Safety Barrier Diagrams for Specific Operations of Drones

For unmanned aircraft as well as conventional aircraft, the flight safety resides in the combination of multiple safety barriers. Return To Home or Flight Interruption are usual operational safety barriers that can mitigate hazards occurring during a drone operation. The paper presents Safety Barrier Diagrams, a graphical notation that formalizes safety policies used to manage drone ground risk and air risk. Furthermore, the paper explores how to use the diagrams in order to support risk assessment activities required by the EU Regulation applicable to drone operations in the specific category.