Grumman EA-6A Intruder
The A-6 Intruder was designed to serve two roles: one, to replace the aging A-1 Skyraider and supplement the A-4 Skyhawk in the carrier-based strike role, and two, to give the US Navy a genuine all-weather strike aircraft. The requirement was issued in 1957, and Grumman’s A2F-1 design selected, with the first flight in 1960. In 1962, just before fleet entry in 1963, the Intruder was redesignated A-6A.
The A-6 was designed to hit targets with pinpoint accuracy in adverse weather, day or night, similar to what the USAF would later require for the F-111 Aardvark. For this reason, it was built around the Digital Integrated Attack/Navigation Equipment (DIANE), which used three radar systems to constantly update the INS and provide attack data to the bombardier/navigator sitting in the right seat. The system proved very complicated and it would be some years before it was perfected. Since the weather and night would be the Intruder’s primary defense, no internal armament equipped the aircraft, though it could carry an impressive 18,000 pound warload.
The Intruder was committed early to the Vietnam War, which showed up the flaws in the DIANE system and a more lethal one in the bomb delivery system, which had a tendency to set off the bombs prematurely, destroying the aircraft. Gradually improvements were made, and despite the loss of 84 Intruders over Vietnam, it proved to be extremely effective: until the bugs were ironed out of the F-111A in 1971, the A-6 remained the only American aircraft that could attack during the monsoon season.
Specialized A-6Bs were also produced specifically for Iron Hand defense suppression missions, and A-6Cs for anti-truck operations on the Ho Chi Minh Trail. All three variants were replaced by the A-6E beginning in 1971: this replaced DIANE with a more advanced solid-state computer and the three radars with a single AN/APQ-148 multimode radar.
A-6s would find themselves once more heavily employed during the First Gulf War, flying 4700 sorties for the loss of four aircraft; its final roles would find it supporting Marines in Somalia in 1991 and UN forces in Bosnia in 1995. By that time, surviving A-6Es had been partially upgraded to allow them to fire all newer guided weapons in the inventory (namely the AGM-84 Harpoon, AGM-65 Maverick, and AGM-88 HARM), while most of the fleet also received composite wings.
Grumman further proposed an updated version designated A-6F, with new avionics and engines, but the US Navy rejected this in favor of replacing the Intruder with first the cancelled stealthy A-12A Avenger II, then the F/A-18C/D Hornet. The last A-6E left US Navy service by Feburary 1997; the US Marine Corps had retired theirs in 1993. Older, non-modified aircraft were sunk as an artificial reef off Florida; others remain at AMARC for scrapping.
As the Navy's carrier-based electronic warfare aircraft began to age, namely the EA-1F Skyraider and the EKA-3B Skywarrior, a replacement needed to be found. Initially, the ALQ-99 electronics suite was installed in a standard A-6 Intruder airframe as the EA-6A, but the aircraft was somewhat limited and workload was heavier for a two-man crew, especially in combat. EA-6As did see combat in Vietnam with the US Marine Corps, but something better was clearly needed. The result was the lengthened EA-6B Prowler, which upgraded the electronics suite considerably and also added two more crewmembers to reduce workload and increase effectiveness. The EA-6B first flew in May 1968, and entered US Navy and Marine service in 1971. This relegated the EA-6As to mostly Reserve units until it was retired in 1993. Only 28 A models were built, and at least four are known to survive in museums.
Bureau Number 156984 was a purpose-built EA-6A rather than a conversion, and joined the Navy in 1969. Details about its service are sparse, other than it served for a time in the 1970s with VAQ-209 ("Star Warriors") at NAS Whidbey Island, Washington, was the first EA-6A to be upgraded to near EA-6B standard in the mid-1980s, and retired with VAQ-33 ("Firebirds") at NAS Key West, Florida in 1992. Apparently there was some consideration of expending it as a range target, but instead it was saved for preservation, and by 2002 it had been donated to the Mid-America Museum of Aviation and Transportation at Sioux City, Iowa.
156984 could use some restoration, as the markings have faded and rust has broken out on the airframe. It is positioned at the entrance of the Mid-America Museum. When my friend and I visited in June 2020, the museum was closed due to coronavirus, but we were able to photograph through the fence. My friend's picture is better than mine, so he allowed me to use his...
