EC-121
| EC-121 Warning Star | |
|---|---|
 |
|
| EC-121T Warning Star | |
| Role | Airborne early warning and control aircraft |
| Manufacturer | Lockheed |
| First flight | 9 June 1949 |
| Introduction | 1954 |
| Retired | 1982 (USN) |
| Primary users |
United States Navy United States Air Force |
| Produced | 1953–1958 |
| Number built | 232 |
| Developed from |
L-749 Constellation L-1049 Super Constellation C-121 Constellation |
The Lockheed EC-121 Warning Star was a United States Navy and United States Air Force Airborne early warning and control radar surveillance aircraft. A military version of the Lockheed L-1049 Super Constellation, it was designed to serve as an airborne early warning system to supplement the Distant Early Warning Line, using two large radomes, a vertical dome above and a horizontal one below the fuselage. EC-121s were also used for intelligence gathering (SIGINT).
It was introduced in 1954 and retired from service in 1978, although a single specially modified EW aircraft remained in service with the U.S. Navy until 1982. The U.S. Navy versions when initially procured were designated WV-1 (PO-1W), WV-2, and WV-3. Warning Stars of the U.S. Air Force served during the Vietnam War as both electronic sensor monitors and as a forerunner to the Boeing E-3 Sentry AWACS. U.S. Air Force aircrews adopted the civil nickname, "Connie" (diminutive of Constellation) as reference, while naval aircrews used the term "Willie Victor" based on a slang version of the NATO phonetic alphabet and the Navy's pre-1962 "WV-" designations for the aircraft type.
Since 1943 the Lockheed Constellation had been in USAAF service as the C-69. The use of the Constellation by the U.S. Navy for patrol and airborne early warning duties was first investigated in 1949, when the Navy acquired two Lockheed L-749 Constellations. First flown on 9 June 1949, the PO-1W carried large, long-range radars in massive radomes above and below the fuselage. As the radomes produced considerable more side area, the vertical stabilizers of the PO-1W had to be enlarged. After the PO-1W, which was redesignated WV-1 in 1952, had proved that it was possible to operate large radars on aircraft, the U.S. Navy ordered the WV-2 based on the L-1049 Super Constellation. The WV-1s were later transferred to the Federal Aviation Agency in 1958–1959.
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