What is the main purpose of the Standby Flight Display in an aircraft?

The Standby Flight Display primarily serves as a backup instrument to ensure the pilot has access to essential flight data in the event of a primary system failure. This is crucial for maintaining situational awareness and safe aircraft operation, especially during critical phases of flight where information about altitude, airspeed, and attitude is vital.

When primary systems malfunction, the standby display can provide essential readings that inform the pilot about the aircraft's state, enabling them to react promptly and accurately to maintain control and safety. This redundancy is a fundamental aspect of avionics design in aviation, aimed at minimizing the risk of accidents due to equipment failure.

The other options do not align with the primary purpose of the Standby Flight Display; for instance, it does not serve entertainment purposes, nor does it focus solely on navigation instructions or weather data, which are typically managed by other systems.