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During a maintenance investigation for an oil leak on the aircraft's Jabiru 2200cc engine, it was discovered that two flywheel-to-crankshaft retention cap screws had failed. The remaining four retention cap screws also showed signs of impending failure. The engine had operated for approximately 226 hours. The operator had previously experienced a complete failure of all six retention cap screws, during start-up, on another 2200cc engine that was fitted to this aircraft. This failure occurred at approximately 274 engine hours. The operator had also experienced problems with cracking of the engine rocker assemblies. Although the aircraft was operated under Australian Ultralight Federation (AUF) requirements, the aircraft type was certificated to operate as an Australian registered aircraft. However, the Jabiru 2200cc and 1600cc series engine types had not been certificated, but were accepted for use in Australia under the auspices of CAO 101.55. This aircraft was one of the first to be fitted with the Jabiru 2200cc series engine. SAFETY ACTION As a result of this occurrence, technical personnel from the Bureau of Air Safety Investigation met with CASA to discuss the Jabiru engine certification issue, and the flywheel cap screw failures. CASA advised that both the Jabiru 1600cc and 2200cc engines were currently undergoing certification. The Jabiru 2200cc engine is to comply with JAR 22H. CASA indicated that they will consider the Jabiru engine flywheel retention cap screw failures as part of the certification process. The Bureau of Air Safety Investigation will continue monitoring the certification of the Jabiru 1600cc and 2200cc engines.
Download Final Report
[ Download PDF: 13KB]
General details
Date: 16 September 1997 Investigation status: Completed 
 Investigation type: Occurrence Investigation 
Release date: 26 May 1998 Occurrence class: Technical 
Report status: Final Occurrence category: Incident 
Aircraft details
Aircraft manufacturer: Jabiru Aircraft Pty Ltd 
Aircraft model: LSA 55/3J 
Aircraft registration: 55-1831 
Sector: Piston 
Damage to aircraft: Nil 
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Last update 28 October 2014