casper
as the builder of the part of the rudder actuator has taken the lion's share of the liability in the pittsburgh crash, and that the FAA has mandated that there be a "fix" to the rudder problem ( in this case a radio altimeter input to reduce hydraulic pressure to the rudder above 700'agl) I think that we can gather that the rudder was the problem.
as to mountain wave in the colorado springs tragedy, it is up to you to decide for yourself.
I've decided that the rudder is a POS