AAIB investigation to Airbus A320-214, G-EZOI
In-flight fumes event, en route from Edinburgh Airport to Bristol Airport, 25 February 2019.
Summary:
A louder than usual noise was observed from an avionics vent fan before flight. During flight the noise increased and vibration became apparent. The crew then noticed a strong burning smell so they donned their oxygen masks and diverted the flight. An ECAM message, associated with an avionics ventilation system fault, was generated and the crew performed the associated actions.
A subsequent investigation revealed the cause of the event to be worn bearings in the avionics extract fan. The fan manufacturer and the aircraft manufacturer both took safety action to prevent similar incidents in future.
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