Which bus is NOT affected by a GEN 1 or GEN 2 failure?

The essential bus is designed to ensure that vital flight instruments and systems remain operational even in the event of generator failures. In the Pilatus PC-12 NG, the essential bus is supplied with power from both generators, which provides a redundancy that protects critical systems. When either GEN 1 or GEN 2 fails, the essential bus will still receive power from the operational generator.

This design feature allows pilots to rely on their essential instruments and systems during critical phases of flight or in emergencies, making it a fundamental aspect of the aircraft's electrical architecture. Therefore, regardless of which generator fails, the essential bus remains unaffected and continues to operate, ensuring the pilot has the necessary information and control over essential functions.

In contrast, the other buses may not have this level of redundancy, making them susceptible to generator failures.