There's a known fault that should have been corrected by now with the hydraulics that operated the rudders. Outs-side air-temperatures are around, minus-60-degrees C at 33,000 feet, while the hydraulic fluid can prove to be as hot as 300-degrees-C whilst in use & under-pressure.
At a certain altitude, the temperature differences can cause the hydraulic-ram to the rudder to seize, depending on the insulation used around the components, quality of the oil, & its contamination...
Lots of factors to consider here...And most of these 737 accidents in the past were on the landing cycle, not take-off...But the plane could have landed, refueled, had a passenger transfer etc, taken-off, & kerboom...
RIP those lost.
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"Only an alert & knowledgeable citizenry can compel the proper meshing of the huge industrial & military machinery of defense with our peaceful methods & goals, so that security & liberty may prosper together". Dwight D.Eisenhower.
Darn Brother your an aero nutical engineer! hehe Good points not kidding now. It does get cold! I flew private planes, parachuted and I can remember sweating on the ground and icing at 12.500 feet below 32
"Only an alert & knowledgeable citizenry can compel the proper meshing of the huge industrial & military machinery of defense with our peaceful methods & goals, so that security & liberty may prosper together". Dwight D.Eisenhower.