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EA-6B Prowler



Northrop Grumman EA-6B Prowler


~ Aircraft History ~


The EA-6B Prowler is the primary tactical jamming aircraft of the US Navy, Air Force and Marine Corps. After becoming operational in 1971, it soon entered combat in 1972 during the Vietnam War. Since then it has demonstrated its proven battlefield performance in joint strikes on Libyan terrorist-related targets in 1986, Operation DESERT STORM, Bosnia-Herzegovina, Kosovo, and Operation IRAQI FREEDOM.

Manufactured by Northrop Grumman Aerospace Corporation, the EA-6B Prowler first became operational in 1971 with numerous upgrades in the years that followed. Its mission filled the need for a dedicated Electronic Warfare aircraft to provide an electronic countermeasure curtain for strike aircraft that was survivable in a tactical environment. The aircraft operates from aircraft carriers and from forward land bases.

The EA-6B Prowler is a twin-engine, mid-wing aircraft. A derivative of the A-6 Intruder, the Prowler has a larger pod at the top of the tail fin to house the electronic warfare equipment and a longer nose with a larger cockpit section with two canopies to accommodate the pilot and mission crew. The under fuselage structure was reinforced in the area of the A-frame arrester hook and landing gear for the heavier aircraft to withstand carrier landings.

The aircraft is crewed by a pilot and three Electronic Countermeasures officers (ECMOs). The forward section of the cockpit accommodates the pilot on the port side and one ECM officer station equipped with the communications, navigation systems, and the defensive electronic countermeasures including the decoy dispensers. The rear cockpit accommodates two ECM officers and the ALQ-99 control and display stations. Either of the two officers can monitor or control the ALQ-99 electronic warfare operations. The side-by-side cockpit arrangement gives maximum efficiency, visibility and comfort.

Designed for carrier and advanced base operations, the Prowler is a fully integrated electronic warfare system combining long-range, all-weather capabilities with advanced electronic countermeasures. A forward equipment bay and pod-shaped faring on the vertical stabilizer fin contain the additional avionics equipment. Five external store stations carry jamming pods, HARMs, or fuel tanks. Prior to flight, external stores are configured to meet unique mission requirements.

The Prowler is armed with the AGM-88 High Speed Anti-Radiation Missile (HARM), developed by Raytheon (formerly Texas Instruments) in Dallas, Texas. The HARM missile seeks and destroys hostile land based and sea borne radar directed air defense artillery systems and surface-to-air missile systems.

Surveillance receivers in the vertical stabilizer pod monitor the threat spectrum of interest. The intercepted information is processed by a Central Mission Computer to determine signal characteristics and to identify the signal sources. This data is displayed to the ECMOs for constant situation awareness and Tactical Jamming System threat management activities. As threats are identified or anticipated, the ECMOs have the option of automatically or manually jamming specific radars and communications or employing HARMs.

The ALQ-99 jamming transmitters are installed in integrally powered pods and carried on external store stations. These are extremely comprehensive tactical jammers, operating over a wide range of overlapping frequency bands including Band 1 (VHF) to Band 10 (12 to 18 GHz). The Prowler carries up to five ALQ-99 tactical jamming pods, two under each wing and one under the fuselage. The pods can be configured to suit the mission requirements. Each pod houses two powerful continuous wave transmitters, which use beam steering to direct the jamming signal at the threat. An exciter in the pod tailors the parameters of the jamming signal. The electrical power source in the pod is a ram air turbine. Each pod has a control computer linked to the ALQ-99 central processing unit on the aircraft.

The central processing unit processes the received threat signals, manages the jamming operations and generates the data for display to the crew. Prior to the mission, data on the characteristics of emitters, which will possibly be deployed by the hostile forces, are downloaded into the threat library in the central processing unit. The CPU compares the parameters of detected threat signals with the threat library using signal-matching algorithms. Threats are identified, located, prioritized and the CPU recommends the action to be taken to counter the threat, or can automatically steer the transmissions to the target location and initiate the jamming sequence.

The receivers are configured to provide the Prowler with 360-degree coverage. Blister fairings on both sides of the tail fin house the receiver antennae for bands 1 and 2 (VHF and VHF/UHF). The fin top blister fairing houses higher frequency receiving antennae systems.

The EA-6B Prowler's primary mission is to protect US or allied carrier groups and aircraft by conducting electronic warfare (jamming enemy radars, communications, and data links). Other mission profiles include carrying out electronic surveillance tasks, armed reconnaissance, and providing defense against incoming anti-ship missiles. The Prowler has the ability to passively detect enemy radar without making its own presence known.

