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On August 17 2012 Jabiru issued JSB 033-1. The subject is Piston Circlips. There are two types of circlips: type A and type B imentioned. The type A can cause engine damage and have been installed in some engines. The serial #s of the affected engines and a piston kit with invoice dates 10-Oct 2011 to 28 June 2012 are listed on the 1st page on the service bulletin. The affected engines have to be disassembled and type A clips replaced w/ Type B clips.