WS1401 - Incident: Westjet B738 enroute on Jun 2nd 2022

A Westjet Boeing 737-800, registration C-GWSZ performing flight WS-1401 from Las Vegas,NV (USA) to Calgary,AB (Canada) with 145 passengers and 6 crew, was enroute at FL370 about one hour into the flight when the crew received an indication that the horizontal stabilizer was out of trim. The crew worked the related checklists, descended the aircraft to FL280 out of RVSM airspace and continued to Calgary declaring PAN PAN with approach. The aircraft landed safely on Calgary's runway 17L.

The Canadian TSB reported maintenance reset the horizontal stabilizer trim logic with no faults found. A BITE test returned maintenance message 22-11177. A SPD/STB trim test was performed and was passed.