A fume event occurs when bleed air used for cabin pressurisation and air conditioning in a pressurised aircraft is contaminated by fluids such as engine oil, hydraulic fluid, anti-icing fluid, and other potentially hazardous chemicals. == How cabin pressurisation works == Because airliners fly at very high altitudes, the cabin must be pressurised to provide a safe quantity of breathable oxygen to passengers and crew.
A fume event occurs when bleed air used for cabin pressurisation and air conditioning in a pressurised aircraft is contaminated by fluids such as engine oil, hydraulic fluid, anti-icing fluid, and other potentially hazardous chemicals. == How cabin pressurisation works == Because airliners fly at very high altitudes, the cabin must be pressurised to provide a safe quantity of breathable oxygen to passengers and crew.
Source: Wikipedia "Fume event" · CC BY-SA 4.0
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