Discussion
Rudder lock is a mechanical jamming of the control run. True or false?
Answer: C
Correct answer: False, the surface floats over after the fin stalls
Rudder lock is aerodynamic, not mechanical. At large sideslip the fin stalls, and the separated flow reverses the rudder's hinge moment so that the surface is driven towards its stop rather than towards centre, floating hard over.
The linkage is intact and nothing has seized; the pilot simply cannot generate enough force to overcome the reversed aerodynamic moment. That is why the cure is a dorsal fin, which prevents the fin stall, rather than any change to the control run. Balance and hydraulics affect the forces involved but neither causes the condition.
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