What is lost during a Dual GEN failure?

In the event of a Dual Generator (GEN) failure in the Pilatus PC-12 NG, the aircraft loses power to all electrical buses, which includes the GEN 1 BUS, GEN 2 BUS, NON-ESSENTIAL BUS, CABIN BUS, MAIN BUS, and AVIONICS 2 BUS. This comprehensive loss of electrical power occurs because the aircraft's electrical system relies on the functioning of both generators to distribute power effectively across all systems. When both generators fail, there is no source of electrical power to continue supporting critical systems and ancillary services that are powered by these buses.

Understanding the role of each bus in the aircraft's electrical architecture is crucial. The Main Bus provides power to essential systems for flight operations, while the GEN Buses are directly tied to the generators themselves. The NON-ESSENTIAL and CABIN Buses support less critical functions that enhance passenger comfort and safety. Thus, in a dual failure scenario, the aircraft's ability to operate normally is severely compromised, leading to the total loss of power to all aforementioned buses, reinforcing the necessity for robust generator function during flight operations.