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But the skies can only really open up to UAS when there is an agreed upon UAS safety policy with commonly accepted UAS Safety Risk Management (SRM) processes enabling to show that the risks related to UAS operations in all the different airspace classes can be adequately controlled. ...The purpose is that all potential risks of the newly proposed UAS operations are controlled so that the existing safety level does not decrease (i.e. provides the baseline from which safety requirements for new proposed UAS operations are derived). A survey of UAS activities provides an initial view on the risks and hazards to be considered, the needs and role of potential SRM users, the scope of the aviation system to be considered, the risks to be regulated, selection of suitable risk metrics, and the setting of an acceptable level of safety. ...Although Unmanned Aircraft Systems (UAS) have now for some time been used in segregated airspace where separation from other air traffic can be assured, potential users have interests to deploy UAS in non segregated airspace.

However, integration of UAS into non-segregated airspace is only viable if UAS operations are proved to be safe enough. ...Such method could support regulators with the setting of UAS safety requirements. It may also be used by applicants (UAS operators and manufacturers) for identification of UAS related hazards, causal factors, and accident scenarios. ...Specific UAS related ESDs are added to cover UAS specific hazards that do not exist in manned aircraft operation [12].