By definition the Type Design includes all of the drawings and processes necessary to define the structural integrity of the aircraft, and includes a listing of all design data to define the FAA-approved configuration of the aircraft. In short, Type Design includes every manufacturing production drawing, process specification, such as welding, heat-treating, and material specifications, operating instructions and manuals, maintenance manuals, structural repair manuals, the Type Certificate Data Sheet, and any other data the FAA decides is necessary to either operate maintain, or alter the aircraft. As an example if one were to place all documentation covering the FAA approval for a Cessna 150 aircraft on the floor, it would probably rise to over twenty feet high. To synthesize the data necessary for an IA to adequately accomplish an Annual or Progressive inspection on a Small Aircraft, the FAA issues a Type Certificate Data Sheet for every Type-certificated products, aircraft, engines, and propellers. These data sheets describe the minimum items that an IA must inspect on each product during Annual and Progressive inspections, along of course, with the list of items contained in FAR 43, Appendix D. The aircraft, to continue to be legal and in compliance with its FAA-issued airworthiness certificate as well as any policy of insurance, must always meet its Type Design or properly altered condition.