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Aircraft accidents are a tragic thing however many people may argue that all are avoidable. When considering that all are avoidable, one must always remember there is an element that is in all accidents, Humans. Humans are involved in every aspect of flight such as, design, maintenance and as mentioned earlier piloted by. As long as humans are in 100% control of an airplane there will be accidents. However, a good side to an accident is it is thoroughly investigated and researched by the NTSB. (National Transportation and Safety Board). From a majority of the accidents, something can benefit aviation in general such as re-design, increased/specialized training, or as in this situation, re-evaluating current limitations to a safer level. The focus of my project is going to be on a particular accident that took place on July 19, 1989 when a McDonnell Douglas DC-10-10 (Ref fig 1) aircraft crashed in Sioux City, Iowa. Not only the accident and why it happened but to delve into the root cause of the accident, the failure of the number two engine and why it happened. This particular type of aircraft, at the time of the accident, had been in production for about 18 years. The United Airlines jet was bound for Chicago when the ta