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The American Bonanza Society is aware of six recent cases of failure of the swaged end of flight control cables at the turnbuckles in Beech piston airplanes. Four were in aileron control cables, one in an elevator control cable, and one in a rudder control cable. Two of these cases are currently under investigation by the U.S. National Transportation Safety Board. Failure of a control cable connection at the turnbuckle will result in loss of use of the associated control surface(s) and probable loss of control of the aircraft in flight. NOTE: This condition is not related to the control cable failures that were subject of an Australian (CASA) Airworthiness Directive in 2012.