What is the function of the gear warning system in the Pilatus PC-12 NG?

The gear warning system in the Pilatus PC-12 NG serves a crucial safety function by alerting the pilot if the landing gear is not down and locked while the aircraft is in a landing configuration. This system is vital during the landing phase, as improper gear configuration can lead to catastrophic results if the aircraft attempts to land without the gear extended.

By monitoring the position of the landing gear, the system ensures that the pilot is aware of the gear's status, effectively preventing situations where the aircraft might land gear-up. The alert typically consists of both visual and audible warnings, making it difficult for a pilot to overlook this critical piece of information during one of the most critical phases of flight.

In contrast, the other options do not pertain to the primary role of the gear warning system. The indication of flap deployment, monitoring fuel levels, and alerting the pilot of engine performance issues are managed by separate systems designed specifically for those functions. Each of these systems is important for safe operation, but they do not overlap with the essential task of ensuring the landing gear is properly configured for landing.