This paper is focused on the safety of mini UAV (mUAV) systems. It presents the great efforts that are being done in air legislation, including the present and future normative. Nevertheless, considering that the work is not finished yet, a low-level risk analysis concept is introduced. Based on the international regulations, a specific three-step structure for mUAV hazard analysis is presented: identification, assessment, and reduction in a recursive loop that provides a solid architecture for facing the wide range of possible risks.