and first certified on 17 December 1956. Four seat high wing light aircraft powered by a Continental O-470-K, landplane gross weight and first certified on 22 August 1958. Four seat high wing light aircraft powered by a Continental O-470-L or O-470-R, landplane gross weight and first certified on 8 July 1959. 180D Four seat high wing light aircraft powered by a Continental O-470-L or O-470-R, landplane gross weight and first certified on 14 June 1960. 180E Four seat high wing light aircraft powered by a Continental O-470-L or O-470-R, landplane gross weight and first certified on 21 September 1961. 180F Four seat high wing light aircraft powered by a Continental O-470-L or O-470-R, landplane gross weight and first certified on 25 June 1962. 180G Six seat high wing light aircraft powered by a Continental O-470-L or O-470-R, landplane gross weight and first certified on 19 July 1963. 180H Six seat high wing light aircraft powered by a Continental O-470-L or O-470-R, landplane gross weight and first certified on 17 June 1964. 180I There was no "I" model Cessna 180. Six seat high wing light aircraft powered by a Continental O-470-R or O-470-S, landplane gross weight and first certified on 13 October 1972. Six seat high wing light aircraft powered by a Continental O-470-U for which AVGAS 100 or 100LL is specified; previous engines were designed for AVGAS 80 (formerly called 80/87), landplane gross weight and first certified on 19 August 1976. Operators Civil The Cessna 180 is popular with air charter companies and is operated by private individuals and companies. Military 19 Cessna 180s were in service with both the Australian Army and RAAF from 1959 to 1974. Royal Australian Air Force No. 16 Air Observation Post Flight RAAF Australian Army Aviation No. 16 Army Light Aircraft Flight 161 (Independent) Reconnaissance Flight – The Australian Army operated a number of Cessna 180s as surveillance aircraft with the 161 Reconnaissance Flight (call sign "Possum") during the Vietnam War. Union of Burma Air Force - 10 Cessna 180s operated in 1982. Public Force of Costa Rica Honduran Air Force Indonesian Air Force Israeli Air Force Khmer Air Force – operated 2 Cessna 180s. Philippine Air Force Specifications (1978 Cessna 180 II landplane) See also References Bibliography External links National Air and Space Museum exhibit of Jerry Mock's Cessna 180, "Spirit of Columbus" FAA N1538C "Spirit of Columbus" Returns to Public Display at