270 million (FY1998 constant dollars) Developed from The Boeing E-3 Sentry, commonly known as AWACS, is an American (AEW&C) aircraft developed. Derived from the, it provides all-weather surveillance, command, control, and communications, and is used by the,,,, and. The E-3 is distinguished by the distinctive rotating above the fuselage. Production ended in 1992 after 68 aircraft had been built. In the mid-1960s, the US Air Force (USAF) was seeking an aircraft to replace its piston-engined, which had been in service for over a decade.
After issuing preliminary development contracts to three companies, the USAF picked Boeing to construct two airframes to test Westinghouse Electric and 's competing radars. Both radars used, with Westinghouse's design emerging as the contract winner. Free Movie Download The Wishmaster 4 In Hindi. Testing on the first production E-3 began in October 1975. The first USAF E-3 was delivered in March 1977, and during the next seven years, a total of 34 aircraft were manufactured. NATO, as a single identity, also had 18 aircraft manufactured, basing them in Germany. The E-3 was also sold to the United Kingdom (seven) and France (four) and (five, plus eight E-3-derived tanker aircraft).
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In 1991, when the last aircraft had been delivered, E-3s participated in, playing a crucial role of directing aircraft against the enemy. Throughout the aircraft's service life, numerous upgrades were performed to enhance its capabilities. In 1996, Westinghouse Electric's Defense & Electronic Systems division, was acquired by Northrop Corporation before its being renamed, which currently supports the E-3's radar. Contents • • • • • • • • • • • • • • • • Development [ ] Background [ ] In 1963, the USAF asked for proposals for an Airborne Warning and Control System (AWACS) to replace its, which had served in the role for over a decade. The new aircraft would take advantage of improvements in radar technology and in computer aided radar data analysis and data reduction.
These developments allowed airborne radars to 'look down', detect the movement of low-flying aircraft (see ), and discriminate, even over land, target aircraft's movements—previously this had been impossible, due to the inability to discriminate an aircraft's track from. Contracts were issued to Boeing,, and, the latter being eliminated in July 1966. In 1967, a parallel program was put into place to develop the radar, with and the being asked to compete in producing the radar system. In 1968, it was referred to as Overland Radar Technology (ORT) during development tests on the modified EC-121Q. The Westinghouse radar antenna was going to be used by whichever company won the radar competition, since Westinghouse had pioneered in the design of high-power RF phase-shifters. The piston-engined, a military development of the, saw service since the mid-1950s. Boeing initially proposed a purpose-built aircraft, but tests indicated it would not outperform the already-operational 707, so the latter was chosen instead.
To increase endurance, this design was to be powered by eight. It would carry its radar in a rotating dome mounted at the top of a forward-swept tail, above the fuselage. Boeing was selected ahead of 's -based proposal in July 1970. Initial orders were placed for two aircraft, designated EC-137D as test beds to evaluate the two competing radars.