Commercial Pilot License (CPL) 2026 – 400 Free Practice Questions to Pass the Exam

The key feature of continuous flow oxygen systems used for passengers is that they include a reservoir bag that collects oxygen. This system is designed to provide a consistent supply of oxygen during flight, accommodating the breathing needs of passengers. The reservoir bag helps to store enough oxygen so that it can be delivered effectively when a passenger inhales, ensuring that they receive supplemental oxygen even during the moments when they exhale.

The inclusion of a reservoir bag allows for a more efficient delivery of oxygen, especially at higher altitudes where the atmospheric pressure is lower and the need for supplemental oxygen may increase. This feature is crucial in maintaining adequate oxygen levels for passengers and aiding in their overall comfort and safety during flight.

The other options do not accurately reflect the workings of continuous flow oxygen systems. For instance, while some systems might provide oxygen based on inhalation, the definitive identification of continuous flow systems is their use of a reservoir bag. Operating at a fixed altitude does not apply to this system, as it is designed for variable altitudes. Additionally, continuous flow systems typically do not use a one-time oxygen supply but rather allow for a supply that can be utilized over time as needed.