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About twelve minutes after departure and while cruising at 1200 feet above the ground the engine speed reduced from 5200 to 2000 rpm. This was accompanied by a mechanical knocking noise and severe vibration. The pilot immediately shut down the engine down to prevent possible damage . He carried out an emergency landing into the most favourable area within gliding distance. On touchdown the aircraft decelerated rapidly nosed over and came to rest inverted. It was not apparent from the air that the grass in the paddock was about half a metre high. The crankshaft had fractured at the centre pin between the bearing and the helical gear. The fracture was caused by fatigue attributed to extensive cracking. It was not possible to determine if the cracking had been present since manufacture or initiated from a propeller strike event some 60 hours prior to the failure when the engine was installed in a different aircraft. No log books are required for this type of engine hence the complete history of the engine could not be determined. This accident was not the subject of an on-scene investigation.

Download Final Report
[ Download PDF: 22KB]
 
 
 
 
General details
Date: 25 February 1989 Investigation status: Completed 
Time: 1615 Approx. Investigation type: Occurrence Investigation 
Location:Oakdale  
State: New South Wales  
Release date: 22 February 1990 Occurrence category: Accident 
Report status: Final Highest injury level: None 
 
Aircraft details
Aircraft manufacturer: Howard Hughes Engineering P/L 
Aircraft model: GA-55 
Aircraft registration: 25-0081 
Serial number: N/K 
Type of operation: Sports Aviation 
Damage to aircraft: Substantial 
Departure point:The Oaks NSW
Departure time:1600 Approx.
Destination:The Oaks NSW
 
 
 
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