Remember Va applies in the longitudinal ie pitching plane only. It DOES NOT APPLY to partial or full deflection of the rudder or ailerons.
FAR 23 and FAR 25 certification standards
NOPE!
Va does indeed apply to all controls but there are some additional factors for the designers:
- many aircraft types are certified to early versions of the regs, or even the old US CAR's so just don't read the current regs, go back to the applicable issue status as many things have changed over the years
- the designer must provide for full control deflection unless limited by "pilot effort". There are specified values of pilot forces for each of the controls which can mean, for many aircraft types, that only partial control deflection is designed for at Va.
I recall working with one test pilot who would easily apply more than the standard rudder pedal load. He couldn't believe it when we put a load cell on the pedal and told him how hard he was pushing.