25 fatal · BOEING 737-291 · 1991-03-03 · COLORADO SPGS, CO, USA
Event
NTSB number
DCA91MA023
Event ID
20001212X16583
Type
Accident
Date
1991-03-03
Location
COLORADO SPGS, CO, USA
Injuries
Highest injury
FATL
Fatal
25
Serious
0
Minor
0
Uninjured
0
Total aboard
25
Aircraft
Make
BOEING
Model
737-291
Registration
N999UA
FAR Part
121
Engines
2
Damage
DEST
Conditions
Light
DAYL
Weather
VMC
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.