Method and avionics computer for determining an anchor point of a terminal segment on the basis of a missed approach point, for a non-precision approach

An avionics computer, being a flight management system, for determining an anchor point of a terminal segment of a virtual path for a non-precision Flight Management System (FMS) Landing System (FLS) approach mode of an aircraft, with a view to landing the aircraft on a runway of an aerodrome, said terminal segment starting at a final approach fix and ending at said anchor point, said avionics computer comprising at least a processing unit and a navigation database,

• wherein the processing unit is configured:
• to compare a first altitude with a threshold altitude, the first altitude corresponding to an altitude of a missed approach point relative to the runway contained in the navigation database of the avionics computer, the threshold altitude being equal to a sum of a second altitude corresponding to the altitude of the runway and of a threshold crossing height;
• to determine, depending on a comparison, a terminal point that has an altitude equal to said threshold altitude and that forms, with a position of the missed approach point, a straight line segment that has a slope equal to a slope of the straight line segment defined by the missed approach point and the final approach fix, said terminal point being capable of being used as said anchor point;
• and
• to execute an FLS approach calculated between at least the final approach fix altitude and the terminal point using the slope of the straight line segment to land the aircraft on the runway of the aerodrome.

A set of avionics systems for implementing a non-precision Flight Management System (FMS) Landing System (FLS) approach mode of an aircraft, with a view to landing the aircraft on a runway of an aerodrome, said set of avionics systems comprising at least a flight management system configured to use a virtual path comprising a terminal segment that is defined with respect to an anchor point,

• wherein the flight management system comprises at least one avionics computer for determining the anchor point, the at least one avionics computer for determining the anchor point for the FLS approach mode, said terminal segment starting at a final approach fix and ending at said anchor point, said at least one avionics computer comprising at least a processing unit and a navigation database, wherein the processing unit is configured:
• to compare a first altitude with a threshold altitude, the first altitude corresponding to an altitude of a missed approach point relative to the runway contained in the navigation database of the avionics computer, the threshold altitude being equal to a sum of a second altitude corresponding to the altitude of the runway and of a threshold crossing height;
• to determine, depending on a comparison, a terminal point that has an altitude equal to said threshold altitude and that forms, with a position of the missed approach point, a straight line segment that has a slope equal to a slope of the straight line segment defined by the missed approach point and the final approach fix, said terminal point being capable of being used as said anchor point;
• and
• to execute an FLS approach calculated between at least the final approach fix altitude and the terminal point using the slope of the straight line segment to land the aircraft on the runway of the aerodrome, and
• wherein the flight management system is configured to use the anchor point determined by said avionics computer as said anchor point of the terminal segment of the virtual path.