my thought on the matter is that the max demonstated is the number that during testing the test pilot had no more available rudder authority to align the aircraft with the center line.
two things come to mind, this was a brand new fresh off the lines aircraft and a “test” pilot with undoubtable more experience than me.
My personal feeling regarding “by the Book” numbers is +10% in my favor. If i am calculating T/O or landing distance i add at least 10% for error. because i might not have the perfect teqnique or taking into account the age of the aircraft i.e. brakes, engine weare etc.
I always leave a little cushion room just in case.
Exactly, the maximum demonstrated crosswind is exactly that, not a limitation. It was whatever the crosswind component was the day the test pilot went flying. That being said, one should always fly within their own ability, just because the airplane can do it, doesn’t mean the pilot can.
That’s not always the case and would depend on specific language excepting such losses in the policy. The demonstrated crosswind numbers are not a “do not exceed” figure", they’re a suggestion.
Think of it as akin to those speed signs we see on highway turns giving suggested “safe” speed limits for the turn’s radius. They don’t require that speed, merely suggest it as the safest course of action.