Aviation safety investigations & reports

Hughes lightwing, 25-225, Cooranbong NSW, 19 December 1989

Investigation number:
Status: Completed
Investigation completed


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The aircraft was being used for dual training and was operating in the circuit, having been airborne for about 45 minutes. During a turn onto the crosswind leg the engine partially lost power. The instructor immediately took control as the power was inadequate to maintian height and initiated a turn for landing on the reciprocal runway. On the approach, the aircraft struck trees bordering the edge of the strip and dived vertically to the ground. The instructor's seat attachment was damaged during the collision with the trees, prior to ground impact. Examination of the engine's spark plugs indicated the front cylinder had ceased to deliver power. The partial loss of power was the result of dirty fuel. Contamination was found in the float bowl of the front cylinder carburettor, in the fuel filter,and in the fuel line between the fuel tank and filter. The contaminated motor vehicle fuel was purchased from a nearby service station on the day prior to the accident. Two stroke oil was mixed with the fuel by the aircraft operator and not adequately filtered before being added to the aircraft fuel tanks.

Download Final Report
[Download  PDF: 23KB]
General details
Date: 19 December 1989   Investigation status: Completed  
Time: 845    
Location: Cooranbong    
State: New South Wales    
Release date: 09 August 1990   Occurrence category: Accident  
Report status: Final   Highest injury level: Serious  

Aircraft details

Aircraft details
Aircraft manufacturer Howard Hughes Engineering P/L  
Aircraft model GR-912  
Aircraft registration 25-0225  
Serial number N/k  
Type of operation Sports Aviation  
Damage to aircraft Destroyed  
Departure point Cooranbong NSW  
Departure time 0800  
Destination Cooranbong NSW