The Research on Net Takeoff Flight Path Calculation Method Based on Gross Flight Path Under Complicated Condition

In the operations at high elevation/complex terrain airport, to comply with the one engine inoperative take off flight path obstacle clearance requirement, the whole net takeoff flight path which often last over hundreds of kilometers need to be constructed, the key segment is the net third segment. At present, the manufacture’s performance software, include Boeing and Airbus, can only export the net third segment data in standard second segment and straight out departure condition. for more complicated operation condition, such as extended second segment, turn and its mix departure, it has not net third segment data. In this paper, a new climb gradient acceleration rate method to calculate the net third segment is proposed, which is based on the gross flight path data calculated by manufacture’s trajectory simulation performance software, and can handles the complicated operation conditions mentioned early. Take B737-700 for example, the different result are compared using manufacture’s performance software, a simplified method and the new climb gradient acceleration rate method. The results show the new method has better precision than existing simplified method, and can show the regulation compliance in the one engine inoperative take off under complicated operation.