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This work is focused on norm operationalization in aviation domain. The investigated paradigm can be described as: from legal norms to technical rules in the artifact. Normative requirements (norms) for the aircraft trajectories are extracted from the flight rules and airport procedures. These norms are operationalized in a decision support system (DSS). An example of a normative rule: keep 3 degree descent angle while landing and hold restrictions of altitude and geography which are depicted in the approach chart. The decision support is based on evaluation of risk to violate the normative requirement. The following risks are modeled: trajectories' conformance with the flight rules, safe distance between aircraft, wake turbulence separation and avoidance of volcanic ash. The DSS is for the air traffic controller (not pilot)must respond in real time. A DSS system provides surveillanceevaluatesrecommendswhereas the human controller takes a decision.