What is one effect of not using the required oxygen above 14,000 feet?

Not using the required oxygen above 14,000 feet can lead to potential hypoxia, which is a condition that occurs when the body does not get enough oxygen. At higher altitudes, the atmospheric pressure decreases, resulting in a lower partial pressure of oxygen available for breathing. This reduced availability can impair the body's ability to function properly, leading to symptoms such as dizziness, confusion, loss of coordination, and impaired judgment.

Since the body is not receiving adequate oxygen to sustain normal physiological functions at this altitude without supplemental oxygen, hypoxia can quickly become a serious issue. It is crucial for pilots and crew members to be aware of the effects of high altitude on oxygen levels and to use supplemental oxygen as required to maintain safe operational conditions. This is especially important in aviation where cognitive and physical performance are critical for safe flight operations.