned to the manufacturer for examination.
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