To be able to better understand and compare this aspect I wonder if anyone here has information on commercial or test pilots actually performing rudder doublets on Boeing aircraft and their resilience to that kind of pilot action. Condition being inflight and above 200 knots.
Rudder doublet tests on transport category aircraft are approached with extreme caution. They are usually requested by engineers seeking to validate the estimated aerodynamic loads they used in the design and ground testing of the structure of the vertical surfaces.
Such tests are not done without much forethought and a careful briefing..