Aeromedical Factors

Synthetic vision system Enhanced vision system Figure 17-23. Synthetic and enhanced vision systems. Synthetic Vision System obvious advantages of SVS are that the digital terrain image A Synthetic Vision System (SVS) is an electronic means remains on the pilot’s display regardless of how poor the to display a synthetic vision image of the external scene visibility is outside. topography to the flight crew. [Figure 17-24] It is not a real-time image like that produced by an EFVS. Unlike An SVS image can be displayed on either a head-down EFVS, SVS requires a terrain and obstacle database, a display or head-up display (HUD); however, to date, SVS precise navigation solution, and a display. The terrain has only been certified on head-down displays. Development image is based on the use of data from a Digital Elevation efforts to display a synthetic image on a HUD are currently Model (DEM) that is stored within the SVS. With SVS, the underway as are efforts that would combine SVS with a real- synthetic terrain/vision image is intended to enhance pilot time sensor image produced by an EFVS. These systems are awareness of spatial position relative to important features known as Combined Vision Systems. While SVS is currently in all visibility conditions. This is particularly useful during certified as an aid to situation awareness only, the FAA critical phases of flight, such as takeoff, approach, and and aviation industry are working on defining operational landing, where important features, such as terrain, obstacles, concepts and airworthiness criteria that would enable SVS runways, and landmarks, may be depicted on the SVS to be used for operational credit in certain low visibility display. [Figure 17-25] During approach operations, the conditions. Other future enhancements to SVS displays could include integrating ADS-B to display traffic information. Enhanced Flight Vision System Enhanced Vision (EV) or Enhanced Flight Vision System (EFVS) is an electronic means to provide a display of Figure 17-24. SVS system. Figure 17-25. Night time SVS system. 17-28