Method and system for assisting the avoidance of an excursion by an aircraft from a runway or taxiway of an aerodrome

A method for assisting the avoidance of an excursion from a pathway of an aerodrome by an aircraft taxiing on the pathway, said method comprising:

• a monitoring step (E1), implemented by a monitoring unit, at least for the purpose of monitoring the aerodrome so as to allow the detection of at least one characteristic element of a pathway, for determining a current relative position of at least one landing gear of the aircraft (AC) with respect to the detected characteristic element, and for detecting a future excursion from said pathway of the aerodrome by the aircraft (AC) on the basis of, at least, the current relative position and parameters of the aircraft (AC), said characteristic element or elements comprising at least one boundary between an area surfaced for traffic on a pathway and an area not surfaced for traffic, the monitoring step (E1) using a radar for detecting the boundary between the area surfaced for traffic on a pathway and the area not surfaced for traffic;
• and
• a step of assisting avoidance (E2), implemented by at least one unit for assisting avoidance, so that, at least, if a future excursion is detected in the monitoring step (E1), at least one action for assisting the avoidance of said future excursion is implemented.