Incident Details
The helicopter was engaged in filming a cogeneration plant. During its operations, the aircraft orbited the plant three times. On the third orbit, the helicopter passed directly over the plant's exhaust chimney, which was actively operating at the time. There was no visible indication that exhaust gases were emanating from the chimney. Subsequent reports indicated that the gases had a temperature of 350 degrees Fahrenheit and an oxygen content of 3.6 percent.
Events
As the helicopter passed over the center of the chimney, its turboshaft engine lost power. The pilot immediately initiated an autorotation, directing the aircraft towards an open area in a parking lot. During the flare maneuver, the helicopter struck a parked vehicle. The impact resulted in a hard landing that severed the tailboom and caused the helicopter to roll onto its side.
Certification Context
The certification standard for the engine's operating environment specified a maximum temperature of 120 degrees Fahrenheit. The temperature of the exhaust gases encountered was significantly higher than this standard.
Aftermath
The helicopter sustained substantial damage, including the severed tailboom and rollover. The vehicle that was struck also sustained damage. No further details about occupants or injuries are available from the source.