Regarding passenger oxygen needs, what is true for a pressurized aircraft at FL 270?

At flight levels such as FL 270, the air pressure outside the aircraft is significantly lower than at sea level, which means that the oxygen available in the cabin air diminishes. In the event of depressurization, the cabin altitude can rise rapidly, potentially leading to hypoxia (a deficiency in the amount of oxygen reaching the tissues). In such cases, it is crucial that each passenger has access to supplemental oxygen to ensure their safety and well-being.

Providing each passenger with access to oxygen allows for immediate support if the cabin altitude exceeds safe levels and helps prevent physiological effects associated with a lack of oxygen. This requirement aligns with aviation regulations and safety practices, which underline the need for oxygen provision in scenarios where rapid cabin depressurization could occur.