A human-centered approach was used to develop performance requirements for inflight icing avoidance systems which meet the needs of the operational community. This work was accomplished in the context of a collective national effort to improve forecasts, "nowcasts" and sensed information on icing location and severity. Task-related operator information requirements in terms of information importance, additional desired information, customarily used escape actions, perceived key icing-related decisions and perceived useful range were explored through surveys of pilots of several operational types. Results identified information criteria to serve as guidelines for icing remote sensing systems development. Operationally-predominant vertical escape and avoidance maneuvers imply the need for accurate information along the vertical dimension, especially to allow detection of areas at lower altitudes of the navigation field which would be icing-free. Icing-free location information is found to be important for decisions in all phases of flights.
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