Transport Canada is giving operators of the A220 a year to fix drains in the front of the aircraft that allowed rainwater to drip into the forward avionics bay and caused an engine to shut down. The aircraft was taxiing at the time. The water got in through overflowing drains around the main entry door. The door was open during a rain storm and when the drains backed up, the water was allowed to drip into the avionics bay. It caused a circuit breaker to trip, shutting down the engine.
Transport Canada has specified the fix, which involves blocking off some of the drains and tubing. The operator of the aircraft and the location where the engine shutdown occurred were not included in the report. Air Canada is the only Canadian operator of the aircraft but the AD will affect any foreign operators who wish to fly to Canada.