Development
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 fins of the PO-1W had to be increased. 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.
The WV-2/EC-121D was initially fitted with a dorsal AN/APS-45 height finder radar and a ventral AN/APS-20 air search radar. These radars were later upgraded to AN/APS-103 and AN/APS-95 radars, although not simultaneously. The crew commonly numbered 18, six officers (two pilots, two navigators, two weapons controllers) and 12 enlisted personnel (two flight engineers, one radio operator, two crew chiefs, five radar operators, two radar technicians). However, when North Korea shot down a Navy EC-121 in 1969, a crew of 31 was on board.
Orders were placed totaling 142 PO-2W Constellations based on the Lockheed L-1049 Super Constellation with deliveries beginning in 1953. The type was redesignated WV-2 in 1954. The WV-2 was familiarly known to its crews as "Willy Victor". In 1962, with standardization of aircraft designations within the Department of Defense, the WV-2 then became the EC-121K. A total of 13 of these were converted to WV-2Q electronic intelligence aircraft (which became EC-121M in 1962), and nine were converted to WV-3 weather reconnaissance aircraft (WC-121N in 1962). The EC-121K was also operated by Training Squadron 86 (VT-86) at NAS Glynco, Georgia for training of Student Naval Flight Officers destined to fly both the EC-121 and the Grumman E-2 Hawkeye. When NAS Glynco was closed and VT-86 transferred to NAS Pensacola, Florida in 1973, the squadron's last EC-121 was also flown to NAS Pensacola for transfer to the collection of the National Museum of Naval Aviation where it remains today. A single aircraft became an NC-121K, an electronic warfare variant assigned to Tactical Electronic Warfare Squadron 33 (VAQ-33) at NAS Key West, Florida. This aircraft was the last EC-121 in operational service, flying until 25 June 1982.
The Air Force received 10 RC-121C and 74 EC-121D Warning Stars also based on the L-1049 beginning with diversions from the Navy contracts in October 1953. The 10 RC-121Cs became trainers, designated TC-121C. Between 1966 and 1969, 30 retired Navy EC-121s were transferred to the USAF and converted in EC-121Rs as sensor-monitoring aircraft. Of the 74 EC-121s, 42 were converted to the EC-121H upgrade beginning in 1962, and in 1969, 15 of the remaining EC-121Ds and seven of the EC-121Hs were further upgraded into the final operational variant, the EC-121T, which served as an AWACS prototype in Southeast Asia in 1972. Five EC-121Ds were modified to be broadcasting aircraft for psychological warfare operations, the predecessors of the EC-130 Commando Solo.
Read more about this topic: Lockheed EC-121 Warning Star
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