Usair flight status tracker2/28/2023 ![]() The aircraft began to yaw and roll left, and the nose began to drop. Approximately three seconds after encountering the wake vortex, the accident aircraft’s rudder suddenly moved to a full-left position. ACCIDENT SUMMARYOn September 8, 1997, USAir Flight 427 was approaching the Pittsburgh International Airport at 6,000 feet and 190 knots when it encountered the wake vortices of a preceding Boeing 727. Instead, this submission concentrates on the actions of the flight crew and facts which establish that the flight crew did not cause the full-left rudder deflection, and that they acted properly in responding to this emergencyĪ. Similarly, this submission does not analyze the various possible rudder control system failure modes because the investigation of this issue is ongoing and modifications of that system already recommended by the Safety Board should protect against future accidents. This submission does not analyze possible accident causes that were investigated and found not to be a factor, for they are quite numerous and undisputed. In addition, US Airways has implemented procedures to deal with potential rudder control problems in the unlikely event they should occur. As a result, the Board has issued recommendations to correct problems that might exist in the Boeing 737 rudder control system. The investigation revealed that the Boeing 737 rudder control system has certain anomalies which may have resulted in a rudder reversal or uncommanded full rudder deflection on the accident aircraft. It is also clear that the wake vortex encounter did not directly cause the accident. The data demonstrates, and all parties seem to agree, that USAir Flight 427’s rudder moved to a full-left position shortly after the aircraft encountered wake vortices generated by a preceding aircraft. ![]() This extensive, three-year investigation has yielded a great deal of information and analysis. As the investigation is ongoing, US Airways reserves the right to supplement this submission. The purpose of this submission is to provide the National Transportation Safety Board with US Airways’ analysis and conclusions regarding the circumstances and causes of the crash of USAir Flight 427. FLIGHT CREW RESPONSE TO FULL-LEFT RUDDER DEFLECTION. ![]() Flight Crew Response to Full Left Rudder Deflection.NATIONAL TRANSPORTATION SAFETY BOARD USAIR FLIGHT 427 US AIRWAYS PARTY SUBMISSION OF US AIRWAYS, INC. ![]()
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