What is a requirement regarding passenger oxygen masks when preparing for takeoff?

The requirement that the number of oxygen masks must equal the number of passengers is based on safety regulations that ensure every passenger has access to supplemental oxygen in the event of cabin depressurization. This stipulation is crucial because it guarantees that in an emergency situation, such as a sudden loss of cabin pressure, all passengers can receive oxygen to breathe adequately.

Having an adequate number of oxygen masks ensures that both the passengers and crew are prepared for situations that may compromise cabin conditions. This adherence to regulations not only fosters passenger safety but also aligns with the operational standards set by aviation authorities to mitigate risks during flights. Properly equipping the aircraft with the correct number of oxygen masks is a fundamental component of flight safety protocols.