The Standby Flight Display provides independent backup for which parameters?

The Standby Flight Display serves as an essential backup system within the aircraft, providing critical independent information to the pilot. Its primary focus is on vital parameters that contribute to the safe operation of the aircraft in flight. These typically include performance metrics related to the operation of the aircraft's engines, fuel levels, and drive systems. Access to this data is crucial, especially in situations where primary displays may malfunction or fail. The Standby Flight Display ensures that a pilot always retains important operational information necessary for maintaining flight safety and awareness, particularly concerning the performance of the aircraft’s engines and systems crucial for propulsion and fuel management.

The other options focus on different types of information that may not be the primary concern of a backup display. For instance, while altitude and airspeed are critical, they are usually provided by primary flight instruments, and the engine, fuel, and drive systems are the specific parameters that the standby system is designed to back up.