What is the primary cause of carbon monoxide poisoning in aviation?

The primary cause of carbon monoxide poisoning in aviation is the entry of exhaust gases into the cockpit through the heater. This situation can occur, especially in piston-engine aircraft, where the heating system draws air from the engine compartment, which may be contaminated with exhaust fumes. Carbon monoxide is a colorless, odorless gas produced by incomplete combustion of carbon-containing fuels, and it can accumulate in enclosed or poorly ventilated areas, leading to potentially severe health risks for pilots and passengers.

The risk is particularly heightened in flight environments where the cabin may not be well-ventilated. Inadequate functioning of the heating system or its exhaust routing can result in dangerous levels of carbon monoxide accumulating in the cockpit, making it a significant safety concern. Pilots must be aware of this hazard and take precautions, such as ensuring proper ventilation and monitoring for signs of carbon monoxide buildup.