What is a major function of the Standby Flight Display?

The major function of the Standby Flight Display is to provide essential flight information. This display serves as a critical backup system, ensuring that a pilot has access to vital data such as altitude, airspeed, attitude, and heading in the event that the primary flight display fails. By maintaining a reliable source of fundamental flight metrics, the Standby Flight Display enhances flight safety and situational awareness, allowing pilots to continue to operate the aircraft effectively even under adverse conditions or equipment malfunctions.

Other functions typically handled by various avionics systems, such as calculating fuel consumption or updating navigation maps, are not the primary purpose of the Standby Flight Display. Instead, those processes are managed by specialized systems designed for those functions. Similarly, displaying entertainment options does not align with the intended role of a flight display, which is focused on critical flight information rather than pilot or passenger entertainment.