What must pilots ensure regarding oxygen supply when the cabin altitude exceeds 14,000 feet?

When the cabin altitude exceeds 14,000 feet, pilots must ensure that passengers receive oxygen masks. This requirement is in place because at high altitudes, the partial pressure of oxygen decreases, which can lead to hypoxia, a condition where the body does not get enough oxygen. Providing oxygen masks to passengers is crucial for maintaining their safety and ensuring that they can breathe adequately during flight.

In this context, having the appropriate safety measures in place for passengers is a fundamental responsibility of the flight crew, as the effects of altitude can impact cognitive and physical functions rapidly. Consequently, ensuring that passengers have access to supplemental oxygen is a critical step in maintaining the safety and well-being of everyone onboard the aircraft during potential emergency situations related to cabin altitude changes.