1.1 This standard practice defines design and test best practices that if followed, would provide guidance to an applicant for providing evidence to the civil aviation authority (CAA) that the flight behavior of an unmanned aircraft system (UAS) containing complex function(s) is constrained through a run-time assurance (RTA) architecture to maintain an acceptable level of flight safety.

1.2 This practice will have the benefit of enabling highly automated UAS operations. It is envisioned that applicants will use this practice as a means of compliance for safe implementation of complex functions for routine operations.

1.3 Verification of complex functions is considered too challenging to use conventional software assurance methods such as RTCA DO-178C or IEC 61508. Certification challenges under these standards include generating required artifacts, such as requirements, elimination of unintended functionality, traceability/coverage, and test cases required for verification.

1.4 There is significant interest from industry and CAAs to have a standard practice to enable flight operations for UAS containing complex functions. Developing a certification path for these UAS technologies could also advance safety in General Aviation.

1.5 The following design tenets are offered to provide guidance to the UAS manufacturer as to the intended application of this standard.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.