At what cabin altitude will the overhead passenger O2 masks automatically deploy?

The automatic deployment of the overhead passenger oxygen masks occurs at a cabin altitude of 14,500 feet, with a tolerance of plus or minus 500 feet. This altitude is significant as it is the threshold where the FAA requires supplemental oxygen for passengers who will be exposed to such conditions for more than 30 minutes.

The deployment mechanism is designed to ensure passenger safety in the event of a sudden loss of cabin pressure, which could lead to hypoxia. By activating at 14,500 feet, the system provides passengers with immediate access to oxygen masks, allowing them to maintain adequate oxygen levels until the aircraft can descend to a safer altitude.

This altitude is aligned with regulatory requirements and standard practices in aviation for passenger safety, making it the correct choice in this context.