AC319 - Incident: Canada B788 near Toronto on Oct 18th 2021

An Air Canada Boeing 787-8, registration C-GHPY performing flight AC-319 from Montreal,QC to Calgary,AB (Canada) with 245 people on board, was enroute at FL400 about 350nm northwest of Toronto,ON (Canada) when the crew received a low engine oil indication for the left hand engine (GEnx) and decided to divert to Toronto for a safe landing about 50 minutes later.

The Canadian TSB reported maintenance found the left "engine oil cap lanyard trapped below cap preventing a good seal and allowing the engine oil to leak out under pressure." The area was cleaned and the oil quantity serviced.