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The original propeller fitted to the aircraft had been damaged in a landing mishap, and the owner/pilot ordered a replacement from the aircraft manufacturer. The new propeller was of different dimensions and weight to the original, and the owner sought and obtained the manufacturer's assurance that it was suitable for the aircraft type. A number of static and taxy trials were completed without problem. However, on the first take-off, the aircraft had reached a height of about 50 feet when the propeller failed. The aircraft pitched down and struck the ground. A subsequent examination of the propeller revealed that it had failed as a result of the applied centrifugal forces. It had been constructed in four laminations, using two types of wood. One lamination contained a large knot in the hub area, and it was probable that another lamination was affected by brittleheart. This weakness is characterised by minute compression failures in the walls of the fibres, induced by growth stresses in the particular tree. When the propeller failed the aircraft was at a critical stage of flight, and stalled. There was insufficient height available for the pilot to regain control before impact with the ground.

Download Final Report
[ Download PDF: 22KB]
 
 
 
 
General details
Date: 06 October 1985 Investigation status: Completed 
Time: N/A Investigation type: Occurrence Investigation 
Location:Henty Occurrence type:Propeller/rotor malfunction 
State: New South Wales Occurrence class: Technical 
Release date: 26 June 1986 Occurrence category: Accident 
Report status: Final Highest injury level: Serious 
 
Aircraft details
Aircraft manufacturer: Skycraft Pty Ltd 
Aircraft model: Skycraft Scout Mk 3 
Aircraft registration: Not registered 
Type of operation: Sports Aviation 
Damage to aircraft: Substantial 
Departure point:Henty NSW
Departure time:N/A
Destination:Henty NSW
 
 
 
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Last update 18 May 2016