Calculation of Vertical Deviation During the BARO-VNAV Phase of the High-altitude RNP AR Procedure Based on FOQA Data
Due to their unique geographical locations and climatic conditions,high-altitude airports typically use RNP AR procedures to ensure safe and efficient flight.Currently,the FOQA decoding system lacks monitoring items for risks related to RNP AR,leading to an inability to systematically assess the risks of controlled flight into terrain and unstable approaches during the BARO-VNAV phase.This study proposes a calculation method for vertical deviation during the BARO-VNAV phase of the RNP AR procedure based on the characteristics of FOQA data waypoint and bearing collection.This method can effectively monitor the aircraft's deviation from the vertical profile after the final descent point and issue alerts based on thresholds.After analyzing historical flight data using this method,the author identifies main reasons for significant vertical deviations during the RNP AR procedure's BARO-VNAV phase as temporary resets of the flight computer,crew misoperation and premature activation of vertical navigation mode.The research results have a positive impact on risk identification and operational improvements for high-altitude operations in China.
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