Aviation safety investigations & reports

Hughes Lightwing LW-02, 25-0081, Oakdale NSW, 25 February 1989

Investigation number:
Status: Completed
Investigation completed


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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.    
Location: Oakdale    
State: New South Wales    
Release date: 22 February 1990   Occurrence category: Accident  
Report status: Final   Highest injury level: None  

Aircraft details

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