Which items are powered under the First Level of Integrity?

The First Level of Integrity in the Pilatus PC-12 NG refers to a specific set of critical systems that are maintained to ensure safe operation of the aircraft. The correct answer identifies the ESSENTIAL BUS and AVIONICS 1 BUS as powered systems under this level.

The ESSENTIAL BUS powers crucial instruments necessary for basic operations, such as engine instruments, navigation displays, and other vital systems that need to remain operational during critical flight phases. The AVIONICS 1 BUS is also essential, as it typically powers primary avionics equipment that is necessary for navigation and communication. Together, these two buses ensure that pilots have the necessary information and tools available in case of a system failure or other emergency situation.

Understanding the importance of these buses is crucial for safe flight operations. They represent the backbone of the aircraft's critical systems, allowing the crew to maintain control and situational awareness even under less than ideal conditions.