Pratt & Whitney Canada PT6A-42 is a PT6A-family free-turbine turboprop variant rated at 850 shaft horsepower (633.8 kW). The PT6A architecture uses reverse flow, a two-shaft gas generator and independent free power turbine, with a multi-stage compressor and reduction gearbox; FAA material groups PT6A-42 with PT6A-41, -52, and -61 in the Beech 200 series. The exact variant identity is preserved independently of aircraft installation records.