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Incident: Canada B38M over Pacific on Dec 24th 2018, hydraulic quantity decreasing

By Simon Hradecky, created Friday, Dec 28th 2018 20:48Z, last updated Friday, Dec 28th 2018 20:48Z

An Air Canada Boeing 737-8 MAX, registration C-FSCY performing flight AC-535 from Vancouver,BC (Canada) to Kahului,HI (USA) with 167 passengers and 6 crew, was enroute over the Pacific Ocean about 2 hours into the flight when the crew noticed the hydraulic quantity A had reduced to 67% and was degrading. The crew consulted with dispatch and maintenance, a decision to continue the flight was reached, the crew should report the situation within an hour again. 30 minutes later the quantity had reduced another percent, and another 30 minutes later the quantity had reduced to 65%. In the following discussion with dispatch and maintenance the decision was made to return to Vancouver. The aircraft landed safely back in Vancouver about 3 hours after the decision to return.

The Canadian TSB reported the operator's maintenance is investigating the causes.

A replacement Boeing 737-8 MAX registration C-FSOC reached Kahului with a delay of about 10 hours.