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Ef-111a

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Ef-111a

EF-111A Raven
The EF-111A Raven electronic warfare variant.
Role Electronic warfare
Manufacturer General Dynamics, conversion by Grumman
First flight 10 March 1977
Introduction 1983
Retired 1998
Status Retired
Primary user United States Air Force
Number built 42
Unit cost
US$15 million, plus $25 million each for conversion[1]
Developed from General Dynamics F-111 Aardvark

The General Dynamics/Grumman EF-111A Raven was an electronic warfare aircraft designed to replace the B-66 Destroyer in the United States Air Force. Its crews and maintainers often called it the "Spark-Vark", a play on the F-111's "Aardvark" nickname.

The USAF contracted with Grumman in 1974 to convert some existing General Dynamics F-111As into electronic warfare/electronic countermeasures (ECM) aircraft.[N 1] The USAF had considered the Navy / Marine Corps Grumman EA-6B Prowler, but was reluctant to adopt a Navy aircraft. The EF-111 entered service in 1983 and served until it was retired in 1998. Afterwards, the Air Force began depending on Navy and Marine Corps EA-6Bs for electronic warfare support.

Design and development

In the late 1960s, the U.S. Air Force sought a replacement for aging EB-66 and EB-57 electronic warfare aircraft. The Air Force studied the use of Navy EA-6B Prowlers during 1967–68.[3] However, the Air Force desired a penetrating electronic jamming aircraft with supersonic speed,[2][3] and, in 1972, decided to modify F-111As into electronic warfare aircraft as a cost effective option.[4]

In January 1974 the Air Force awarded electronic warfare study contracts to Grumman and General Dynamics.[2] Grumman was selected as the EF-111 prime contractor in December 1974, then was awarded a contract to modify two F-111As into EF-111 prototypes in January 1975.[4] The first fully equipped model, known then as the "Electric Fox", flew on 10 March 1977, and deliveries to combat units began in 1981. A total of 42 airframes were converted at a total cost of US$1.5 billion, the last delivered in 1985.[1]


The Raven retained the F-111A's navigation systems, with a revised AN/APQ-160 radar primarily for ground mapping. The primary feature of the Raven, however, was the AN/ALQ-99E jamming system, developed from the Navy's ALQ-99 on the Prowler. The aircraft also utilized the ALR-62 Countermeasures Receiving System (CRS) as a Radar Homing and Warning (RHAW) System, the same system carried by all F-111 fighter/bomber models in the United States and Australia. The ALQ-99E primary electronics were installed in the weapons bay, with transmitters fitted in a 16 feet (4.9 m) long ventral "canoe" radome; the complete installation weighed some 6,000 pounds (2,700 kg). Receivers were installed in a fin-tip pod, or "football", similar to that of the EA-6B. The aircraft's electrical and cooling systems had to be extensively upgraded to support this equipment. The cockpit was also rearranged, with all flight and navigation displays relocated to the pilot's side, and flight controls except throttles being removed from the other seat, where the electronic warfare officer's instrumentation and controls were installed.

The EF-111 was unarmed. Its speed and acceleration were its main means of self-defense. It was not capable of firing anti-radiation missiles in the lethal SEAD role, which was a tactical limitation. The Raven's engines were upgraded to the more powerful TF30-P-9 of the D-model, with 12,000 pounds-force (53 kN) dry and 19,600 lbf (87 kN) afterburning thrust[5] in 1986.[6] From 1987 to 1994 the "Spark 'Vark" underwent an Avionics Modernization Program (AMP), similar to the Pacer Strike program for the F-model. This added a dual AN/ASN-41 ring laser gyroscope INS, AN/APN-218 Doppler radar, and an updated AN/APQ-146 terrain-following radar. Cockpit displays were upgraded with multi-function displays.

Operational history


The EF-111A achieved initial operational capability in 1983.[7] The EF-111A received the official popular name Raven, although in service it acquired the nickname "Spark 'Vark". EF-111s first saw combat use with the 20th Tactical Fighter Wing at RAF Upper Heyford during Operation El Dorado Canyon against Libya in 1986, and Operation Just Cause in Panama during late 1989.[8]

The Raven served in the Gulf War during Operation Desert Storm in 1991. On 17 January 1991, a USAF EF-111 crew of Captain James Denton and Captain Brent Brandon ("Brandini") achieved an unofficial kill against an Iraqi Dassault Mirage F1, which they managed to maneuver into the ground, making it the only member of the F-111/FB-111/EF-111 family to achieve an aerial victory over another aircraft.[1][9]


On 13 February 1991, EF-111A, AF Ser. No. 66-0023, callsign Ratchet 75, crashed[10] into terrain while maneuvering to evade a perceived enemy aircraft threat killing the pilot, Capt Douglas L. Bradt, and the EWO, Capt Paul R. Eichenlaub. It was the only EF-111A lost during combat, the only loss killing its crew, and one of just three EF-111s lost in its history.[11]

Later action

EF-111s were also deployed to Aviano Air Base, Italy in support of Operation Deliberate Force during the mid-1990s. The Raven also flew missions in Operation Provide Comfort, Operation Northern Watch and Operation Southern Watch.[9]

The last deployment of the Raven was a detachment of EF-111s stationed at Al Kharj/Prince Sultan Air Base in Saudi Arabia until April 1998.[6]

Shortly afterward, the USAF began withdrawing the final EF-111As from service, and placed them in storage at the Aerospace Maintenance and Regeneration Center (AMARC) at Davis-Monthan AFB, Arizona. The last EF-111s were retired on 2 May 1998, at Cannon AFB, New Mexico. These were the final USAF F-111s in service.[6] EA-6B Prowlers took over the electronic warfare role for the U.S. Air Force, along with Navy and Marine Corps use.

Variants

EF-111A
Electronic warfare conversion of the F-111A, 42 conversions including two prototypes.

Operators

 United States

United States Air Force[12]

Aircraft on display


Of the 42 converted aircraft, 36 were sent to AMARC or scrapped, 3 were destroyed in crashes and 4 are on display, as one of the AMARC aircraft is now sitting on AMARC's display row:[13]

Specifications (EF-111A)

Specifications are for EF-111A except where noted.

Data from The Great Book of Modern Warplanes[18] General Dynamics F-111 "Aardvark"[19] Modern Fighting Aircraft[20]

General characteristics

Performance

See also

Related development
Aircraft of comparable role, configuration and era

Related lists

References

Notes
Citations
Bibliography
  • Eden, Paul, ed. "General Dynamics F-111 Aardvark/EF-111 Raven". Encyclopedia of Modern Military Aircraft. London: Amber Books, 2004. ISBN 1-904687-84-9.
  • Gunston, Bill. F-111, Modern Fighting Aircraft, Vol. 3. New York: Salamander Books, 1983. ISBN 0-668-05904-4.
  • Logan, Don. General Dynamics F-111 Aardvark. Atglen, Pennsylvania: Schiffer Military History, 1998. ISBN 0-7643-0587-5.
  • Miller, Jay. General Dynamics F-111 "Arardvark". Fallbrook, California: Aero Publishers, 1982. ISBN 0-8168-0606-3.
  • Thornborough, Anthony M. and Peter E. Davies. F-111 Success in Action. London: Arms and Armour Press, 1989. ISBN 0-85368-988-1.

External links

  • "General Dynamics EF-111A Raven Fact Sheet". National Museum of the United States Air Force.
  • EF-111 page on GlobalSecurity.org
  • Future Of Airborne Tactical Jamming report
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