wrote:
AD forcing modification of the stops. A student and instructor were
killed when the rudder locked hard over when entering a practice spin
and they couldn't stop the rotation, thereby preventing spin
recovery.

btw, according to the accident report (you should be able to find it
somewhere
on www.tsb.gc.ca), the student didn't die, but did sustain serious
injuries,
since they spun into a lake.

And if you haven't read the accident report, there was a bunch of
stuff,
including a rudder return spring missing, that contributed to the
rudder
jamming hard over. They couldn't get the rudder to jam over when it was
just
a worn stop bolt, but they recommended an SB for the stop bolt anyhow.
It's well worth the read, rick
ps: And it was a C150, not C152.