The EA-6B Prowler was the first aircraft built from the drawing boards to fulfill the role of an electronic warfare aircraft. It was designed to complement the Navy's defenses in today's electronic warfare environment. Combining a fully integrated electronic warfare system with long range, all-weather capability, the EA-6B has the ability to intercept, analyze and effectively neutralize hostile radars. Electronic countermeasures required improvement to compete with the ever-increasing complexity of hostile radar-guided guns, missiles and aircraft.

The EA-6B supports strike aircraft, ships, and ground troops by degrading the enemy's early warning capability and electronic weapons systems. The avionics contained in the aircraft enable it to navigate under all weather conditions without reference to ground navigation aids, fly high altitude or low-level profiles, and intercept and jam enemy electronic emissions.

The EA-6B Prowler is included in every aircraft carrier deployment as an integral part of the fleet's first line of defense, and will remain so well into the next century. As a result of US defense restructuring in 1995, the EF-111 Raven was retired and the EA-6B was left as the only radar jammer in the US inventory. Five new squadrons were formed, with four of these squadrons dedicated to supporting USAF Expeditionary Force wings.

There are currently nineteen Prowler squadrons in the US military: four in the Marines and fifteen in the Navy. There are four "Expeditionary" squadrons manned by both Navy and Air Force personnel, which deploy to overseas bases as a replacement for the EF-111 Raven. The Marine squadrons are stationed at Cherry Point, NC. The Navy has fourteen squadrons based at NAS Whidbey Island, WA, and one permanently deployed in Atsugi, Japan.

Since being introduced into the fleet, updates have kept the Prowler abreast of the dynamic threats and the expanding roles associated with the Command and Control Warfare mission area. The EA-6B has made significant contributions to every major conflict in which Allied air has participated since the Vietnam War. It was key to our early and overwhelming success in the Desert Storm War and is now playing an integral role in worldwide peacekeeping operations.

In the coming years, the Prowler fleet will be modernized and upgraded to keep the aircraft and its systems abreast of evolving threats and to maintain aircraft safety. Upgrade programs will address structural and supportability problems associated with aging aircraft and will include numerous avionics improvements for safety of flight and joint interoperability. Later improvements to the Prowler's AN/ALQ-99 tactical jamming system, new high and low frequency transmitters, and continuing structural enhancements, will ensure that the EA-6B remains the world's premier tactical electronic warfare platform and a force multiplier for years to come.

It is said among aviators that no one wants to fly over hostile territory without a Prowler along to provide the Electronic Shield.

 

 

EA-6B Prowler

 

 

 

~ Specifications ~

 

Function

Airborne Command & Control including electronic attack, protection & support.

Weight - Empty

33,600 pounds

Manufacturer

Northrop Grumman Aerospace Corp.

Weight - Maximum

61,500 pounds

Power plant

Two Pratt & Whitney J52-P408A turbofan engines

Internal Fuel

15,422 pounds

Thrust

11,200 pounds per engine

External Fuel

10,000 pounds (typical 4,000 pounds)

Length

59 feet 10 inches

Minimum take-off distance

2,750 feet

Height

16 feet 8 inches

Minimum landing distance

2,185 feet

Wing Span

53 feet

Armament

ALQ-99 Tactical Jamming System and AGM-88 HARM

Maximum Speed

Over 500 knots (575 mph)

Crew

Four (one pilot and three electronic countermeasures officers)

Unrefueled Range (combat configuration)

977.5 miles

First flight

May 25, 1968

Refueled Range

Unlimited (crew fatigue factor - approx. 8 hours)

Operational

July, 1971

Ceiling

37,600 feet

Unit Replacement Cost

$ 52 million

 

 

 

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EA-6B Prowler Triple View

 Three views

EA-6B Prowler Side View

 Side Views

 

EA-6B Prowler Front View

Front View

EA-6B Prowler Top View

Top View

EA-6B Prowler Top View

Top View

EA-6B Prowler Bottom View

Bottom View

Pratt & Whitney J52-P-408A Engine

J52-P408A Engine

 

Pratt & Whitney J52-P-408A Engine

J52-P408A Engine

EA-6B Prowler Cockpits

Instrument

Panel Layout

Engine Danger Zone Chart

Engine Danger Zone

Chart ~ Courtesy of

Eddie Miller

 

 

 

 

Jamming

Naval Aviation News article, July-August 1988

Courtesy of Eddie Miller

Jamming Article

Jamming Article

Jamming Article

Jamming Article

 

 

 

REFERENCES:
Aerofax Minigraph #7 - Grumman EA-6A Intruder & EA-6B Prowler; by Dennis R. Jenkins
EA-6B Prowler in Detail and Scale; by Bert Kinzey

Northrop Grumman Corporation

U.S. Navy

 

Prowler ICAP III

 

 

Pratt & Whitney Dependable Engines

 

 

 

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