Device and method for assisting aircraft guidance

A method for assisting aircraft guidance, the method being operated by a computation platform for aircraft and comprising at least:

• a step of acquisition of state variables characterizing an aircraft in flight, of environment variables characterizing the environment of the aircraft and of trajectory variables characterizing a reference trajectory of the aircraft,
• a step of calculation of a predicted real trajectory consisting in calculating prediction variables based on said state variables, environment variables and reference trajectory variables, the prediction variables characterizing the prediction of a real roll and/or of a real position of the aircraft for an upcoming change of direction of the aircraft;
• a step of determination of conformity to determine if the predicted real trajectory which is calculated conforms or does not conform to the reference trajectory;
• and
• if the predicted real trajectory does not conform to the reference trajectory, a step of configuration of a trajectory deviation alert informing of the roll and/or of the lateral deviation of the aircraft with respect to the reference trajectory on the upcoming change of direction.