This Operational Services and Environment Description (OSED) will support a performance-based regulation for non-segregated RPAS operation. It will cover required functions which meet the operational description, adding Remain Well Clear (RWC) as a necessary function in all airspace classes. Initially intended to be included as an appendix to ED-271A “MASPS for Detect and Avoid (Traffic) under IFR”, it was published as a separate standard and will be the base for the definition of ED-271A. ED-238 and ED-258 are superseded by this standard.