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This paper illustrates the development of an Object-Oriented Bayesian Network (OOBN) to integrate the safety risks contributing to a notional “lost link” scenario for a small UAS (sUAS). This hypothetical case investigates the possibility of a “lost link” for the sUAS during the bridge inspection mission leading to a collision of the sUAS with the bridge. ...This hypothetical case investigates the possibility of a “lost link” for the sUAS during the bridge inspection mission leading to a collision of the sUAS with the bridge. Hazard causal factors associated with the air vehicle, operations, airmen and the environment may be combined in an integrative safety risk model.