Method for facilitating the approach to a platform by an aircraft, comprising: - a preparatory step for constructing a database of platforms which includes, for each platform, at least one attribute which defines said platform, - a parameter-setting step during which parameters are set for a distance referred to as the "lateral distance ", the lateral distance representing an offset distance separating, at least partially in the lateral direction, the path to be followed from a path which points towards the platform and follows the approach course, - a stage for approach flight along an approach path comprising an initial approach fix, a final approach fix and a decision point that are located in the same vertical plane which is directed in parallel with a course, said target platform to be reached being offset with respect to said vertical plane by an orthogonal distance which is at least equal to a lateral distance, characterised in that: - during said preparatory step, an attribute relating to a positioning error of the platform is stored for each platform, - before said stage for approach flight commencing at the initial approach fix, the value of a position integrity performance required for a location system of the aircraft is determined by means of an integrity-checking module, said position integrity performance being equal to the minimum value between a predetermined performance threshold and the quotient of the difference of said lateral difference minus said positioning error of a target platform to be reached divided by two, i.e.: RNP = min LOV − TPE / 2; k 3 where "RNP" represents the required position integrity performance, "LOV" represents said lateral distance, "TPE" represents said positioning error, "k3" represents said predetermined performance threshold, and "/" represents the division sign, - during a monitoring step carried out during said approach flight step, said aircraft being provided with a GNSS location system which determines the radius of a circle in which said aircraft is located, which radius is referred to as the "position integrity radius ", ∘ said position integrity performance is compared with said position integrity radius by means of said integrity-checking module, ∘ an alert is generated if said position integrity radius is greater than said position integrity performance. - a preparatory step for constructing a database of platforms which includes, for each platform, at least one attribute which defines said platform, - a parameter-setting step during which parameters are set for a distance referred to as the "lateral distance ", the lateral distance representing an offset distance separating, at least partially in the lateral direction, the path to be followed from a path which points towards the platform and follows the approach course, - a stage for approach flight along an approach path comprising an initial approach fix, a final approach fix and a decision point that are located in the same vertical plane which is directed in parallel with a course, said target platform to be reached being offset with respect to said vertical plane by an orthogonal distance which is at least equal to a lateral distance, - during said preparatory step, an attribute relating to a positioning error of the platform is stored for each platform, - before said stage for approach flight commencing at the initial approach fix, the value of a position integrity performance required for a location system of the aircraft is determined by means of an integrity-checking module, said position integrity performance being equal to the minimum value between a predetermined performance threshold and the quotient of the difference of said lateral difference minus said positioning error of a target platform to be reached divided by two, i.e.: RNP = min LOV − TPE / 2; k 3 where "RNP" represents the required position integrity performance, "LOV" represents said lateral distance, "TPE" represents said positioning error, "k3" represents said predetermined performance threshold, and "/" represents the division sign, - during a monitoring step carried out during said approach flight step, said aircraft being provided with a GNSS location system which determines the radius of a circle in which said aircraft is located, which radius is referred to as the "position integrity radius ", ∘ said position integrity performance is compared with said position integrity radius by means of said integrity-checking module, ∘ an alert is generated if said position integrity radius is greater than said position integrity performance. ∘ said position integrity performance is compared with said position integrity radius by means of said integrity-checking module, ∘ an alert is generated if said position integrity radius is greater than said position integrity performance.