Calculation Of Net Flight Path In The Whole Takeoff Process Under Complex Conditions Research On The Method Of Rule Compliance Determination

In an airport with complex terrain,the emergency procedures for the first engine failure often last several tens of kilometers,covering 1-4 sections of the take-off flight path.In order to meet the obstacle surmounting requirements of the operational regulations in the case of the first engine failure,it is often necessary to build the whole net flight path to show the compliance with the regulations,especially in the design of RNP emergency procedures for the first engine failure.At present,in the performance software of manufacturers such as Boeing and Airbus,only the straight-line departure under the standard second segment can output the net track data of the third segment.For take-off under complex conditions such as extension of 2 segments,turning and departure,there is no data of the third segment net track,so it is impossible to build the whole net track of take-off flight.Based on the total track data calculated by the track simulation performance software,according to the regulations of Ministry of civil aviation 25,the calculation of the third section net track data under complex conditions is realized by converting the available climb gradient and acceleration.The calculation data is compared with the data calculated by the take-off analysis table performance software in the standard two-section straight-line departure mode.The results are accurate and meet the requirements of civil aviation operation.Combined with digital terrain,it provides a direct and feasible method for the compliance verification of the first engine failure take-off regulations in complex situations.Aiming at the complex terrain airport and Plateau Airport,this paper studies the obstacle surmounting decision of long-distance obstacles along the eosid or Sid departure track.Based on the simulation calculation of the total flight path of one engine failure,by constructing the whole net flight path including four sections of the take-off flight path,analyzing the end point of the take-off flight path,and constructing the net flight path of the route,CCAR 121 net flight path obstacle crossing requirements,net flight path obstacle crossing requirements,ICAO doc 8168 total flight path obstacle crossing requirements and their combination are used,The criteria and methods of obstacle surmounting for long-distance obstacles are compared;The effects of different leveling heights on aircraft obstacle surmounting capability in different airports are compared by simulation.Two typical high plateau airports and an ordinary airport are taken as examples to analyze.At last,the conclusion of comparison and the suggestion of regulation revision are given.