Abstract: According to the method, the path is built from a flight plan defining a plurality of successive segments of this path, called legs. The method includes a first step for adapting a distance to be flown over the manual leg in a selected manner, as a function of data introduced by the pilot, or automatically, as a function of the leg following the manual leg such that the constraint of this following leg can be respected and a second step for integration into the path of a termination point of the manual leg as a function of the distance to be flown over this manual and the construction of a modified segment of the path from this termination point.

Abstract: A method determines the optimal turn direction of an aircraft among two directions, right and left, following a lateral trajectory to join an arrival straight charted by an angle of arrival, based on a departure point and angle of departure defining a departure straight oriented along movement of the aircraft, the direction defined by a respectively positive or negative optimal turn sign, comprising: determining a conventional departure sign of the departure point; determining a center value of an angle of change of course equal to the difference between the angle of arrival and angle of departure referred back between ?180° and +180°, the center value exhibiting a logical sign corresponding to the center value sign of the angle of change of course; determining the sign of the optimal turn based on comparison between the departure sign and the logical sign, the sign of the optimal turn defining optimal turn direction.

Abstract: A method determines the optimal turn direction of an aircraft among two directions, right and left, following a lateral trajectory to join an arrival straight charted by an angle of arrival, based on a departure point and angle of departure defining a departure straight oriented along movement of the aircraft, the direction defined by a respectively positive or negative optimal turn sign, comprising: determining a conventional departure sign of the departure point; determining a centred value of an angle of change of course equal to the difference between the angle of arrival and angle of departure referred back between ?180° and +180°, the centred value exhibiting a logical sign corresponding to the centred value sign of the angle of change of course; determining the sign of the optimal turn based on comparison between the departure sign and the logical sign, the sign of the optimal turn defining optimal turn direction.

Abstract: The present invention relates to a method for replacing legs in an air navigation procedure described as a series of legs, the legs forming part of an initial family of legs. The method includes: a step of determining a restricted family of legs included in the initial family of legs, so that each leg not belonging to the restricted family corresponds to a combination of legs belonging to the restricted family: The method also includes: a step of replacing in the navigation procedure the legs not belonging to the restricted family with combinations of legs belonging to the restricted family.

Abstract: The invention relates to a method of calculating a path which is offset laterally by a first distance with respect to a reference path, comprising the calculation of a flight plan which is offset with respect to a reference flight plan. The reference flight plan is defined on the basis of waypoints and of segments defining a reference path between the waypoints. Each segment has a start point and an end point making it possible to define a course corresponding to the direction of travel by an aircraft. The laterally offset flight plan is calculated on the basis of waypoints associated with the waypoints of the reference flight plan, called associated points and being situated at the intersection. The laterally offset flight path includes lines, parallel with the segments of the reference flight plan, offset by the first distance from the reference flight plan. It is further defined by the bisectrix of the angle formed by two adjacent segments at a waypoint belonging to the reference path.

Abstract: Flight management systems can behave erratically when the distance measurements on which they are based are subject to value jumps because they liken these value jumps to movements of the aircraft performed at speeds exceeding the performance levels of the aircraft for which they were designed. To avoid this, the proposed flight management system uses a filter to spread the distance value jumps in time, over periods of the order of those needed for the aircraft to come through the distance differences that they represent. This filter replaces a value jump with a ramp making up the difference and corresponding to a movement that remains within the performance scope of the aircraft.

Abstract: A method for optimizing the computation of the position of the braking point on the approach to a holding circuit for aircraft is provided. The method comprises computing the optimal position of the theoretical deceleration point allowing the aircraft to pass from its current speed to the maximum speed authorized at the entry point and of the theoretical deceleration distance, computing a trajectory portion forming a turn allowing the aircraft to enter the holding circuit and the position of the point of the start of the turn, computing a point for anticipating the turn, making it possible to take into account the banking rate of the aircraft, computing a margin, and computing the start-of-braking point, situated at a distance.

Abstract: The present invention relates to a trajectory calculation method making it possible to join a so-called military trajectory (Tm1) from a so-called civil trajectory (Tc1) and, reciprocally, to join a so-called civil trajectory (Tc2) from a so-called military trajectory (Tm1). For example, if the flight of an aircraft (A) must comply with civil standards over part of its flight plan and then perform a mission comprising tactical constraints before returning to a civil trajectory, the method described in the present patent application is entirely suitable.

Abstract: The invention relates to a method for positioning reporting points that allows an exact positioning of the said reporting points on the track to be conserved, by continually using their original references in order to reposition these points each time the track is recalculated. The advantages of this solution are, on the one hand, to continually position the reporting points along the track rather than off the track and, thus, to locate the reporting points exactly notably in terms of distance, time and altitude.

Abstract: The present invention relates to a method for replacing legs in an air navigation procedure described as a series of legs, the legs forming part of an initial family of legs. The method includes: a step of determining a restricted family of legs included in the initial family of legs, so that each leg not belonging to the restricted family corresponds to a combination of legs belonging to the restricted family: The method also includes: a step of replacing in the navigation procedure the legs not belonging to the restricted family with combinations of legs belonging to the restricted family.

Abstract: The invention relates to a method of calculating a path which is offset laterally by a first distance with respect to a reference path, comprising the calculation of a flight plan which is offset with respect to a reference flight plan. The reference flight plan is defined on the basis of waypoints and of segments defining a reference path between the waypoints. Each segment has a start point and an end point making it possible to define a course corresponding to the direction of travel by an aircraft. The laterally offset flight plan is calculated on the basis of waypoints associated with the waypoints of the reference flight plan, called associated points and being situated at the intersection. The laterally offset flight path includes lines, parallel with the segments of the reference flight plan, offset by the first distance from the reference flight plan. It is further defined by the bisectrix of the angle formed by two adjacent segments at a waypoint belonging to the reference path.

Abstract: Flight management systems can behave erratically when the distance measurements on which they are based are subject to value jumps because they liken these value jumps to movements of the aircraft performed at speeds exceeding the performance levels of the aircraft for which they were designed. To avoid this, the proposed flight management system uses a filter to spread the distance value jumps in time, over periods of the order of those needed for the aircraft to come through the distance differences that they represent. This filter replaces a value jump with a ramp making up the difference and corresponding to a movement that remains within the performance scope of the aircraft.