Aviation safety investigations & reports

Engineering examination - cracked McCauley D3A34C404-C propeller hub, Canberra ACT, 4 March 2010

Investigation number:
Status: Completed
Investigation completed


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A McCauley Propeller Systems propeller hub with an area of transverse cracking extending through the hub mounting boss was received by the Australian Transport Safety Bureau (ATSB) from the Civil Aviation Safety Authority (CASA). CASA requested assistance from the ATSB to conduct an engineering examination of the cracked region.

The examination determined that the crack was the product of a high-cycle, low-stress fatigue mechanism, with the crack origin centred on a mounting stud hole. There were no associated defects or other anomalous features that may have assisted in the crack initiation.



Released in accordance with section 25 of the Transport Safety Investigation Act 2003.

Download Final Report
[Download  PDF: 707KB]
General details
Date: 04 March 2010   Investigation status: Completed  
Time: ESDT   Investigation level: Systemic - click for an explanation of investigation levels  
Location   (show map): Canberra    
State: Australian Capital Territory   Occurrence type: Engine failure or malfunction  
Release date: 16 November 2010   Occurrence category: Incident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Cessna  
Aircraft model U206G  
Last update 03 April 2020