Abstract: In the field of the calculation of the approach trajectory of an aircraft, and relating to a method for determining a corrected lateral approach trajectory as a function of the energy to be reabsorbed before the landing, and also to a flight management system making it possible to determine the corrected lateral trajectory, a method comprises: determining an energy of the aircraft Eaero upon crossing the runway threshold on the basis of a predetermined approach trajectory and of a current state of the aircraft, said state comprising at least one current altitude, a current ground speed and a mass of the aircraft; comparing the energy Eaero with a predetermined maximum energy Emax, and when the energy Eaero is greater than the energy Emax, determining the corrected lateral approach trajectory as a function of the difference between the energy of the aircraft Eaero and the maximum energy Emax.

Abstract: A method for determining the quantity of fuel in an aircraft and an optimization criterion such as a cost index, notably used in an FMS, making it possible to maintain a time requirement of the RTA type, comprising a first step of computing the optimization criterion CIi as a function of the aircraft weight GWi-1 via a method of the RTA type and a second step of computing the weight of the aircraft GWi as a function of the optimization criterion Ci-1 computed in the first computation step and the aircraft weight GWi-1, executed by successive iterations, until the estimated flight time resulting from the computed parameters after the second computation step makes it possible to observe the time requirement to within a determined criterion ?t, a last step determining the pair of values of aircraft weight GWi and of performance criterion CIi-1 allowing an optimal fuel payload and the maintenance of the RTA.

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: A method for determining the quantity of fuel in an aircraft and an optimization criterion such as a cost index, notably used in an FMS, making it possible to maintain a time requirement of the RTA type, comprising a first step of computing the optimization criterion CIi as a function of the aircraft weight GWi-1 via a method of the RTA type and a second step of computing the weight of the aircraft GWi as a function of the optimization criterion Ci-1 computed in the first computation step and the aircraft weight GWi-1, executed by successive iterations, until the estimated flight time resulting from the computed parameters after the second computation step makes it possible to observe the time requirement to within a determined criterion ?t, a last step determining the pair of values of aircraft weight GWand of performance criterion CIi-1 allowing an optimal fuel payload and the maintenance of the RTA.

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.