E-3 Sentry (AWACS)

The E-3 Sentry is an airborne warning and control system (AWACS) aircraft that provides all-weather surveillance, command, control and communications needed by commanders of U.S. and NATO air defense forces.

The E-3 Sentry is a modified Boeing 707/320 commercial airframe with a rotating radar dome. The dome is 30 feet (9.1 meters) in diameter, six feet (1.8 meters) thick, and is held 11 feet (3.33 meters) above the fuselage by two struts. It contains a radar subsystem that permits surveillance from the Earth's surface up into the stratosphere, overland or water. The radar has a range of more than 250 miles (375.5 kilometers) for low-flying targets and farther for aerospace vehicles flying at medium to high altitudes. The radar combined
with an identification friend or foe subsystem can look down to detect, identify and track enemy and friendly low-flying aircraft by eliminating ground clutter returns that confuse other radar systems.
Other major subsystems in the E-3 are navigation, communications and computers (data processing). Consoles display computer-processed data in graphic and tabular format on video screens. Console operators perform surveillance, identification, weapons control, battle management and communications functions.
The radar and computer subsystems in the E-3 Sentry can gather and present broad and detailed battlefield information. Data is collected as events occur. This includes position and tracking information on enemy aircraft and ships, and location and status of friendly aircraft, naval vessels.
The information can be sent to major command and control centers in rear areas or aboard ships. In time of crisis, this data can be forwarded to the president and secretary of defense in the United States. It is a jam resistant system that has performed missions while experiencing heavy electronic countermeasures.
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. It can also provide information for commanders of air operations to gain and maintain control of the air battle.
As an air defense system, E-3s can detect, identify and track airborne enemy forces far from the boundaries of the United States or NATO countries. It can
direct fighter-interceptor aircraft to these enemy targets.
Experience has proven that the E-3 Sentry can respond quickly and effectively to a crisis and support worldwide military deployment operations.
With its mobility as an airborne warning and control system, the Sentry has a greater chance of surviving in warfare than a fixed, ground-based radar system. Among other things, the E-3s flight path can quickly be changed according to mission and survival requirements.
The E-3 Sentry can fly a mission profile for more than eight hours without refueling. It's range and on-station time can be increased through inflight refueling and the use of an on-board crew rest area.

Engineering, test and evaluation began on the first E-3 Sentry in October 1975. In March 1977 the 552nd Airborne Warning and Control Wing (now 552nd Air
Control Wing, Tinker Air Force Base, Okla.) received the first E-3s.
Air Combat Command has 28 E-3s at Tinker AFB. Pacific Air Forces has four E-3 Sentries assigned to the 961st Airborne Air Control Squadron (AACS), Kadena AB, Japan, and the 962nd AACS, Elmendorf AFB, Alaska. There is also one test aircraft at the Boeing Aircraft Company.
NATO has acquired 17 E-3As and support equipment. The first E-3 was delivered to NATO in January 1982. The United Kingdom has seven E-3s, France has four, and Saudi Arabia has five. Japan has four AWACS housed on the Boeing 767 airframe.
As proven in operations Desert Storm, Allied Force, Enduring Freedom and Iraqi Freedom, the E-3 Sentry is the premier air battle command and control aircraft in
the world. AWACS aircraft and crews were instrumental to the successful completion of operations Northern and Southern Watch, and are still engaged in operations
Noble Eagle and Enduring Freedom. They provide radar surveillance and control in addition to providing senior leadership with time-critical information on the actions of enemy forces. The date collection capability of the E-3 radar and computer subsystems allowed an entire air war to be recorded for the first time in the history of aerial warfare.
In March 1996, the Air Force activated the 513th Air Control Group, an AWACS Reserve Associate Program unit, which performs duties on active-duty aircraft.
During the spring of 1999, the first AWACS aircraft went through the Radar System Improvement Program (RSIP). RSIP is a joint U.S./NATO development
program which involved a major hardware and software intensive modification to the existing radar system. Installation of RSIP enhanced the operational
capability of the E-3 radar electronic counter-measures, and improved the system's realiability, maintainability and availability.

Primary Function: Airborne surveillance, command, control and communications
Builder: Boeing Aerospace Co.
Power Plant: Four Pratt and Whitney TF33-PW-100A turbofan engines
Thrust: 21,000 pounds (9,450 kilograms) each engine
Length: 145 feet, 6 inches (44 meters)
Wingspan: 130 feet, 10 inches (39.7 meters)
Height: 41 feet, 4 inches (12.5 meters)
Rotodome: 30 feet in diameter (9.1 meters), 6 feet thick (1.8 meters), mounted 11 feet (3.33 meters) above fuselage
Speed: Optimum cruise 360 mph (MACH 0.48)
Ceiling: Above 29,000 feet (8,788 meters)
Maximum Takeoff Weight: 347,000 pounds (156,150 kilograms)
Endurance: More than 8 hours (unrefueled)
Unit Cost: $270 million (fiscal 98 constant dollars)
Crew: Flight crew of four, plus mission crew of 13-19 specialists (mission crew size varies according to mission)
Date Deployed: March 1977
Inventory: Active force, 33 (1 test); Reserve, 0; Guard, 0