I thought certification required a single application of the control input. Didn't the separation of the fin from the fuselage involve a couplet or two, and not a single application?
Correct,a single full rudder application up to VMO/MMO still has a 50 % safety load on it but where it hurts is reversal of input...ie full left followed by full right.
On the 737,at speed above 137 kts,rudder pressure is limited by 25 %.