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The pilot had planned to carry out a bore-hole inspection on his property. During the start-up sequence the pilot noted that more choke than normal was required, however, after start-up the engine ran smoothly. Approximately 30 minutes after take off the pilot observed air bubbles flowing through the transparent fuel line. The engine began to run roughly and stopped. The pilot commenced forced landing procedures and attempted to restart the engine by hand priming the fuel system using the rubber manual priming bulb. The bulb, once compressed, did not return to its original size. The pilot was forced to carry out a forced landing on unsuitable terrain and the aircraft was damaged. The engine fuel pump non-return valve was found jammed in the open position by black rubber particles. These particles had come from the inside wall of the manual priming bulb. An open non-return valve will cause a loss of pressure within the fuel system and engine failure. The fuel tank is mounted well below the engine. Once the particles were removed from the fuel system the engine ran normally. The aircraft's history indicated that it had been left standing in hot and dry conditions for some time allowing the rubber priming bulb to dry out. Manual operation of the dry bulb probably caused internal cracking and allowed rubber particles to contaminate the fuel system.

Download Final Report
[ Download PDF: 23KB]
General details
Date: 24 November 1989 Investigation status: Completed 
Time: 1630  
Location:Beebyn Station Investigation type: Occurrence Investigation 
State: Western Australia  
Release date: 26 April 1990  
Report status: Final Occurrence category: Accident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Thruster Aircraft (Australia) Pty Ltd 
Aircraft model: Gemini Thruster 
Type of operation: Unknown 
Damage to aircraft: Substantial 
Departure point:Beebyn Station, WA
Departure time:1600
Destination:Beebyn Station, WA
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Last update 21 March 2016