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When the gear was selected down it did not fully extend and the gear circuit breaker tripped. Initially the circuit breaker could not be reset nor could the gear be lowered using the emergency system. The circuit breaker was subsequently reset and a gear down indication obtained. Shortly after touchdown the aircraft yawed until it was travelling backwards. The tailskid struck the runway and the aircraft came to rest after turning through a further 90 degrees. The right main wheel was found to have turned through 90 degrees because the scissor linkage arms had become disconnected. A castellated nut and its retaining split pin was found to be missing from the bolt which joins the scissor linkage arms. The reason for the loss of these items could not be positively established.

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General details
Date: 19 March 1985 Investigation status: Completed 
Time: 1615 (approx)  
Location:Coffs Harbour Investigation type: Occurrence Investigation 
State: New South Wales Occurrence type: Loss of control 
Release date: 27 May 1985 Occurrence class: Operational 
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: PA-30 
Aircraft registration: VH-RBT 
Type of operation: Charter 
Damage to aircraft: Substantial 
Departure point:Tyagarah NSW
Departure time:1615 (approx)
Destination:Coffs Harbour NSW
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