On Feb 19, 9:42 pm, C J Campbell
wrote:

The plane is not airworthy if this is the condition. I doubt that the
CFIs are aware of it. Even if they were, they might not report it
because they don't want the plane taken off the line for repairs.

A broken rudder bar spring can cause the rudder to jamb in a spin
recovery. After that there is no way to recover from the spin. Pushing
on the rudder harder just jambs it harder.

See here for a related accident report:

http://www.tsb.gc.ca/en/reports/air/...4/a98q0114.asp

That airplane had two problems: A busted spring, which really
wasn't the issue, and badly worn rudder hinges, which allowed the
rudder stops to override the stop bolt heads and lock in a fully-
deflected position. Since they couldn't get the spin rotation stopped,
they couldn't break the stall. The busted spring was just another
symptom of really poor maintenance. The FAA issued an AD on it.

Dan