Abstract: Taxi and slope landing symbology for a helicopter having a main rotor drive shaft and a main rotor hub defining a hub moment, wherein the main rotor drive shaft and the main rotor hub have hub moment limits. The taxi and slope landing symbology comprises a first symbol for providing a symbolic representation of the hub moment limits, and a second symbol for providing a dynamic symbolic representation of the hub moment, wherein the second symbol is disposed in combination with the first symbol to provide a visual cue of the hub moment relative to the hub moment limits.

Abstract: A virtual image display system provides video displays based upon virtual images of the external world having synchronized structural outlines superimposed on the video displays to a pilot operating an aircraft such as a helicopter in non-visual flight conditions.

Abstract: A power management symbology (PMS) display system for helicopters that provides a continually updated, combined analog/digital symbolic display of selected status information vis-a-vis the helicopter powerplant. The PMS display system includes a multi-dimensional, continuously updated, combined analog/digital display symbol that is optimized for discriminability and compatibility with respect to the pilot's visual system.

Abstract: Images are provided to a pilot in an aircraft overflying the earth by means of a helmet mounted display system. The position and attitude of the aircraft with respect to the earth and the attitude of the helmet with respect to the aircraft are monitored in order to convert a plurality of stored earth position signals into helmet coordinates. Earth points which are viewable by the pilot are displayed using symbolic images thereof such that the symbolic images coincide, from the pilot's point of view, with the actual positions of the viewable points on the earth.