Abstract: The invention comprises an aircraft ground collision avoidance system which utilizes a flight control computer for monitoring aircraft flight states and calculating preferred aircraft flyup altitudes at which automatic aircraft flyups should be initiated. The flyup altitude is determined by calculating aircraft altitude to be lost during a recovery maneuver from a current aircraft flight state. The invention also comprises an aircraft autopilot for monitoring aircraft flight states and initiating an automatic aircraft flyup when so directed by the flight control computer. The monitored aircraft states include aircraft airspeed, angle of attack, bank angle and velocity. Sensor lag, aircraft load factor and engine throttle position are also considered in determining when to conduct an automatic aircraft flyup.