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In page Boeing E-3 Sentry:

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The unpressurized rotodome is 30 ft (9.1 m) in diameter, 6 ft (1.8 m) thick at the center, and is held 11 ft (3.4 m) above the fuselage by 2 struts.[1] 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 shifters. 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 AN/APY-1 and AN/APY-2 passive electronically scanned array radar system[citation needed] to provide surveillance from the Earth's surface up into the stratosphere, over land or water.