Al,
It seems that you don't have all the information. The 1320 gross weight increase STC requires ALL the changes needed to convert to the D model except the stainless steel panel over the header fuel tank. The C and CD model are eligible to be converted to the D model with that same list of changes, plus the stainless steel panel over the header fuel tank. That being the case, if the D model was extensively tested and determined to be safe at 1400 lb. gross weight, how can the C or CD model not be safe at 1320 lb. gross weight? It's far from a "paper GWI STC." The fact is, the structure isn't changed in either the 1320 lb. STC or in the conversion to be a D model. Ed
