Study Of Takeoff And Landing Performance Algorithm On Contaminated Runway For Civil Aircraft

Aircraft performance is one of the important factors of flight safety,it plays a very important role in both the airworthiness certification and the actual operation,and the impact of takeoff and landing performance on contaminated runway is more significant.In order to support the certification and flight safety of domestic civil transport aircraft,it is necessary to study the model and algorithm of contaminated drag and takeoff and landing distance on contaminated runway.On the basis of studying the relevant regulations of airworthiness and operation at home and abroad,the calculation model of contaminated drag of various contaminants such as water,slush and wet snow is established based on EASA AMC25.1591.According to the difference of takeoff and landing characteristics between contaminated runway and dry or wet runway,the dynamic calculation model of takeoff and landing distances on contaminated runway are established,and the engineering integral and numerical averaging are designed,then programmed the algorithm by Fortran.Taking the data of domestic aircraft for example,the effects of different contaminants,takeoff and landing weights,V₁ speed on takeoff and landing performance are calculated and analyzed.The results show that the calculation model and algorithm for contaminated drag and takeoff and landing performance on contaminated runway are efficient and reliable,and the calculation results meet the engineering needs.Finally,the basic methods of takeoff and landing performance of domestic civil aircraft on contaminated runway are introduced,and the correction methods are compared with those of Boeing and Airbus.