The event took place on 22nd December when the aircraft, C-FSNQ was operating a ferry flight from Pinal Airpark Marana, Arizona where the aircraft had been in temporary storage, to one of Air Canada's main hubs, Pierre Elliott Trudeau International Airport in Montreal.
The jet was in the early stages of the flight when things started to go wrong, despite the jet having a full check on the ground, the crew had a number of warnings, regarding low hydraulic pressure from the left engine and then had warnings of a fuel imbalance from the left-hand wing.
According to Air Canada, the crew "received an engine notification and, according to the standard operating procedure for such a situation, they decided to shut down an engine" before rerouting to Tucson, Arizona.
After burning fuel, the crew landed on runway 11L at Tucson around 80 minutes after departure. The Canadian TSB reported the aircraft was brought to a stop, inspected by safety vehicles and was subsequently escorted to the apron.
The heightened level of scrutiny surrounding the Boeing 737 MAX's return to service ensured this story made it to many mainstream media platforms, sites and papers. Yet, this was a ferry flight, with just the crew onboard and therefore no passengers safety had been impacted. Of course, it shouldn't have happened, the pressure was checked on the ground, as part of the 'wake-up' tests and checks, but these two issues are not related the causes of the two disasters that cost the lives of over 340 people which led to the nearly two-year grounding of the MAX jets.
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