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N999UA accident description

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Crash location Unknown
Nearest city Colorado Spgs, CO
38.833882°N, 104.821363°W
Tail number N999UA
Accident date 03 Mar 1991
Aircraft type Boeing 737-291
Additional details: None

NTSB Probable Cause

A loss of control of the airplane resulting from the movement of the rudder surface to its blowdown limit. The rudder surface most likely deflected in a direction opposite to that commanded by the pilots as a result of a jam of the main rudder power control unit servo valve secondary slide to the servo valve housing offset from its neutral position and overtravel of the primary slide.

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