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Air Crash Investigations - Suddenly Falling Apart - The Crash of Lauda Air Flight 104 By Hank Williamson, Editor
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Lauda Air Flight NG 104, a Boeing 767-300 ER of Austrian nationality was on a scheduled passenger flight Hong Kong-Bangkok-Vienna, Austria. NG 004 departed Hong Kong Airport on May 26, 1991 , and... More > made an intermediate landing at Bangkok Airport. The flight departed Bangkok Airport at 1602 hours. The airplane disappeared from air traffic radar at 1617 hours about 94 nautical miles northwest of Bangkok. The probable cause of this accident is attributed to an un-commanded in-flight deployment of the left engine thrust reverser. All 223 people on board died in the accident.< Less
Air Crash Investigations - Why Did It Happen? - The Crash of Sikorsky S-76A Helicopter G-BJVX By Hank Williamson, Editor
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On March 23, 2004, about 1918:34 central standard time, an Era Aviation Sikorsky S-76A helicopter, N579EH, crashed into the Gulf of Mexico about 70 nautical miles south-southeast of Scholes... More > International Airport (GLS), Galveston, Texas. The helicopter was en route to the drilling ship Discoverer Spirit. The captain, copilot, and eight passengers aboard the helicopter were killed, and the helicopter was destroyed by impact forces. The flight was operating under the provisions of 14 Code of Federal Regulations Part 135 on a visual flight rules flight plan. Night visual meteorological conditions prevailed at the time of the accident. The National Transportation Safety Board determines that the probable cause of this accident was the flight crew’s failure to identify and arrest the helicopter’s descent for undetermined reasons, which resulted in controlled flight into terrain.< Less
Air Crash Investigations - Jammed Rudder Kills 132 - The Crash of USAir Flight 427 By Hank Williamson, Editor
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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... More > 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.< Less