the aircraft to nose over on application of heavy braking. These were factory-optional equipment. Installation of rear-cabin "D" side windows on 120s that were not originally so equipped. Installation of electrical systems on 120s that were not originally so equipped, allowing owners to install an electric starter, more sophisticated avionics and/or lights for night flying. Installation of a more powerful engine. A popular conversion today is to replace the original C-85 or C-90 with a 100 hp (75 kW) Continental O-200. A kit is available to install a Lycoming O-320 but this conversion is less prevalent due to a roughly 100 lb (45 kg) weight penalty and a sharp increase in fuel consumption. Operators Military Guatemalan Air Force Nicaraguan Air Force Specifications (Cessna 140) See also References External links AVweb's Cessna 120/140 Review, an extensive article on the history and features of the type 140 High-wing aircraft Single-engined tractor aircraft 1940s United States civil utility aircraft Aircraft first flown in 1945