What is carbon monoxide poisoning in aircraft and what are the preventive measures?

• A. CO from exhaust can enter cabin; symptoms include headache; prevent by proper cabin seals and ventilation and monitoring for leaks.
• B. CO is not a concern in small airplanes.
• C. CO poisoning only from smoking.
• D. CO poisoning is prevented by increasing cabin altitude.

Answer: (A)

Carbon monoxide poisoning in an aircraft occurs when exhaust gases leak into the cabin air. CO binds to hemoglobin far more readily than oxygen, so even when there’s enough oxygen in the air, the blood’s ability to deliver oxygen to tissues is reduced. This can lead to headache, dizziness, fatigue, nausea, and confusion, and symptoms can appear relatively quickly, especially at altitude where the cabin environment relies on ventilation and air circulation systems.

Preventive measures focus on keeping the air supply clean and well‑ventilated and on detecting leaks early. Maintain and inspect the exhaust system, heater, and cabin air seals to prevent leaks from the engine exhaust into the cockpit and cabin. Ensure proper cabin ventilation with a steady supply of fresh air and effective dilution of any contaminants. Use CO detectors if recommended for the aircraft type and follow maintenance procedures to fix any exhaust or sealing leaks promptly. By controlling the source, maintaining sealing and ventilation, and monitoring for leaks, the risk of CO exposure is minimized.