What does the 3D cam in the aircraft control?

The 3D cam in the Pilatus PC-12 NG plays a crucial role in the engine's control system, specifically concerning the integration of power level into the Fuel Control Unit (FCU). This cam helps in modulating the fuel flow to the engine depending on various parameters, allowing the engine to operate efficiently and effectively at different power settings.

By utilizing a three-dimensional cam profile, the system can adjust how much fuel is delivered to the engine based on the altitude, air temperature, and power demand, enhancing overall performance and responsiveness. This integration is essential for smooth engine operation, ensuring the pilot has precise control over the aircraft's performance during various phases of flight.

While each of the other options involves important functions, they do not directly relate to the specific role of the 3D cam in managing fuel delivery in conjunction with power settings.