Analysis of the Minimum Operating Height in Altitude Hold Mode

A type of computing the minimum height of aircraft autopilot in altitude hold mode was introduced. According to the airplane speciifcations about minimum operating height, system safety and lfight control system, this paper ifxed the minimum operating height in altitude hold mode of aircraft autopilot which is designed by critical function and noncritical function, and put forward the height as the minimum height of autopilot designed in noncritical function when pilot could pull up the aircraft safely within overload and stall restriction after the most severe failure happened. Furthermore, this article gave an example to apply this method to an aircraft, researched the operating notes when use altitude hold mode in low height for a long time.