Aviation safety investigations & reports

Cessna A185F, VH-UJT, Orange NSW, 15 October 1988

Investigation number:
Status: Completed
Investigation completed


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At the start of the take-off run, one propeller blade separated from the hub. The resulting propeller imbalance caused damage to the engine and airframe. The fracture was caused by the growth of a fatigue crack from the second blade retention thread. No material abnormalities or stress concentrators contributed to fatigue initiation. It was estimated that fatigue growth had occurred over a period of approximately 2100 take-off/landing cycles. The Civil Aviation Authority subsequently amended the Airworthiness Directives relating to this type of McCauley propeller, when fitted to agricultural aircraft. These amendments include a reduction in hours between overhauls, and more detailed inspections of the threaded section of the blades.

Download Final Report
[Download  PDF: 22KB]
General details
Date: 15 October 1988   Investigation status: Completed  
Time: 1530    
Location: Orange    
State: New South Wales   Occurrence type: Propeller/rotor malfunction  
Release date: 19 June 1989   Occurrence category: Accident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Cessna Aircraft Company  
Aircraft model 185  
Aircraft registration VH-UJT  
Serial number 18503282  
Type of operation Aerial Work  
Damage to aircraft Substantial  
Departure point Orange NSW  
Departure time N/A  
Destination "Charmaine", Orange NSW