International audience Summary Recently, several Small and Medium Enterprises (SME) innovate and propose new means of transportation. These projects have to deal with some important issues regarding the regulation whereas it is not fully available for this kind of development. The certification process, critical activity for any enterprise in this industry, constitutes a major challenge for this SME who are not completely aware of all requested constraints. These SME, disadvantaged on this complex market, may ask for a methodological support. We offer in our research to build a Model Based Systems Engineering (MBSE) framework and a structured process modeling to answer to this specific concern.