Control lock engaged. Apparently with the control lock engaged it allows just enough rudder movement to taxi the aircraft (combined with differential braking) but no elevator/aileron movement.
story with viewer and link to NTSB report
https://www.avweb.com/flight-safety/accidents-ntsb/ntsb-cites-failure-to-remove-control-lock-in-snodgrass-crash/
Last edited by sandiego89; 8th Jul 2022 at 14:51.