Analysis Of Landing Long Flare Based On QAR Data

The long flare during landing of an airplane refers to the phenomenon that the distance from the beginning of flying over the runway to the end of touchdown exceeds the normal flare distance.The landing long flare is a common deviation in the landing process,which not only affects the safety of aircraft operation and the efficiency of airport release,but also has the risk of the aircraft rushing out of the runway in severe cases.It is the most common unsafe event except the high vertical load of the aircraft landing.In order to analyze the general reasons for the landing long flare of the aircraft,this paper first uses the QAR data of the aircraft landing approach to filter out the various parameters that affect the aircraft state and explains the influence of various parameters on the landing long flare based on the flight principle and the requirements of airline’s stable approach.The impact of the landing long and flat.Through the CREAM model,the common errors of the flight crew in the landing long flare event are obtained.Afterwards,we collect and process330 groups of QAR data of flight approach and landing phase,and used clustering and concise methods to filter out the key parameters that affect the state of the aircraft during the landing phase.After interviewing the senior captain of the airlines,17 QAR parameters are selected from the perspective of flight crew control and monitoring,and a database of QAR parameters affecting the landing long flare is established.Then,the correlation analysis and mean value analysis of the QAR parameters that affect the landing flare distance are carried out,and the influence of each parameter on the landing drift distance is qualitatively discussed.Using stepwise multiple linear regression to get the landing long flare model,the analysis shows that the touchdown time and the maximum tailwind value are the key indicators that affect the airplane’s flare distance,and the touchdown time and the maximum tailwind value are proportional to the landing flat drift distance.Combining the QAR database and using the entropy method to assign the probability and risk of the impact factors,and using the TOPSIS model to calculate the risk closeness of each index and sort them into 7 levels,it is obtained that the aircraft descent rate is the most serious risk that causes a long flare landing.Finally,according to the flight practice,the three risks that cause the long flare landing are analyzed:high aircraft energy,downwind tailwind or windshear,poor crew resource management and poor decision-making consciousness,and puts forward the corresponding management and control recommendations.