Ron Natalie wrote:
Tom Young wrote:

Yes, but just on the fly like that? I assumed that the builder sets it
when he originally certifies the airplane and has to recertify if he
wants to change it later. Am I wrong about that?

Yes, you are wrong. Of course, the gross weight is initially set
prior to any test flying that could be used to reasonably verify if
the aircraft is capable of it.

Subsequent changes only require "notification", not recertification.

Okay, good to know.

Tom Young