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LTV A-7 Corsair II

The LTV A-7 Corsair II is an American carrier-capable subsonic light attack aircraft designed and manufactured by Ling-Temco-Vought (LTV).

Development
Origins In 1960, officials within the United States Navy (USN) began to consider the need to replace its existing fleet of Douglas A-4 Skyhawk, a light attack aircraft. In December 1962, the Sea-Based Air Strike Forces (SBASF) study group started examining detailed performance and cost evaluations on the topic. On 29 May 1963, the request for proposals (RFP) associated with the requirement was issued. Accordingly, Vought, Douglas Aircraft, Grumman and North American Aviation chose to respond. On 2 November 1965, Vought publicly demonstrated the first pair of A-7As to 1,000 guests; test pilot John Conrad demonstrated the aircraft's ability to perform rapid rolls even while laden with a payload of six and twelve bombs. A Navy spokesperson acknowledged the A-7's ability to carry double the bombload of an A-4E, or the same payload over twice its maximum distance. On 14 October 1966, enough aircraft had been delivered to the Navy that the first squadron could be formed. The June 1964 contract had ordered the completion of seven development aircraft and 35 production-standard fighter bombers. The adoption of a British engine caused some political controversy on both sides of the Atlantic. The Vought A-7 seemed to be a relatively quick and inexpensive way to satisfy this need. However, the USAF was initially reluctant to take on yet another Navy-designed aircraft, but Secretary of Defense Robert McNamara was insistent. On 5 November 1965, Secretary of the Air Force Harold Brown and USAF Chief of Staff General John P. McConnell announced that they had decided to order a version of the Corsair II, designated A-7D, for the Tactical Air Command. , Wright-Patterson AFB, Ohio. Two YA-7D prototypes were completed with TF30-P-6 engines, and the first of these flew on 6 April 1968. The first Spey-powered A-7D (67-14854) flew for the first time on 26 September 1968. The seventeenth production aircraft introduced a provision for boom flight refueling in place of the Navy's retractable starboard-side probe/drogue system, with the boom receptacle being on the top of the fuselage behind the cockpit and offset to port. These aircraft had all of the other improvements planned for the A-7E, including the improved avionics and the M61 rotary cannon, and were re-designated A-7C after delivery. On 25 November 1968, the first A-7E conducted its first flight; a total of 535 aircraft of this variant would be manufactured. During the 1970s and 1980s, several specialised models, such as the TA-7C for training and EA-7L for electronic warfare, were developed as well. During 1983, the final delivery of a new-build A-7 took place. ==Design==
Design
The LTV A-7 Corsair II was a carrier-capable subsonic attack fighter. It was a derivative of the Vought F-8 Crusader, an earlier fighter; compared to the Crusader, it had a shorter, broader fuselage, and a longer-span wing but without the Crusader's variable-incidence feature. The A-7's wing was not only larger but had reduced sweepback, as well as six pylons with the carriage of up to of bombs or other equipment. According to Gunston and Gilchrist, there were no common structural features shared between the two aircraft despite their visual similarity and shared heritage. The A-7 was fitted with an AN/APQ-116 radar, later followed by the AN/APQ-126, which was integrated into the ILAAS digital navigation system. The radar also fed an IBM navigation and weapons delivery computer which made possible accurate delivery of bombs from a greater stand-off distance, greatly improving survivability compared with faster aircraft such as the McDonnell Douglas F-4 Phantom II. It was the first U.S. aircraft to have a modern head-up display, (made by Marconi-Elliott), now a standard instrument, which displayed information such as dive angle, airspeed, altitude, drift and aiming reticule. The integrated navigation system also had another innovation—the projected map display system (PMDS) which accurately showed aircraft position on two different map scales. The A-7 had more modern avionics and systems than contemporary aircraft. This included data link capabilities that, among others, provided "hands-off" carrier landing capability when used with its approach power compensator (APC) or auto throttle. Other notable and advanced equipment was a projected map display located just below the radar scope. The map display was slaved to the inertial navigation system and provided a high-resolution map image of the aircraft's position superimposed over TPC/JNC charts. Moreover, when slaved to the all-axis auto pilot, the inertial navigation system could fly the aircraft "hands off" to up to nine individual waypoints. Typical inertial drift was minimal for newly manufactured models and the inertial measurement system accepted flyover, radar, and TACAN updates. ==Operational history==
