Evolution Vs Over Gross
Don’t confuse evolutionary weight increases with operating outside of an aircraft’s published weight. The S-76 is a good example. Each evolutionary growth in weight was a planned, designed and certified as a growth version of previous models. The gross weight increases were accommodated for with structural beef ups and an increase in operating rotor speed to provide the required lift. Similarly, the MH-60K, a growth version of the Basic Blackhawk, operates at increased gross weight form the basic model. It this instance the dynamic components of the MH-60K are identified and tracked separately. The MH-60 component lives are significantly reduced as a result of this higher gross weight envelope.