wrote:
A broken rudder return spring won't contribute much, if any, to
the stop-locking problem, but it will make the airplane fly cockeyed
unless you hold pedal pressure against the good spring. We used to
run
two 150s, and had (and still do have) springs break at various times
both in the 150s and 172s. The pilot complains of really bad rudder
trim. The rudder cable tension is determined by the springs, and
isn't
very high at any time.

Well, the report is at
http://www.tsb.gc.ca/en/reports/air/...4/a98q0114.asp
and it clearly states that they were only able to reproduce the case
where the rudder jammed past the stop bolt by removing the rudder
return
spring. It's about 2/3rds of the way through the document, after all
the
stuff about CARs violations. (It sounds like slackness of the rudder
cable
was the deciding factor.) It also required up elevator to allow it to
go
past the stop bolt(but of course that would be the case when doing an
intentional spin).

Interesting reading. Oh, and I was incorrect before, it was a C152,
rick