By Don BrooksAs seen in the April 1999 Model Aviation.Illustration drawn by Tom Chipley; photos provided by the authorFor every unusual or unexpected event—flight accident, if you will—there is a root cause. The objective of the investigation for a crash is to identify the cause of that crash, and by learning this, be able to prevent future crashes that might spring from that same cause. According to an August 1987 Nuclear News article on failure analysis, all root causes fall into three categories: equipment failure, procedural error, or personnel error. Equipment failure could be…