Document Type


Publication Date





The Next Generation Air Transportation System (NextGen) proposes many new tools and capabilities to meet goals of increasing the capacity, safety, and efficiency in the National Airspace System (NAS). This effort aims to assess the potential effects of off-nominal conditions on human performance in the NextGen environment. To complete this assessment, a comprehensive list of off-nominal conditions with potential NextGen consequences was developed. This condition list was then compared against the changes proposed in each NextGen Operational Improvement to determine the potential positive and negative effects on human performance in terms of safety and efficiency. The most frequently cited off-nominal conditions with potential negative effects on human performance included: Incorrect/Missing Information in Data Block/flight plan, Inadvertent Sector Overload, Conflict/Proximity/Other alert activates erroneously, and Runway Closure. These conditions represent key areas that could have crosscutting impact on controller performance and should be utilized to develop requirements for NextGen midterm concepts.