ICAO constantly track human factor negative influence on flight safety. It highlights insufficient development of “mental forecasting perks” shown by “front line” operators like crew members and air traffic controllers. This flaw is targeted by research of human factors components influence over decision making that helps to explain all their interaction. This is a part of current ICAO flight safety paradigm, namely personnel “attitude toward quality or safety issues”. The effect plays role because participation in such research itself helps “front line” operators including air traffic controllers to develop proactive perks of memorizing and thus preventing hazards in their professional activities. Grounding on ICAO risk severity categories (catastrophic, hazardous, major, minor, negligible) it is possible to develop fuzzy models of air traffic control students risk attitude. Properly applied methodology allows to take into account and research their attitude toward flight level norms violations. This is used to resolve ICAO risk triangle with such tangible and well understood indexes and metrics as distance between aircraft under control. Generalized group opinion about risk severity categories can be considered as absolute value of fuzzy membership functions. Grounding on their values the method of air traffic controllers risk attitude estimation is suggested. The results correlate well with main decision-making dominants values. These values are referring to decision making peculiarities received through research of success achievement or failure prevention motivation.