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An external vision system (XVS) refers to any of several methods to provide the pilot of an aircraft with a means to see outside the aircraft where traditional windscreens may not be feasible due to the aircraft configuration. An XVS would consist of external sensors, primarily video imagery, which is provided to the pilot(s) in real time via one or more displays intended to augment or replace the windscreen.
In recent[when?] years, other types of vision systems have been introduced primarily on business jets. Both enhanced vision systems (EVS) and synthetic vision system (SVS) have become standard equipment on many larger business jets such as those manufactured by Gulfstream, Bombardier, Dassault, and most recently, Embraer. However, EVS typically provides the pilot(s) with an infrared video image, usually displayed on the head-up display (HUD), which overlays the pilot view of the outside world through the windscreen. SVS is a computer generated version of the outside world created from an onboard terrain database. SVS can also be displayed conformally on the HUD, but it is not real time in that anything that is not part of the static terrain database cannot be displayed.
Both EVS and SVS are primarily intended to improve situational awareness of the flight deck crew, especially at night and in poor visibility weather conditions such as rain, snow, fog, or smoke. XVS is different in that it is intended to provide the flight deck crew a real time view of the outside world in visual meteorological conditions (VMC).
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