文档介绍：PB99-910401‘INATIONALTRANSPORTATIONSAFETYBOARDWASHINGTON, . 20594AIRCRAFT ACCIDENT REPORTUNCONTROLLED DESCENT AND COLLISION WITH TERRAINUSAIR FLIGHT 427BOEING 737-300, N513AUNEAR ALIQUIPPA, PENNSYLVANIASEPTEMBER 8, 1994NTSB/AAR-99/01DCA94MA0766472AThe National Transportation Safety Board is an independent Federal Agencydedicated to promoting aviation, raiload, highway, marine, pipeline, and hazardousmaterials safety. Established in 1967, the agency is mandated by Congress through theIndependent Safety Board Act of 1974 to investigate transportation accidents, studytransportation safety issues, and evaluate the safety effectiveness of government agenciesinvolved in transportation. The Safety Board makes public its actions and decisionsthrough accident reports, safety studies, special investigation reports, mendations, and statistical publications are available in their entirety at /. Otherinformation about available publications may also be obtained from the Web site or bycontacting:National Transportation Safety BoardPublic Inquiries Section, RE-51490 L’Enfant Plaza, East, , . 20594Safety Board publications may be purchased, by individual copy or by subscription,from the National Technical Information Service. To purchase this publication, orderreport number PB99-910401 from:National Technical Information Service5285 Port Royal RoadSpringfield, Virginia 22161(800) 553-6847 or (703) 605-6000Abstract: This report explains the accident involving USAir flight 427, a Boeing737-300, which entered an uncontrolled descent and impacted terrain near Aliquippa,Pennsylvania, on September 8, 1994. Safety issues in the report focused on Boeing 737rudder malfunctions, including rudder reversals; the adequacy of the 737 rudder systemdesign; unusual attitude training for air carrier pilots; and flight data recorder mendations concerning these issues were addressed to the Federal ACCIDENT REPORTN