Grumman EA-6A Intruder
The A-6 Intruder was designed to serve two roles: one, to replace the aging A-1 Skyraider and supplement the A-4 Skyhawk in the carrier-based strike role, and two, to give the US Navy a genuine all-weather strike aircraft. The requirement was issued in 1957, and Grumman’s A2F-1 design selected, with the first flight in 1960. In 1962, just before fleet entry in 1963, the Intruder was redesignated A-6A.
The A-6 was designed to hit targets with pinpoint accuracy in adverse weather, day or night, similar to what the USAF would later require for the F-111 Aardvark. For this reason, it was built around the Digital Integrated Attack/Navigation Equipment (DIANE), which used three radar systems to constantly update the INS and provide attack data to the bombardier/navigator sitting in the right seat. The system proved very complicated and it would be some years before it was perfected. Since the weather and night would be the Intruder’s primary defense, no internal armament equipped the aircraft, though it could carry an impressive 18,000 pound warload.
The Intruder was committed early to the Vietnam War, which showed up the flaws in the DIANE system and a more lethal one in the bomb delivery system, which had a tendency to set off the bombs prematurely, destroying the aircraft. Gradually improvements were made, and despite the loss of 84 Intruders over Vietnam, it proved to be extremely effective: until the bugs were ironed out of the F-111A in 1971, the A-6 remained the only American aircraft that could attack during the monsoon season.
Specialized A-6Bs were also produced specifically for Iron Hand defense suppression missions, and A-6Cs for anti-truck operations on the Ho Chi Minh Trail. All three variants were replaced by the A-6E beginning in 1971: this replaced DIANE with a more advanced solid-state computer and the three radars with a single AN/APQ-148 multimode radar.
A-6s would find themselves once more heavily employed during the First Gulf War, flying 4700 sorties for the loss of four aircraft; its final roles would find it supporting Marines in Somalia in 1991 and UN forces in Bosnia in 1995. By that time, surviving A-6Es had been partially upgraded to allow them to fire all newer guided weapons in the inventory (namely the AGM-84 Harpoon, AGM-65 Maverick, and AGM-88 HARM), while most of the fleet also received composite wings.
Grumman further proposed an updated version designated A-6F, with new avionics and engines, but the US Navy rejected this in favor of replacing the Intruder with first the cancelled stealthy A-12A Avenger II, then the F/A-18C/D Hornet. The last A-6E left US Navy service by Feburary 1997; the US Marine Corps had retired theirs in 1993. Older, non-modified aircraft were sunk as an artificial reef off Florida; others remain at AMARC for scrapping.
As the Navy's carrier-based electronic warfare aircraft began to age, namely the EA-1F Skyraider and the EKA-3B Skywarrior, a replacement needed to be found. Initially, the ALQ-99 electronics suite was installed in a standard A-6 Intruder airframe as the EA-6A, but the aircraft was somewhat limited and workload was heavier for a two-man crew, especially in combat. EA-6As did see combat in Vietnam with the US Marine Corps, but something better was clearly needed. The result was the lengthened EA-6B Prowler, which upgraded the electronics suite considerably and also added two more crewmembers to reduce workload and increase effectiveness. The EA-6B first flew in May 1968, and entered US Navy and Marine service in 1971. This relegated the EA-6As to mostly Reserve units until it was retired in 1993. Only 28 A models were built, and at least four are known to survive in museums.
Bureau Number 156984 was a purpose-built EA-6A rather than a conversion, and joined the Navy in 1969. Details about its service are sparse, other than it served for a time in the 1970s with VAQ-209 ("Star Warriors") at NAS Whidbey Island, Washington, was the first EA-6A to be upgraded to near EA-6B standard in the mid-1980s, and retired with VAQ-33 ("Firebirds") at NAS Key West, Florida in 1992. Apparently there was some consideration of expending it as a range target, but instead it was saved for preservation, and by 2002 it had been donated to the Mid-America Museum of Aviation and Transportation at Sioux City, Iowa.
156984 could use some restoration, as the markings have faded and rust has broken out on the airframe. It is positioned at the entrance of the Mid-America Museum. When my friend and I visited in June 2020, the museum was closed due to coronavirus, but we were able to photograph through the fence. My friend's picture is better than mine, so he allowed me to use his...