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The pilot intended to conduct a practice aerobatic flight, and had arranged for an observer on the ground to monitor and assess his performance. The planned sequence was commenced, but the observer noted that the second manoeuvre was not completed satisfactorily, and the aircraft apparently stalled while inverted. After recovering from this situation, further manoeuvres were carried out. Other witnesses suggested that the entries to some of these manoeuvres were performed at higher "G" loadings than normal. The aircraft subsequently entered a spiral dive, which was continued without any apparent effort being made to effect recovery. The aircraft maintained the spiral until it collided with power lines, then impacted the ground. A fierce fire broke out and consumed the wreckage. A detailed investigation failed to discover any defect or malfunction with the aircraft or its systems which might have contributed to the accident. The pilot had been in current practice for aerobatic flight, and there was no evidence of any physical illness or incapacity which might have affected his ability to control the aircraft. However, it was evident that the aircraft was not under control during the spiral dive. It was considered possible that the pilot might have lost consciousness as a result of either a rapid increase in "G", or sustained high "G" loads applied during the preceding aerobatic sequence.

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General details
Date: 08 March 1987 Investigation status: Completed 
Time: 1620  
Location:Schofields Investigation type: Occurrence Investigation 
State: New South Wales Occurrence type: Loss of control 
Release date: 05 November 1987 Occurrence class: Operational 
Report status: Final Occurrence category: Accident 
 Highest injury level: Fatal 
Aircraft details
Aircraft manufacturer: Bellanca Aircraft Corp 
Aircraft model: 8 
Aircraft registration: VH-SFK 
Serial number: 579-80 
Type of operation: Private 
Damage to aircraft: Destroyed 
Departure point:Schofields NSW
Departure time:1620
Destination:Schofields NSW
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