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The pilot reported that while cruising at about 600 ft AGL, he heard a loud noise and the helicopter shook violently. He initiated autorotation and helicopter landed heavily a short time later. Both occupants escaped with minor injuries. Subsequent investigation revealed that the transmission torsion coupling had broken, and two steel back up pins had sheared. The transmission failure had caused complete loss of torque to the main rotor. The tail rotor and gear box showed no evidence of pre -impact damage.
Download Final Report
[ Download PDF: 14KB]
General details
Date: 12 December 1997 Investigation status: Completed 
Time: 9:30 EST  
 Investigation type: Occurrence Investigation 
 Occurrence type: Transmission and gearbox 
Release date: 09 February 1998 Occurrence class: Technical 
Report status: Final Occurrence category: Accident 
 Highest injury level: Minor 
Aircraft details
Aircraft manufacturer: Hiller Aviation 
Aircraft model: UH-12E 
Aircraft registration: VH-FBV 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:Melrose Station Qld
Destination:Melrose Station Qld
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Last update 28 October 2014