Detection Strategy of Unstable Approach Based on Possibility Measure

This paper presents a possibility measure based model to detect the unstable approach in flight data analysis. The key elements of stabilized approach, energy height, and some other related flight parameters, including approach speed, touchdown speed, corrected wind speed, approach angle, landing configuration, engine thrust, and etc., are used to establish the fuzzy sets. Therefore, a fuzzy integrated judgment model is also proposed, which would quantify the distance between the current approach and the stabilized approach in the possibility space. Furthermore, the implications of this strategy for practitioners and future work are analyzed.