What is the operating range for the cabin altitude warning system?

The cabin altitude warning system in the King Air 350 is designed to monitor the cabin altitude and alert the crew when it exceeds a certain level that could pose a risk to passengers and crew due to reduced oxygen availability. The correct operating range for this warning system activates above 10,000 feet.

This threshold is critical because, at altitudes above 10,000 feet, the risk of hypoxia, a condition caused by insufficient oxygen, increases for passengers who may not be using supplemental oxygen. The system serves as an important safety feature, prompting the crew to take necessary actions to maintain safe cabin pressure and ensure the well-being of everyone on board.

Choosing a lower altitude such as under 10,000 feet would not be appropriate, as the physiological effects of altitude generally do not begin to cause significant concerns until above this mark. This understanding is crucial for flight safety and in managing the cabin environment effectively during operations.