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As the helicopter was brought to a 20 foot hover, it began to swing to the right. The pilot applied left pedal but the rate of turn continued to increase rapidly until the helicopter impacted the ground. The right skid broke off and the aircraft came to rest on its right hand side. Examination of the tail rotor pitch control system revealed that the bolt which connects the tail rotor pitch control arm to the control rod, below the tail rotor gearbox, was missing. The bolt was never found and the reason for its absence could not be determined. It was evident that the loss of the bolt resulted in the loss of tail rotor control.

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General details
Date: 27 September 1983 Investigation status: Completed 
Time: 1320  
Location:31km NW of Koolotah Homestead Investigation type: Occurrence Investigation 
State: Queensland Occurrence type: Loss of control 
Release date: 26 September 1985 Occurrence class: Operational 
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Hughes Helicopters 
Aircraft model: 269 
Aircraft registration: VH-CHV 
Type of operation: Aerial Work 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:Koolatah QLD
Departure time:1320
Destination:Koolatah QLD
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Last update 13 May 2014