With PX Oxygen in the AUTO position, when will the flow of oxygen begin?

When the PX Oxygen is set to the AUTO position, the system is designed to automatically activate the flow of oxygen when the cabin altitude reaches a critical threshold. This threshold is established to ensure that passengers and crew members receive supplemental oxygen needed due to the decrease in available oxygen at higher altitudes.

In this case, initiation of oxygen flow occurs when the cabin altitude exceeds 13,500 feet. At this altitude, physiological effects can begin to take place for unacclimatized individuals, and the risk of hypoxia increases significantly. The system is calibrated to recognize this and activate the oxygen supply to maintain safety and ensure that everyone on board has adequate oxygen supply, thus preventing cognitive and physical impairments that can occur in low-oxygen environments.

Understanding this activation point is crucial for pilots and crew, as it directly relates to the safety protocols and procedures in place for high-altitude operations. Familiarity with these thresholds not only helps in recognizing when the oxygen supply will engage but also in making informed decisions under various flight conditions.