Most of the Mini 500 crashes were engine related to the rotax engine installed that rotax stated not to run a particular rpm range due to a possible sudden stopage. The Mini 500 rrpm makes the engine rpm in the red band for that engine, and therefore many sudden stopages and subsequent crashes. Of the other crashes that I have read about they were mainly attributed to inexperiance pilots, or substituting unapproved componets inplace of what the manufacturer sugests.