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Recent technological developments and increased utilization of Unmanned Aircraft Systems (UAS) have widened their application from military operations to also civil and commercial operations. UAS are most beneficial when they can share the whole airspace with manned aircraft. However, integration of UAS into non-segregated airspace is only viable if UAS operations are proved to be safe enough. The concern is that UAS operations could pose a safety problem for other aircraft and persons or property on the ground [19]. The objective of this paper is to develop and apply a safety risk analysis methodology for the risk of collision of an Unmanned Aircraft System with the ground. 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.