reminded me of this likely unrelated history explained by Admiral_Cloudberg: "The crashes of United Airlines flight 585 and USAir flight 427: the Boeing 737 Rudder Defect - Analysis"<p><a href="https://old.reddit.com/r/CatastrophicFailure/comments/adl0jk/the_crashes_of_united_airlines_flight_585_and/" rel="nofollow">https://old.reddit.com/r/CatastrophicFailure/comments/adl0jk...</a><p>edit: rollout guidance servo is of early interest:<p>"On February 28, 2024, the Systems group met at the Collins Aerospace facility in Cedar Rapids, Iowa to examine and test the SVO-730 rollout guidance servo removed from the incident airplane. The testing was conducted to evaluate the effects that temperature “cold soaking” of the servo might have on the torque required to move the servo’s output crank arm. Testing at room temperature found that the torque to rotate the servo’s output crank arm was within design specifications. The unit was then “cold soaked” for 1 hour and the test was repeated. That testing found that the torque to move the servo’s output crank arm was significantly beyond the specified design limits. Because the servo output crank arm is mechanically connected to the rudder input torque tube, the restricted movement of the servo’s output crank arm would prevent the rudder pedals from moving as observed during flight 1539 and the test flight. Further examination of the SVO-730 rollout guidance servo will be conducted as the investigation continues.