Title: AIR CRASH INVESTIGATIONS: JAMMED RUDDER KILLS 132, The Crash of USAir Flight 427
Publisher: Lulu Press, Inc.
Publication Date: 2011
Language: English
ISBN 10: 1105131343
ISBN 13: 9781105131349
Binding: Soft cover
Condition: New

About this title

Synopsis

The Boeing 737 has a history of rudder system-related anomalies, including numerous instances of jamming. A number of accidents and incidents were the result of the airplanes' unexpected movement of their rudders. During the course of the four and a half year investigation of the crash of USAir Flight 427 near Aliquippa, Pennsylvania, killing 132 people, the NTSB discovered that the PCU's dual servo valve could jam as well as deflect the rudder in the opposite direction of the pilots' input, due to thermal shock, caused when cold PCUs are injected with hot hydraulic fluid. This finally solved the mystery of sudden jamming of the rudders of this aircraft.

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