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The pilot reported that the helicopter was cruising normally at 2500 feet when there was a loud noise from the engine. He entered autorotation and landed but the helicopter rolled on its side on landing. Specialist examination of the engine revealed that the number four piston connecting rod failed as a result of fatigue cracking initiated by galling between the connecting rod and the crankshaft bearing. Galling is the deposition of metal from one surface on another when the two surfaces come into forceful contact. The galling was induced by continual overspeeding of the engine. Other connecting rods from the engine also showed evidence of galling.

Download Final Report
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General details
Date: 19 December 1990 Investigation status: Completed 
Time: 1100  
Location:10km NW Quirindi Investigation type: Occurrence Investigation 
State: New South Wales  
Release date: 02 March 1992  
Report status: Final Occurrence category: Accident 
 Highest injury level: Minor 
Aircraft details
Aircraft manufacturer: Hiller Aviation 
Aircraft model: UH-12 
Aircraft registration: VH-FBQ 
Serial number: 5092 
Type of operation: Private 
Damage to aircraft: Substantial 
Departure point:Merriwa NSW
Departure time:N/K
Destination:Caloundra QLD
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