The Auto Flight System (AFS) is the Airbus avionic system in charge to manage and guide the aircraft during its automatic flights. The AFS does not replace human operators yet; instead it assists them in controlling the aircraft. This allows the crew to focus on broader aspects of operations such as monitoring the trajectory, weather and other systems. The system of automatic flight assists the pilot in flying the aircraft within the normal flight envelope, enhancing safety, optimizing performance, reducing pilot workload (fuel consumption) and decreasing costs. This Master Thesis aims to illustrate how the Enhanced Stall Warning function is implemented in the Auto Flight System in order to deliver to the airlines, aircrafts facing with higher standard of safety and reliability.