COVER PHOTO: The P&WC Beech 18 test bed on a proving flight from Downsview in 1961. HB109 (later CF-ZWY-X) made 719 flights and logged 1,068 hours testing many PT6 models and propellers. It was retired to l'École aéronautique in St. Hubert after its last flight on June 3, 1980. P&WC Archives (Records and Information Management)

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