What is the primary function of a symbol generator in an EFIS?

The primary function of a symbol generator in an Electronic Flight Instrument System (EFIS) is to receive and process input signals from both aircraft and engine sensors, and then to send that data to the appropriate display. This is crucial because the symbol generator translates various sensor data into visual representations, such as flight data or navigation information, allowing pilots to interpret this information quickly and accurately.

In an EFIS, numerous sensors collect data regarding speed, altitude, heading, engine performance, and other critical flight parameters. The symbol generator acts as the central processing unit that consolidates this information and prepares it for visual output on the displays in the cockpit. By doing so, it ensures that pilots receive real-time updates about the aircraft’s status, which is essential for safe and effective flight operational decisions.

Without this processing capability, the display would not be able to present vital information clearly and effectively, impacting flight safety and efficiency. This role is distinct from simply sending data to communication systems or controlling overall system functions, which instead relate to different aspects of the aircraft's operation and communication.