Air Crash Investigation - S04E05 Hidden Danger (United Airlines Flight 585, USAir Flight 427 and Eas

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Air Crash Investigation - S04E05 Hidden Danger (United Airlines Flight 585, USAir Flight 427 and Eastwind Airlines Flight 517)
On 3 March 1991, United Airlines Flight 585's rudder failed and the aircraft crashed within 8 seconds, killing 25 people. On 8 September 1994, USAir Flight 427's rudder also failed, killing 132 people. On 9 June 1996, Eastwind Airlines Flight 517's rudder failed as well, but the crew successfully regained control of the aircraft and landed safely. The cause of all three incidents were the rudders doing a "hardover" and jamming due to thermal shock of the power control valve.

Type of aircraft: United Airlines Flight 585: Boeing 737-200, USAir Flight 427: Boeing 737-300, Eastwind Airlines Flight 517: Boeing 737-200.
Cause of disaster: Malfunction of power control units (PCUs) due to thermal shock.

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