Aviation safety investigations & reports

Total power loss Benson B8M, NG 697, 2 km south of Redhead NSW, 15 July 1990

Investigation number:
Status: Completed
Investigation completed


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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    
State: New South Wales    
Release date: 09 May 1991   Occurrence category: Accident  
Report status: Final   Highest injury level: None  

Aircraft details

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  
Last update 11 March 2016