Analysis of required landing distance on performance improvement of civil aircraft

During the course of accident investigation after many serious airplane accidents or incidents, the problem of calculating landing distance is raised to prevent aircraft overrunning the runway. The factors that affecting the landing distance and possible means to improve the landing performance should be fully acknowledged by air-framer. The definitions of actual landing distance and required landing distance is elaborated in this paper based on related airworthiness regulations and air-framer's experience. What's more, the effect of final approach speed, braking system, runway condition, runway friction coefficient and airport elevation for aircraft stopping performance is also explained by some flight tests and simulation.