Some (but by no means all) of the comments above seem to be of the opinion that over-locking of rudder was somehow only a problem with aircraft having multiple (more than one) vertical tail surfaces. This is most certainly not true. One type of aircraft that had considerable trouble with this type of design defect was the well-known (well it used to be in the good old days!) Bristol Freighter (model 170), with one in fact being destroyed during a normal flight, having lost its entire fin and rudder (from memory). I think I read this in the Putnam book on Bristol Aircraft, so check that out for confirmation. This accident occurred in late 1940s, or very early 50s, and I have an idea it was an early model, and thus lacked the later modification of an additional amount of fixed fin located forward of main fin, which was typical of all later-built Bristol Freighters.