What procedures should be followed in the event of cabin depressurization in the Pilatus PC-12 NG?

In the event of cabin depressurization in the Pilatus PC-12 NG, the proper procedure is to employ emergency oxygen masks and descend to a safe altitude. This response is critical because when cabin depressurization occurs, oxygen levels can drop rapidly, leading to hypoxia—a state where the body does not receive enough oxygen.

Using the emergency oxygen masks provides immediate supplemental oxygen to the crew and passengers, helping to prevent hypoxia, especially during rapid altitude loss. Descending to a safe altitude, typically below 10,000 feet, ensures that the air pressure is sufficient for breathable air without supplemental oxygen, allowing for a safer environment until the situation can be managed.

The other options do not adequately address the immediate physiological risks associated with cabin depressurization. Activating emergency lighting without taking action to provide oxygen does not help with the lack of breathable air. Notifying air traffic control is important for situational awareness, but it does not resolve the urgent need for oxygen, and circling the airport may prolong exposure to low oxygen levels. Increasing cabin pressure slowly is not feasible in an emergency depressurization scenario and would not effectively address the immediate needs of the passengers and crew.