Source: Simon Hradecky | www.avherald.com

An Air Canada Embraer ERJ-190, registration C-FMZR performing flight AC-1037 from Toronto,ON (Canada) to Denver,CO (USA) with 87 people on board, was climbing out of Toronto when both flight and cabin crew noticed an unusual odour. The flight crew declared PAN PAN and returned to Toronto for a safe overweight landing.

The Canadian TSB reported maintenance found the left hand engine’s (CF34) oil had been over serviced. The oil quantity was corrected, subsequent engine runs showed no further odours. An overweight landing inspection was carried out before returning the aircraft to service.