In this thesis, the development and construction process of a test bench capable of simulating the operation of an electromechanical actuation system for a secondary flight control surface is analysed and a High-Fidelity numerical model (HF) developed in Simulink is validated with it. The test bench consists of an actuation module, consisting of a sinusoidal brushless motor, power module, microbox PC and control unit developed by Siemens and a planetary gearbox, designed and manufactured entirely within the Politecnico di Torino, using the Fused Deposition Modelling (FDM) additive manufacturing technique. A transmission made with a roller chain connects this first module to the braking module, thanks to which it is possible to apply a braking torque directly to the motor output shaft, in order to simulate the action of external forces.