In the case of the Ustica accident involving an Itavia DC9, which is unique in the world, an anomalous procedure was followed whereby the judicial authority, which should have been responsible only for identifying the culprit, also had the task of determining the causes of the accident. The investigation would have been very different if it had been conducted by experienced aviation safety investigators who would certainly have been able to reach a firm conclusion on the causes of the accident. Read this book to learn how a proper aviation investigation should be conducted.