Method contributing to making safe a synthetic graphics representation of the view outside an aircraft

Abstract

A method of contributing to making safe a synthetic vision display of an aircraft for displaying on viewing means an at least partial view in perspective of the environment of the aircraft together with piloting symbology. During the method, at least one check point (P, P, P) is defined that is situated in the environment and that co-operates with a reference point (Pr) of the aircraft to form a first straight line (D). Thereafter, a first display function (F) is used to calculate display coordinates (a,b), (a,b), (a,b) for each check point (P, P, P) on the viewing means, and then the inverse (F)of a second display function (F) is used together with the display coordinates (a,b), (a,b), (a,b) to calculate a second straight line (D) passing through the reference point (Dr). Finally, the first and second lines (D, D) corresponding to a common check point (P, P, P) are compared in order to define whether the synthetic vision display is trustworthy.