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

The type of oxygen mask that can maintain blood oxygen levels nearly normal up to 25,000 feet is the continuous flow oxygen mask. This mask provides a steady stream of oxygen to the user, which is essential as altitude increases and the availability of oxygen in the atmosphere decreases.

At higher altitudes, the partial pressure of oxygen decreases, which can lead to hypoxia if not managed properly. The continuous flow mask delivers oxygen continuously, compensating for this decrease by ensuring that a consistent supply of oxygen is available to the pilot or passenger. This is crucial for maintaining adequate blood oxygen saturation levels and ensuring cognitive function during flight.

Other oxygen delivery systems, like the pressure-demand mask, are designed for higher altitude environments, typically above 25,000 feet, where they can provide oxygen under pressure to effectively maintain oxygenation. The re-breather bag mask and diluter-demand mask are also less effective than the continuous flow mask at lower altitudes, as they depend on the user's breathing pattern and the environmental conditions. Therefore, at altitudes up to 25,000 feet, the continuous flow oxygen mask stands out as the most effective option for maintaining adequate oxygen levels.