Originally Posted by
blind pew
IIRC the investigation data was based on rudder position and there was some doubt as to whether it was pilot error and not a software problem. .
You do not recall correctly, or may have never known. At any rate, in addition to the rudder position data, there is *also* rudder pedal position data, coming from sensors located very close to the rudder pedals. If you read the report, the NTSB They did extensive examination and testing of all components which conceivably could have commanded rudder motion
All information points to it being pilot input, and I don't recall any information which suggested that it was not. Like a lot of things in aircraft accident investigation, there's not absolute 100 percent certainty, but they found no indication it was other than pilot input, and they looked hard to find such.