Phoenix X,
During frequent visits to Edwards Air Force Base in California, crews would experience test flights by Test Pilot students where they would work the rudder stop to stop generating max yaw (yaw damper off) to visit the rudder limits. On an FCF (Functional Check Flight -post heavy MX) it was routine to get maximum rudder excursion stop-to-stop and then turn the yaw damper on. The book said the yaw cycles had to stop within 2 swings for the yaw damper to pass. Never lost any rudder parts.
These were in a 737-200 Advanced (T-43)
The aircraft reportedly barrel rolls quite nicely.
We also did stalls right through the stick shaker to the break on FCF flights. Flies like a Cessna 150 with minimal loss of altitude. More flap out = more roll. Every pilot should get the opportunity to experience a series.
PT