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Which of the following situations may cause a fume event aboard an aircraft?
  • A
    Burning interior, spilled anti-ice fluid, forbidden items in carry-on baggage.
  • B
    Overheating brakes after gear retraction, damaged pump in the air cycle machine, loss of pressurisation.
  • C
    Unmixed bleed air in air conditioning ducts, APU fire, failure of hydraulic flight controls.
  • D
    Engine fire, smoking in toilets, electrical short-circuits.

Sources and types of on-board fumes​​​​​​

Potential contaminants in the ventilation supply air:
  • De-icing and/or anti-icing fluid
  • Electrical faults
  • Engine compressor wash
  • Engine oil
  • Exhaust (aircraft or ground vehicles)
  • Fuel
  • Hydraulic fluid
  • Recirculation fan failure
 Items in the cabin and/or flight deck that can be sources of fumes:
  • Carry-on baggage
  • Cleaning products
  • Disinfectants
  • Disinsectants
  • Food items
  • Galley equipment
  • Lavatories
"Burning interior" and "forbidden items in carry-on baggage" => in case of fire on board an aircraft, some cabin furnishings and plastic or foam upholstery give off poisonous fumes as they are heated. There is also the risk that luggage may contain lethal items which may not have been detected during routine screening.

"Spilled anti-ice fluid" => Anti-icing fluid gives off fumes which, if allowed to enter the fuselage, can be harmful.

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