Texas Turbine Conversions DHC-3 Otter
Airplane modifier Texas Turbine Conversions has begun flight testing of its conversion of the de Havilland DHC-3 Otter. The modification includes the replace-ment of the original 600-hp, nine-cylinder Pratt & Whitney radial with an AlliedSignal/Garrett TPE331-10 turboprop engine flat-rated to 900-horsepower. While the airframe is limited to a 125-knot air-speed, the additional power helps the Otter climb better and fly at max speeds to much higher altitudes than it could with the radial. The engine swap saves 400 pounds, which translates into a better useful load, and gives operators a greatly increased TBO - up to 5,400 hours - over the P&W radial.