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During agricultural operations, one propeller blade moved to coarse pitch while the aircraft was flying at a height of 50 feet. Power was reduced, the load dumped and the pilot carried out a forced landing in a nearby paddock. Investigation revealed that one counterweight roller bearing shaft had failed in fatigue across the split-pin hole. The split-pin hole is drilled close to where the bearing shaft exits the hub flange. The hub has now been modified to locate the split-pin in the threaded section at the opposite end of the shaft.
Download Final Report
[ Download PDF: 12KB]
General details
Date: 19 March 1993 Investigation status: Completed 
Time: 8:00 EST  
 Investigation type: Occurrence Investigation 
 Occurrence type: Propeller/rotor malfunction 
Release date: 30 August 1993 Occurrence class: Technical 
Report status: Final Occurrence category: Incident 
Aircraft details
Aircraft manufacturer: Air Tractor Inc 
Aircraft model: AT-301 
Aircraft registration: VH-JFA 
Sector: Piston 
Damage to aircraft: Nil 
Departure point:Coleambally NSW
Destination:Griffith NSW
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Last update 23 July 2015