Abstract: A method for determining the distance of an aircraft from an offset runway during a landing by offset approach, the offset runway being situated at a distance D from a main runway equipped with at least one elevation beacon, comprises at least the following steps: determining the height h at which the aircraft is situated, height determined with respect to a point T1 of the offset runway, height measured by a radioaltimeter with which the aircraft is equipped, determining the angle of elevation ? of the MLS mode by using the information of the elevation beacon provided by an elevation beacon with which said main runway is equipped, determining the value of the distance ? of the aircraft from the azimuth beacon (10) by using the following formula ? = ( h Tan ? ( ? ) - D ? ? 2 Cos ? ( ? ) ) 2 + h 2 , and, using said distance ? to obtain a point of location of the aircraft in an offset runway reference frame.

Abstract: 1—Method for determining the distance of an aircraft from an offset runway (15) during a landing by offset approach, the offset runway (15) being situated at a distance D from a main runway (11) equipped with at least one elevation beacon (12), characterized in that it comprises at least the following steps: determining the height h at which the aircraft (1) is situated, height determined with respect to a point T1 of the offset runway (15), height measured by a radioaltimeter with which the aircraft is equipped, determining the angle of elevation ? of the MLS mode by using the information of the elevation beacon (12) provided by an elevation beacon (12) with which said main runway is equipped (11), determining the value of the distance ? of the aircraft from the azimuth beacon (10) by using the following formula ? = ( h Tan ? ( ? ) - D ? ? 2 Cos ? ( ? ) ) 2 + h 2 , using said distance ? to obtain a point of location of the aircraft in an offset runway reference frame (1