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The pilot reported he was cruising at 300 feet over sand dunes when there was a loud bang, accompanied by a sudden loss of engine power. He immediately lowered the nose to maintain 40 knots and selected the only suitable landing area, which had a downwind component of about seven knots. Touchdown was normal but, during the landing roll, the nosewheel dug into soft sand causing the nose to drop and the gyrocopter to roll to the left, allowing the rotor to strike the ground. Examination of the two cylinder engine revealed that a stud holding the rocker gear to one cylinder head had failed, liberating the rocker gear to that cylinder. The engine manufacturer has indicated that the stud was an early design that has since been modified to eliminate the problem.

Download Final Report
[ Download PDF: 22KB]
General details
Date: 15 July 1990 Investigation status: Completed 
Time: 1040  
Location:2 km south of Redhead Investigation type: Occurrence Investigation 
State: New South Wales  
Release date: 09 May 1991  
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Bensen Aircraft Corporation 
Aircraft model: Benson B8M 
Aircraft registration: NG 697 
Type of operation: Private 
Damage to aircraft: Substantial 
Departure point:Cooranbong NSW
Departure time:1000
Destination:Cooranbong NSW
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Last update 11 March 2016