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Yet for all these technical successes, and the overall standards of safety they have achieved, the art and science of advanced aeronautics and their associated techlogies are t yet perfected. This book examines incidents in which flying conditions were so adverse that accepted aviation wisdom was shown to be lacking. Nor has the complex relationship between techlogical progress and expertise on one hand, and human frailty on the other, been fully resolved. Based primarily on official investigation reports, supplemented by extensive external research, each of these accounts has been selected to exemplify the problems encountered, both operational and human.