Thanks for the input fellows. I realize a system to prevent the overstressing would be cost prohibitive. What we are looking for, mainly, is a way to monitor the stresses on the wings as an indicator for maintenance. In making drops, in rough air, it is hard to tell how much stress the plane absorbed. In an earlier post on the crash of the C-130 in Calif. it was mentioned that Canada uses about 7:1 flight hours on low level ops. I was under the impression that this information was stored and could be downloaded for analysis of the stresses put on the wings.