Aviation safety investigations & reports

Turbopropeller engine output shaft examination Allied-Signal (Honeywell) TPE331-12

Investigation number:
Status: Completed
Investigation completed


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A rigid propeller shaft (part number 3102572-2) from an Allied-Signal (Honeywell) TPE331-12 turboprop engine, was received and examined by the ATSB in order to characterise and assess the nature of an unusual and irregularly finished surface at the end of the forward main bearing/seal journal. The anomalous area had been originally identified during inspection by the engine maintenance provider, who subsequently referred the matter to the Civil Aviation Safety Authority (CASA) through their service difficulty reporting (SDR) system.

The ATSB laboratory examination identified the features associated with the ends of the journal surface as being characteristic of surfaces that had been manually dressed following the application of a plasma/metal sprayed coating to re-build the journal surfaces. Subsequent reference to the inspection/repair manual for the propeller shaft, confirmed that plasma spraying was an approved process for journal repair, and that hand-finishing and deburring was specified for post-spray dressing.

Download Final Report
[Download  PDF: 339KB]
General details
Date: 09 February 2006   Investigation status: Completed  
Location   (show map): Canberra Head Office    
State: Australian Capital Territory    
Release date: 10 July 2007   Occurrence category: Technical Analysis  
Report status: Final   Highest injury level: None  
Last update 18 April 2018