At what altitude does the Outflow Valve close if cabin altitude exceeds a certain limit?

The Outflow Valve in the Pilatus PC-12 NG is designed to help regulate cabin pressure and maintain a safe cabin altitude for the passengers and crew. When cabin altitude exceeds a specified limit, which is set to prevent discomfort and ensure safety, the Outflow Valve is programmed to close to mitigate further pressure changes. In the case of the PC-12 NG, this threshold is 14,500 feet.

Closing the Outflow Valve at this altitude prevents any further increase in cabin altitude, effectively protecting the occupants from potential hypoxia and ensuring that the cabin altitude remains within a manageable range. This automatic response is a critical safety feature, particularly in high-altitude flight operations, where managing cabin pressure can be challenging. Therefore, understanding the operational behavior of the Outflow Valve is essential for pilots to ensure passenger safety and comfort during flight.