The UK considers replacing the seven Boeing D Sentry AEWMk 1 airborne warning and control (AWACS) aircraft currently in service The E7 aircraft, based on the Boeing 737 platform, is the forerunner for this replacement Although the 15 Strategic Defence and Security Review (SDSR) called for Sentry to remain in service until 35, London In the Sentinel R1 A&EWC aircraft were retired after 14 years in service, and it was recently announced the D Sentry will be retired from service in 22 This comes nearly 12 months before their replacement, the E7A Wedgetail, enters service To meet the needs of the RAF, NATO have agreed to provide their aircraft as coverage The Sentry is a modified Boeing 707/3 commercial airframe with a rotating radar dome The dome is 30 feet (91 meters) in diameter, six feet (18 meters) thick, and is held 11 feet (333 meters) above the fuselage by two struts It contains a radar subsystem that permits surveillance from the Earth's surface up into the stratosphere, over
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