Dynamic simulation models are proving increasingly realistic and reliable, to the extent that they can accurately and faithfully simulate the dynamic behavior of their real-world counterparts, even when the latter are still in the design phase. With this purpose, they are often employed to support the design phase by testing solutions that exist only on paper, resulting in obvious time and resource savings. This thesis carried out in collaboration with TXT E-Tech, aims to investigate the use of a fixed-wing aircraft flight dynamics simulation model to create a "Data Package" for the validation and certification of a "Flight Navigation Procedures Trainer" (FNPT) simulator in accordance with EASA regulations.