The emergence of suborbital vehicles for space tourism and scientific missions has introduced complex safety challenges that require robust engineering solutions. Traditional safety assessment methods, such as Fault Tree Analysis (FTA) and Failure Mode and Effects Analysis (FMEA), have been essential but insufficient in addressing the high complexity and integration requirements of modern aerospace systems. This thesis proposes the use of Model-Based Systems Engineering (MBSE) to enhance the safety assessment of suborbital vehicles, particularly focusing on Virgin Galactic’s SpaceShipTwo as a case study. Leveraging the ARCADIA methodology and Capella tool, an MBSE approach is applied to model the entire system architecture, including its subsystems: - Propulsion; - Hydraulic; - Structure; - Control systems.