Aviation safety investigations & reports

Cessna 182F, VH-TWM, Gilberland Mine, 105km South of Georgetown QLD, 22 December 1986

Investigation number:
Status: Completed
Investigation completed


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Shortly after lift-off, both propeller blades separated from the aircraft, which then touched down and subsequently overturned. One of the propeller blades was located 80 metres to the left of the strip and the other, with hub and constant speed unit attached, was located 40 metres to the right of the strip. The propeller hub contained a fracture which was caused by the propagation of a fatigue crack originating at the root of the blade retention thread. The engine had been fitted with two fifth order crankshaft damper weights. This was contrary to the manufacturer's requirement, which was for one fifth order and one sixth order counterweight to be fitted. It is considered likely that fitment of the incorrect counterweights initiated and contributed to the propagation of the fatigue crack.

Download Final Report
[Download  PDF: 22KB]
General details
Date: 22 December 1986   Investigation status: Completed  
Time: 1245    
Location: Gilberland Mine, 105km South of Georgetown    
State: Queensland   Occurrence type: Propeller/rotor malfunction  
Release date: 08 June 1988   Occurrence category: Accident  
Report status: Final   Highest injury level: Minor  

Aircraft details

Aircraft details
Aircraft manufacturer Cessna Aircraft Company  
Aircraft model 182  
Aircraft registration VH-TWM  
Type of operation Private  
Damage to aircraft Substantial  
Departure point Gilberland Mine QLD  
Departure time N/A  
Destination Mareeba QLD