This document contains guidelines for a UAS operator or manufacturer in order to obtain the evidences that the UAS is designed considering system safety and reliability and perform the required safety analyses to fulfil part of OSO#5 requirements, for low and medium level of robustness, as part of the SORA risk assessment (AMC1 to Article 11 Rules for conducting an operational risk assessment in [1]) under the Specific category of EASA drone regulation [2].