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===Control system mechanical failures===
In these incidents, there was a failure of control system components themselves (e.g. cables, hydraulics, flaps, slats, ailerons, rudder, stabilizer, trim tabs, auto-pilot).
*[[United Airlines Flight 585]], [[Boeing 737]], March 3, 1991. The hydraulic servo that controlled the rudder had an un-commanded actuation, resulting in a [[Boeing 737 rudder issues|"hardover"]] where the rudder unexpectedly reversed. All 20 passengers and 5 crew members were killed when the pilots were unable to regain control, and the aircraft slammed into the ground and exploded.
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