This thesis work was developed in collaboration with TXT e-solutions in order to improve a single aisle civil aircraft flight simulator mathematical model. The starting point was an existing model, referred to an Airbus A320, already available inside the company. To achieve this goal the procedure adopted was articulated in the following manner: first it was required an analysis of the existing assets in order to highlight the major lacks and the elements that prevented the model to be used with other aircraft. Then, it was necessary to learn to use some tools to produce the values which, inserted inside the simulator model, were able to reproduce the behaviour of other aircraft.