An electrooptical aircraft flight instrument that accepts angle of attack input signals and displays upon a transparent screen in the pilot's normal line of sight and focused at infinity, the actual flight path of the aircraft through the air mass.
A display instrument for projecting aircraft flight data upon a transparent screen into the pilot's normal line of sight, wherein an optical objective projects images of luminous objects focused at infinity onto a combining glass; the luminous objects which represent the flight data to be displayed being carried out by means of electro-optical transducers such as electroluminescent diodes supplied by an associated supply circuit; servo means responsive to output signals of airborne sensor devices controlling the displacement of, and the selective supply to, the diodes representative of variable flight data.
