The Continental IO-520 is a six-cylinder, horizontally opposed aircraft engine produced by Teledyne Continental Motors. First run in 1963 as a development of the IO-346, it has been produced in versions incorporating fuel injection (IO-520), turbo-charging (TSIO-520), and gearing (GTSIO-520).

Design and development

The IO-520 series engines normally produce 285 to 310 hp and are used in numerous aircraft such as certain models of the Bellanca Viking 300 and Super Viking, the Beech Bonanza and Baron, and Cessna 185- 206-, 210-, 310-, and 400-series aircraft. The IO-520 remained in production in 2019. The turbocharged GTSIO-520's most common applications are the twin-engine Cessna 404 and 421, where it is rated at 375 hp. The 'G' prefix indicated the incorporation of propeller reduction gearing.

Variants

IO-520

TSIO-520

GTSIO-520

Applications

• Aero Commander 685 • Beechcraft Bonanza • Beechcraft Baron 58P • Bellanca Skyrocket II • Bellanca Viking (17-30 and 17-30A) • Cessna 185 • Cessna 188 • Cessna 206 • Cessna 207 • Cessna 210 • Cessna 303 • Cessna 310 • Cessna 335 • Cessna 340 • Cessna 402 • Cessna 404 • Cessna 414 • Cessna 421 • Meyers 200D • Navion H Rangemaster • Piper PA-46-310P Malibu • St-Just Super-Cyclone • Tecnam P2012 Traveller • Viper Aircraft Viperfan • Wise GT-400

Specifications (GTSIO-520-D)