Summary
On March 03, 1991, a Boeing 737-291 (N999UA) was involved in an accident near Colorado Spgs, CO. The accident resulted in 25 fatal injuries. The aircraft was destroyed.
The National Transportation Safety Board determined the probable cause of this accident to be: 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.
This accident is documented in NTSB report DCA91MA023. AviatorDB cross-references NTSB investigation data with FAA registry records to provide comprehensive safety information for aircraft N999UA.
Accident Details
Probable Cause and Findings
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.
Aircraft Information
Registered Owner (Historical)
Data Source
Data provided by the National Transportation Safety Board (NTSB). For more information on this event, visit the NTSB Records Search website. NTSB# DCA91MA023