NEWS

The AWACS is so much more than just a sentry

Since 1977, the E-3 Airborne Early Warning and Control System (AWACS) has provided airborne surveillance, command, and control functions over battle spaces in conflicts around the globe. Operated by four countries and NATO, the E-3 allows radar to detect low-flying aircraft over land, a capability impossible for previous airborne radars due to an inability to discriminate aircraft from ground clutter. This technological advancement provides more accurate information, with which air operations commanders can gain and maintain control of the air battle. In support of air-to-ground operations, the Sentry can provide direct information needed for interdiction, reconnaissance, airlift and close-air support for friendly ground forces.


An E-3 Sentry assigned to the 961st Airborne Air Control Squadron approaches the boom pod of a KC-135 Stratotanker assigned to the 909th Aerial Refueling Squadron to receive fuel during Cope North 2017, Feb. 22, 2017. The exercise includes 22 total flying units and more than 2,700 personnel from three countries and continues the growth of strong, interoperable relationships within the Indo-Asia-Pacific region through integration of airborne and land-based command and control assets. (U.S. Air Force photo by Senior Airman Keith James)

Development

In the 1960s, The U.S. Air Force sought proposals for a jet-powered replacement for its piston-engine EC-121 Warning Stars. The new aircraft would utilize new radar technology and computer-aided data analysis. The radar was developed by Westinghouse Electric, who pioneered the design of High-Power Radio Frequency phase shifters. The 18-bit computer and beyond-the-horizon pulse mode allowed the radar to detect ships at sea when the radar beam is directed below the horizon. Boeing decided to base their design on the existing 707 commercial jet airframe modified to mount the radar in a 30-foot wide, rotating dome on top of the aircraft and allow for in-flight refueling.

Today, the E-3 is undergoing modernization to keep it commanding the battlespace for years to come. A complete flight deck modernization program has been initiated to maintain compliance with worldwide airspace mandates. A Radar System Improvement Program has enhanced the radar's electronic countermeasures and improved the system's reliability and detection of low radar cross-section targets.

Also Read: The Pentagon wants AI on fighters to predict mechanical failures

Operational history

The USAF employs 31 operational E-3 Sentry aircraft. Twenty-seven fly within Air Combat Command and four in Pacific Air Forces. The E-3 has proven its worth allowing commanders a detailed, real-time view of the battlespace during operations Desert Storm, Allied Force, Enduring Freedom, Iraqi Freedom and Odyssey Dawn/Unified Protector.

The E-3 has also deployed to support humanitarian relief operations in the U.S. following Hurricanes Rita and Katrina, coordinating rescue efforts between military and civilian authorities. The E-3 can fly an eight-hour mission without refueling. Its on-station time can be increased through in-flight refueling, with only necessary limitations for crew rest.

Active squadrons

• 607th, 726th, 728th, and 729th Air Control Squadrons, 552nd Air Control Wing, Tinker Air Force Base, Oklahoma

• 962nd Air Control Squadron, 3rd Wing, Elmendorf AFB Alaska

• 961st Air Control Squadron, 18th Wing, Kadena Air Base, Japan

Did you know?

During Desert Storm, E-3 controllers assisted in 38 of the 41 air-to-air kills recorded by coalition aircraft during the conflict.

The Radome is tilted slightly down towards the front to decrease aerodynamic drag

The E-3 Sentry mission crew of 13 to 19 Airmen monitor 14 consoles inside the aircraft and can track aircraft 400 miles away

Aircraft stats for the E-3 Sentry. (Image from the DoD)

Aircraft stats

Primary function: airborne battle management, command, and control

Contractor: Boeing Aerospace Co.

Power plant: four Pratt and Whitney TF33-PW-100A turbofan engines

Thrust: 20,500 pounds each engine at sea level

Rotodome: 30 feet in diameter (9.1 meters), 6 feet thick (1.8 meters), mounted 11 feet (3.33 meters) above fuselage

Wingspan: 145 feet, 9 inches (44.4 meters)

Length: 152 feet, 11 inches (46.6 meters)

Height: 41 feet, 9 inches (13 meters)

Weight: 205,000 pounds (zero fuel) (92,986 kilograms)

Maximum Takeoff Weight: 325,000 pounds (147,418 kilograms)

Fuel Capacity: 21,000 gallons (79,494 liters)

Speed: optimum cruise 360 mph (Mach 0.48)

Range: more than 5,000 nautical miles (9,250 kilometers)

Ceiling: Above 29,000 feet (8,788 meters)

Crew: flight crew of four plus mission crew of 13-19 specialists (mission crew size varies according to mission)

Unit Cost: $270 million (fiscal 98 constant dollars)

Initial operating capability: April 1978

Inventory: active force, 32 (one test); Reserve, 0; Guard, 0

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