Patents Represented by Attorney R. H. Sproule
  • Patent number: 5003305
    Abstract: A flight path angle symbol is positioned on an aircraft attitude display indicator as a function of either a measured flight path angle or a flight path angle commanded by the pilot. When the aircraft is operating within a selected airspeed, angle of attack, pitch attitude or load factor range, or the difference between measured flight path angle and commanded flight path angle is within a selected range, the symbol is positioned on the display as a function of commanded flight path angle. However when the aircraft is operating outside any of these ranges, the symbols is positioned on the display as a function of the measured flight path angle. To avoid a rapid jump in symbol position when transitioning between measured and commanded flight path angle displays, a phase lag filter is used to attenuate and lag the symbol positioning signal.
    Type: Grant
    Filed: March 6, 1990
    Date of Patent: March 26, 1991
    Assignee: The Boeing Company
    Inventors: Brian D. Kelly, Scott L. Pelton