*3.5. Legacy Structural Design*

Design, especially structural, for many military transport aircraft have evolved (to a small or larger extent) from previous legacy versions. There are many examples, such as the Leonardo C-27J, which is an evolution of the FIAT G.222. Legacy design standards are, in general, less cost-e ffective than modern standards, as less e fficient maintainability and reliability standards and practices are employed. This, in turn, has a toll on the structural maintenance and sustainment cost, since a higher volume and/or more frequent inspections and repairs may be required.
