USAir Flight 427 Accident Investigation
The NTSB final report on the 8 September 1994 accident involving a USAir 737 included conclusions and recommendations that also applied to a fatal 1991 accident involving a United Airlines 737 and an incident involving an Eastwinds 737.
The National Transportation Safety Board determined that the probable cause of the accident was a loss of control of the airplane resulting from the movement of the rudder surface to its blowdown limit, and that the rudder surface most likely deflected in a direction opposite to that commanded by the pilots as a result of a malfunction of the main rudder power control unit. More information is available from the NTSB accident report
Other Information
737 plane crashes
Fatal events for selected airlines
More about this event
http://airsafe.com/events/flt427.htm -- Revised: 4 October 2014