Display instrument for aircraft for showing the aircraft orientation, particularly the rolling and pitching position or the flight path angle

Claim 1

A display system for aircraft for showing the attitude comprising a projection system including devices for displaying symbol features representative of the aircraft position in the exterior view of a pilot, said symbol features including: an artificial horizon symbol which is stabilized fixed to the earth for displaying the artificial horizon; an airplane symbol which represents the aircraft; and an information symbol concentrically surrounding the airplane symbol in the form of a variable circular curve of a circular ring segment; wherein the information symbol having an arc length, has a radial center axis, the information symbol changing in size as a function of measured values depending on at least one of the roll angle (φ) with respect to its angular position, the pitch position (θ) relative to the dimension of the circular ring segment, and a flight path angle relative to a course of the aircraft; wherein the relative position of the airplane and information symbol with respect to one another provide a flight path indication with respect to the pilot's exterior view of the outside world; and wherein the arc length of the information symbol amounts to 180°-2 times the flight path angle.