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At the end of a 180 deg turn the pilot attempted to level out but there was no cyclic response. The helicopter continued in the turn and the application of back cyclic could not prevent the nose dropping. The helicopter struck the bank of a creek shearing off the tail boom, main rotor and gearbox and came to rest in the water. The pilot escaped unhurt and unaided from the partially submerged cockpit. Investigation revealed that a bolt which secured a foot of the cyclic control wobble plate pylon to the transmission gearbox had become detached. Subsequent movement of the pylon deprived the pilot of effective cyclic control. The reason for the loss of the bolt could not be established.

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[ Download PDF: 22KB]
General details
Date: 05 February 1984 Investigation status: Completed 
Time: 920  
Location:8 km SE of Beaudesert Investigation type: Occurrence Investigation 
State: Queensland  
Release date: 05 March 1985  
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Hiller Aviation 
Aircraft model: UH-12 
Aircraft registration: VH-XRG 
Type of operation: Aerial Work 
Damage to aircraft: Substantial 
Departure point:8 km SE Beaudesert QLD
Departure time:0920
Destination:8 km SE of Beaudesert QLD
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Last update 01 April 2011