Cessna O-1
| L-19/O-1 Bird Dog | |
|---|---|
 |
|
| An O-1E Bird Dog | |
| Role | Observation aircraft |
| National origin | United States |
| Manufacturer | Cessna |
| First flight | 14 December 1949 |
| Introduction | 1950 |
| Retired | 1974 (US) |
| Primary users |
United States Army United States Air Force United States Marine Corps Royal Thai Air Force |
| Number built | 3,431 |
| Developed from | Cessna 170 |
| Variants | Cessna 308 |
The Cessna L-19/O-1 Bird Dog was a liaison and observation aircraft. It was the first all-metal fixed-wing aircraft ordered for and by the United States Army since the U.S. Army Air Forces separated from the Army in 1947, becoming its own branch of service, the United States Air Force. The Bird Dog had a lengthy career in the U.S. military, as well as in other countries.
The U.S. Army was searching for an aircraft that could adjust artillery fire, as well as perform liaison duties, and preferably be constructed of all metal, as the fabric-covered liaison aircraft used during World War II (primarily Stinson and Piper products) had short service lives. The U.S. Army issued the specification for a two-seat liaison and observation monoplane, and the Cessna Aircraft Company submitted the Cessna Model 305A, a development of the Cessna 170. The Cessna 305A was a single-engined, lightweight, strut-braced, high-wing monoplane with a tailwheel landing gear. The greatest difference from the Cessna 170 was that the 305A had only two seats, in tandem configuration (the largest tandem-seat aircraft Cessna ever produced), with angled side windows to improve ground observation. Other differences included a redesigned rear fuselage, providing a view directly to the rear (a feature later dubbed "Omni-View", carried over to Cessna single-engined aircraft after 1964), and transparent panels in the wings' center-section over the cockpit (similar to those found on the Cessna 140 and the later Cessna 150 Aerobat model), which allowed the pilot to look directly overhead. A wider door was fitted to allow a stretcher to be loaded.
The U.S. Army awarded a contract to Cessna for 418 of the aircraft, which was designated the L-19A Bird Dog. The prototype Cessna 305 (registration N41694) first flew on 14 December 1949. Deliveries began in December 1950, and the aircraft were soon in use fighting their first war in Korea from 1950 through 1953. An instrument trainer variant was developed in 1953, later versions had constant speed propellers, and the final version, the L-19E, had a larger gross weight. Cessna produced 3,431 aircraft; it was also built under license by Fuji in Japan.
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