Carbon Monoxide Poisoning

Carbon Monoxide

Carbon monoxide (CO) is a colourless, odourless and highly toxic gas produced by incomplete combustion.

In light aircraft, carbon monoxide can enter the cockpit or cabin from engine exhaust gases, particularly where an exhaust system is also used to provide cabin heat.

Carbon monoxide enters the bloodstream through the lungs and reduces the blood's ability to carry oxygen around the body.

Symptoms of Carbon Monoxide Poisoning

Early or mild symptoms may include:

• headache;
• nausea;
• dizziness;
• tiredness or lethargy;
• shortness of breath, particularly on effort;
• poor concentration; and
• sluggish thinking or mental confusion.

As exposure increases, symptoms may progress to:

• impaired judgement;
• blurred vision;
• drowsiness;
• loss of coordination;
• unconsciousness; and
• eventually, death.

Because carbon monoxide poisoning reduces the oxygen available to the body, its symptoms can be similar to hypoxia.

Carbon Monoxide in Flight

If the cabin heat is on and a pilot begins to experience headache, nausea, unusual tiredness, poor concentration or other unexplained symptoms, carbon monoxide contamination should be suspected.