I should perhaps throw in a little info on the Canadian spin accident. Ice was not a factor as the crash happened on the 18th of July 1998.
Maintenance was a factor though. In addition to the rudder stopper issue, the rudder bar return spring was missing due to improper maintenance.
You can read the full report here:
http://www.tsb.gc.ca/en/reports/air/...4/a98q0114.asp
Interestingly, I did my intial training for my PPL with the flight school involved in the crash; at the time (1980) they flew a fleet of C150s for ab-initio training. I had an excellent instructor but he was fired, so after my solo x-country, I switched to another smaller school and completed my PPL on a nearly new C152. The C150s at the earlier school were, umm, considerably less attractive.
Gosh can it be 27 years already...