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Boeing E-3 Sentry
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===Avionics=== The unpressurized rotodome is {{cvt|30|feet|m}} in diameter, {{cvt|6|feet|m}} thick at the center, and is held {{cvt|11|feet|m}} above the fuselage by 2 struts.<ref name=USAF1/> It is tilted down at the front to reduce its aerodynamic drag, which lessens its detrimental effect on take-offs and endurance. This tilt is corrected electronically by both the radar and [[secondary surveillance radar]] antenna [[phase shifter]]s. The rotodome uses [[bleed air]], outside cooling doors, and [[fluorocarbon]]-based cold plate cooling to maintain the electronic and mechanical equipment temperatures. The hydraulically rotated antenna system permits the {{interlanguage link|AN/APY-1|uk|AN/APY-1}} and [[AN/APY-2]] [[passive electronically scanned array]] radar system{{citation needed|date=October 2023}} to provide surveillance from the Earth's surface up into the [[stratosphere]], over land or water. [[File:ProvideComfortAWACScrew.jpg|thumb|right|Air controllers aboard a US E-3 during [[Operation Provide Comfort]]]] Other major subsystems in the E-3 Sentry are navigation, communications, and computers. 14 consoles display computer-processed data in graphic and tabular format on screens. Its operators perform surveillance, identification, weapons control, battle management and communications functions.<ref name=USAF1/> Data may be forwarded in real-time to any major [[command and control]] center in rear areas or aboard ships. In times of crisis, data may also be forwarded to the [[National Command Authority (United States)|National Command Authority]] in the U.S. via RC-135 or [[aircraft carrier]] task forces.<ref name=USAF1/> [[Electrical generator]]s mounted in each of the E-3's four engines provide 1 [[megawatt]] of electrical power required by the aircraft's radars and electronics.{{citation needed|date=December 2020}} Its pulse-Doppler radar has a range of more than 250 mi (400 km) for low-flying targets at its operating altitude, and the pulse (BTH) radar has a range of approximately 400 mi (650 km) for aircraft flying at medium to high altitudes. The radar, combined with a [[secondary surveillance radar]] (SSR) and [[Electronic warfare support measures|electronic support measures]] (ESM), provides a [[Look-down/shoot-down|look down]] capability, to detect, identify, and track low-flying aircraft, while eliminating ground clutter returns.<ref name=USAF1/><ref name="Boeing1">{{cite web |url=http://www.boeing.com/defense-space/ic/awacs/index.html |title=Airborne Warning and Control System (AWACS) |access-date=26 May 2007 |publisher=Boeing |url-status=dead |archive-url=https://web.archive.org/web/20070518151530/http://www.boeing.com/defense-space/ic/awacs/index.html |archive-date=18 May 2007}}</ref><ref name="FAS1">{{cite web |url=http://www.fas.org/programs/ssp/man/uswpns/air/special/e3.html |title=E-3 Sentry (AWACS) |access-date=13 July 2011 |date=23 April 2000 |work=[[Federation of American Scientists]] |archive-url=https://web.archive.org/web/20110619202254/http://www.fas.org/programs/ssp/man/uswpns/air/special/e3.html |archive-date=19 June 2011 |url-status=live}}</ref>
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