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What is correct regarding an Enhanced Visual System (EVS)?

  • A
    It combines the static data from a database with the actual data from external sensors to create a visual 3-dimensional (3D) representation of the surroundings of the aircraft.
  • B
    It collects and stores real-time data from external sensors to create a synthetic vision representation of the surroundings of the aircraft.
  • C
    It generates real-time imagery of the surroundings of the aircraft and it is able to digitally detect objects like obstacles to warn the crew.
  • D
    It generates real-time imagery, to display on the PFD or HUD, of the surroundings of the aircraft based on external sensors.

Refer to figure.
Enhanced Vision Systems (EVS) uses external sensors such as infrared cameras to generate a real-time image on the PFD or on the HUD. These infrared camera have a wavelength that best detects runway lights and can distinguish terrain from clouds or air in poor visibility or at night. Its principle of operation is based on sensing different temperatures rather than visible light.

EVS enables lower minima because of the real-time image, thus enhancing the visibility as experienced by the pilot. Even if not used to apply lower minima, the system can be used to increase situational awareness especially at airports that do not have precise system such as an ILS.

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