Aviation safety investigations & reports

Homebuilt Gyroplane, Bridgewater VIC, 3 November 1990

Investigation number:
199001179
Status: Completed
Investigation completed

Summary

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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.

Download Final Report
[Download  PDF: 22KB]
 
 
 
General details
Date: 03 November 1990   Investigation status: Completed  
Time: 845    
Location: Bridgewater    
State: Victoria    
Release date: 12 June 1991   Occurrence category: Accident  
Report status: Final   Highest injury level: Fatal  

Aircraft details

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  
Last update 18 March 2016