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The pilot took off to the west and climbed straight ahead for approximately one kilometre. At about 150 feet above the ground the complete main rotor assembly suddenly separated from the gyroplane. The gyroplane then plummeted to the ground. The main rotor assembly struck the ground about 15 metres short of the main impact site. Wreckage examination disclosed that the lower teeter stop plate was bent on both ends, probably prior to the accident. The bent teeter stops allowed the main rotor blades to flap down beyond normal limits. All teeter stops had pronounced marks indicating repetitive contact. While the main rotor was spinning, one of the blade grips and one of its blade attachment bolts contacted the prerotator horn causing overload failure of the torque tube at the hole for the main rotor assembly attachment bolt. An imprint on one side of the torque tube indicated that full aft control stick had been applied at the time the torque tube began to fail.

None of the witnesses saw the gyroplane porpoising or performing unusual manoeuvres before rotor separation.

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[ Download PDF: 22KB]
General details
Date: 03 November 1990 Investigation status: Completed 
Time: 845  
Location:Bridgewater Investigation type: Occurrence Investigation 
State: Victoria  
Release date: 12 June 1991  
Report status: Final Occurrence category: Accident 
 Highest injury level: Fatal 
Aircraft details
Aircraft manufacturer: Unknown 
Aircraft model: Homebuilt Gyroplane 
Aircraft registration: Not registered 
Serial number: Nil 
Type of operation: Private 
Damage to aircraft: Destroyed 
Departure point:Bridgewater VIC
Departure time:0844
Destination:Bridgewater VIC
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Last update 18 March 2016