Carbon Monoxide Poisoning in Aircraft

What Is Carbon Monoxide Poisoning in Aviation?

Carbon monoxide poisoning aviation risks stem from incomplete combustion of carbon-based fuels, such as avgas, producing CO as a byproduct. In aircraft, especially those with piston engines, cabin heating systems that route air over exhaust manifolds can allow CO to leak into the cockpit if the exhaust system is compromised.

How CO Affects the Body

CO binds to haemoglobin with an affinity about 200 times greater than oxygen, forming carboxyhaemoglobin. This blocks oxygen transport, causing anaemic hypoxia even if the air contains normal oxygen levels. The body receives no warning—there's no urge to breathe faster, so symptoms develop insidiously.

Signs and Symptoms in Pilots

Common co symptoms pilot should watch for include:

• Headache
• Weakness
• Nausea
• Muscle pain
• Dizziness These often resemble flu, but without fever. At higher exposures, confusion, impaired judgement, and loss of consciousness can occur rapidly.

Immediate Actions and Treatment

On suspicion of carbon monoxide poisoning in aircraft, take these steps:

• Use 100% oxygen if available
• Turn off cabin heating
• Open fresh air vents
• Stop smoking
• Land as soon as possible On the ground, treatment involves continued oxygen therapy and medical observation, as recovery can take days.

Sources of Toxic Fumes in Aircraft

Besides CO, burning aircraft materials like electrical insulation, seat foam, and panelling can release other toxic gases (e.g., hydrogen cyanide). Fume events may present with visible smoke, odd smells, or irritation, and can cause incapacitation.

Prevention and Detection

Install and regularly check carbon monoxide detectors—either passive (colour-change) or electronic alarms. Early detection is critical for pilot safety carbon monoxide prevention.