Private Pilot Private Exam

What contributes to the increased susceptibility to carbon monoxide poisoning?

1. Decreased altitude

2. Extreme weather conditions

3. Increased altitude

4. Long flight durations

The correct answer is: Increased altitude

Increased altitude contributes to the heightened risk of carbon monoxide poisoning primarily due to the environmental conditions found at higher elevations. At altitude, the partial pressure of oxygen decreases, which can lead to hypoxia—an insufficient supply of oxygen to the body. The presence of carbon monoxide (CO) in the cabin, often resulting from engine exhaust in poorly ventilated aircraft, compounds the danger. When flying at higher altitudes, the body's ability to absorb oxygen is already compromised, making it more difficult for the body to tolerate the presence of carbon monoxide. This situation is exacerbated due to the fact that CO binds with hemoglobin in the blood much more effectively than oxygen, reducing the amount of oxygen that can be transported to vital organs. While decreased altitude, extreme weather conditions, and long flight durations can impact overall flight safety and health, they do not have the same direct correlation with carbon monoxide absorption and hypoxia as increased altitude does. Thus, it is important for pilots to be vigilant about potential carbon monoxide sources, especially when operating at higher altitudes.