Does anybody know any limitations of flight control weights? For instance elevators must have same weight? What is the acceptabld difference/limits and what would be the reason of overweighting? (Paint, bushings, repairs etc). Please consider A320s and B737s for giving example
Flight control mass balance weights are used primarily to prevent things like flutter. Most airline manufacturers are able to perform analysis of their designs to determine the exact weight to introduce, and where to place it. The rest use static balancing. This article from the Experimental Aircraft Association is not an airliner example, but it provides a good explanation of the why and how of flight control balancing.