Are we suggesting that a fault identified over 30 years ago hasn’t been fixed? Please.
BTW classical “dutch roll” when I learned aerodynamics didn’t involved the rudder at all. It was a symptom of a mismatch between the wing dihedral and the area of the vertical stabilizer, plus other side areas both ahead of and behind the center of mass. Some designs, notably the Bristol Beaufighter cured dutch roll by raising the tips of the horizontal stabilizer to form a distinct vee.
Yes I am saying it’s the same problem.
The FAA said s using the “Dutch Roll” to cover up the problem. What it is the rudder hardover puts the aircraft into a diving roll depending on where the rudder jams.
And reduced wing sweep. Overly aggressive rudder application or rudder malfunction is usual culprit. Early days of jet flying in military jets could result in loss of airplane. Not normally a catastrophe in mildly swept civ aircraft.