How is the Pitot-static system used in the Pilatus PC-12 NG?

The Pitot-static system in the Pilatus PC-12 NG is vital for measuring airspeed and altitude, which are crucial parameters for flight operation and safety. This system consists of two key components: the Pitot tube, which measures dynamic pressure, and static ports, which measure ambient atmospheric pressure.

The pressure from the Pitot tube is used to calculate the aircraft's airspeed, while the static pressure is utilized to determine altitude and vertical speed. Both of these readings are essential for pilots to maintain control of the aircraft, monitor performance, and navigate effectively. This is why option C is the correct answer, as it accurately reflects the primary function of the Pitot-static system in the context of flight data instrumentation.