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Flight 427 It took five years for investigators to determine the cause of the 1994 USAir crash outside Pittsburgh. Bill Adair has written a book about the investigation. The Mystery of Flight 427: Inside a Crash Investigation details the difficulty officials had in finding the cause and lists some of the theories they explored before finding fault with the plane's rudder. (5:45) The book is published by Smithsonian, April 2002.

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Flight 427

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Flight 427

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It took five years for investigators to determine the cause of the 1994 USAir crash outside Pittsburgh. Bill Adair has written a book about the investigation. The Mystery of Flight 427: Inside a Crash Investigation details the difficulty officials had in finding the cause and lists some of the theories they explored before finding fault with the plane's rudder. (5:45) The book is published by Smithsonian, April 2002.