Investigators said WestJet and its partners have added inspections after two other engines were found with fractured compressor rotor blades.
The Transportation Safety Board released its investigation report Tuesday regarding a March 2, 2023, incident where a fractured rotor blade forced a WestJet Encore flight to divert to Kelowna shortly after departing Kamloops Airport.
Carrying 78 people—74 passengers and four crew members—the WestJet flight declared an emergency after an engine fire warning sounded during the climb to cruising altitude. The crew shut down the affected engine and landed safely on one engine at Kelowna International Airport.
Investigators determined a fractured rotor blade in the engine compressor caused a power surge; the engine control system subsequently increased fuel flow, igniting a fire in the exhaust stream manufactured by Pratt & Whitney Canada.
Following the incident, Pratt & Whitney Canada, Havilland Aircraft, and WestJet implemented comprehensive inspection, monitoring, and software changes to mitigate the risk of future rotor blade failures.
Subsequent WestJet inspections identified two additional engines with fractured compressor rotor blades, prompting further fleet-wide safety measures and reinforcing the scope of the structural defect across the airline's aircraft.