Abstract The airframe material selection is decisive to determine target weights as well as manufacturing and operating cost of aircraft components. It is a prerequisite for production planning and long lead time items. In addition, it is key for identifying any material-related certification risks and for establishing the certification process planning and means of compliance. It is therefore very important to freeze the material decision for components well before a new aircraft is offered to the market. This chapter starts with a discussion of the development process of new aircraft and the definition of the basic milestones. Fundamental aircraft requirements of operators, authorities and airframe manufacturers influencing the material decision are highlighted, and the requirement cascade is introduced. The functional analysis method as part of the design process is explained followed by the description of the general procedure of the structure stressing and certification process. Special emphasis is put on the description of the “no crack growth” concept of CFRP structures.


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