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The pilot reported that the engine stopped in the cruise at about 600 ft. He entered autorotation and landed in low trees and scrub. The engine stopped because the crank shaft drive gear bolt failed due to hydrogen embrittlement. When the bolt failed drive to the accessories was lost. The manufacturer has verbally assured CASA that this was an isolated instance of a bolt failure.
Download Final Report
[ Download PDF: 14KB]
General details
Date: 04 April 1998 Investigation status: Completed 
Time: 13:45 EST  
 Investigation type: Occurrence Investigation 
 Occurrence type: Forced/precautionary landing 
Release date: 24 June 1998  
Report status: Final Occurrence category: Accident 
Aircraft details
Aircraft manufacturer: Robinson Helicopter Co 
Aircraft model: R44 
Aircraft registration: VH-OCT 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:Lilydale Vic.
Destination:Hobart Tas.
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Last update 28 October 2014