On 31 July 2015 a Bombardier DHC8-400 crew detected the presence of abnormal fumes on the flight deck and were then advised by the cabin crew that the forward toilet smoke alarm had been activated and that smoke was visible in the cabin. Smoke then appeared in the flight deck and a PAN was declared. A diversion to Dublin was subsequently made. The Investigation found that debris from a fractured bearing washer had compromised engine oil seals leading to fumes/smoke entering the aircraft through the air conditioning system. The manufacturer has since introduced a new infinite life' bearing washer.