Certified Flight Instructor - Flight Instructor Airplane Practice Exam

What type of oxygen system is most commonly found in general aviation aircraft?

1. Demand.

2. Continuous flow.

3. Pressure demand.

4. Liquid oxygen system.

The correct answer is: Continuous flow.

The most commonly found type of oxygen system in general aviation aircraft is the continuous flow system. This system is designed to deliver a steady stream of oxygen to the pilot and passengers, making it relatively straightforward to use. In flight, when an aircraft ascends to altitudes where the oxygen levels decrease, continuous flow systems allow for a constant provision of oxygen, which is essential for maintaining proper physiological function and preventing hypoxia. Continuous flow systems are generally simpler and lighter than other systems, making them ideal for the typically lower altitude and shorter duration flights associated with general aviation. Additionally, this system does not require special equipment or masks to regulate the pressure, which may complicate use, especially in smaller aircraft where space is limited. While demand and pressure demand systems have specific advantages like delivering oxygen only when the user inhales—thus conserving oxygen—they are more commonly found in commercial or high-altitude flying scenarios. Liquid oxygen systems, while effective, are less prevalent in general aviation due to complexities associated with handling and storage. Hence, the continuous flow system is the most practical and frequently utilized option in this context.