Operational history
Introduction and early operations Initial operational basing/homeporting for USN A-7 squadrons was at NAS Cecil Field, Florida for Atlantic Fleet units and NAS Lemoore, California for Pacific Fleet units. This was in keeping with the role of these bases in already hosting the A-4 Skyhawk attack squadrons that would eventually transition to the A-7. in a Chance Vought F4U-7 Corsair leads A-7 Corsair IIs of VA-147, over NAS Lemoore, California on 7 July 1967 prior to the A-7's first deployment to Vietnam on USS Ranger. The A-7A "NE-300" is the aircraft of the Air Group Commander (CAG) of Attack Carrier Air Wing 2 (CVW-2). From 1967 to 1971, a total of 27 US Navy squadrons took delivery of four different A-7A/B/C/E models. The Vought plant in Dallas, Texas, employed up to 35,000 workers who turned out one aircraft a day for several years to support the navy's carrier-based needs for Vietnam and SE Asia and commitments to NATO in Europe. In 1974, when became the first aircraft carrier to be homeported in Yokosuka, Japan, two A-7A squadrons assigned to Carrier Air Wing Five (CVW-5) were moved to NAF Atsugi, Japan. In 1976, these squadrons (VA-93 and VA-56) finally transitioned to the much more advanced A-7E model. Six Naval Reserve attack squadrons would also eventually transition to the A-7, operating from NAS Cecil Field, Florida; NAS Atlanta/Dobbins ARB, Georgia; NAS New Orleans, Louisiana; NAS Alameda, California and NAS Point Mugu, California. An additional active duty squadron stood up in the 1980s, Tactical Electronic Warfare Squadron 34 (VAQ-34) at NAS Point Mugu, operating twin-seat TA-7C and EA-7L aircraft with both a pilot and a naval flight officer in an adversary electronic warfare role. Pilots of the early A-7s lauded the aircraft for general ease of flying (with the exceptions of poor stability on crosswind landings and miserable stopping performance on wet runways with an inoperative anti-skid braking system) and excellent forward visibility but noted a lack of engine thrust. This was addressed with A-7B and more thoroughly with A-7D/E. The turbofan engine provided a dramatic increase in fuel efficiency compared with earlier turbojets—the A-7D was said to have specific fuel consumption one sixth that of an F-100 Super Sabre at equivalent thrust. An A-7D carrying twelve bombs at at used only of fuel per hour. Typical fuel consumption at mission retrograde during aircraft carrier recovery was approximately compared to over for the Phantom F-4J/N series. The A-7 Corsair II was tagged with the nickname "SLUF" ("Short Little Ugly Fucker") by pilots. Southeast Asia use on USS Ticonderoga in 1968 The A-7D first entered service in 1970 with the 57th Fighter Weapons Wing at Luke AFB Arizona, and the 354th Tactical Fighter Wing at Myrtle Beach AFB, South Carolina was equipped with four squadrons of A-7Ds by 1972; the 355th TFW at Davis-Monthan AFB was equipped with four squadrons in 1972, and in 1973, the 23d TFW at England AFB, Louisiana was fully equipped with A-7Ds. With the end of US involvement in South Vietnam, the 354th TFW, deployed at Korat, began flying combat sorties in Cambodia to support the Lon Nol government in support of Khmer National Armed Forces against the Khmer Rouge. Rotational deployments began to Korat from the 355th TFW and 23d TFW, with pilots and support personnel beginning six-month deployment cycles. In March 1973, the 354th transferred a squadron of A-7Ds to the 388th TFW, the host wing at Korat RTAFB at the time, which re-established the 3d Tactical Fighter Squadron and created a permanent USAF A-7D presence in Southeast Asia. A-7Ds from both wings stationed at Korat engaged in combat operations in Cambodia until 15 August 1973 when an A-7D of the deployed 353d TFS/354th TFW carried out the last air support mission. In March 1974, the 354th TFW transferred several more aircraft to the 3d TFS prior to its return to Myrtle Beach AFB. The USAF A-7D flew a total of 12,928 combat sorties during the war with only six losses Carrier catapult launches at maximum weight under these performance-robbing conditions were not significantly better and were characterized by the aircraft decelerating by as much as immediately after launch. As a result, A-7A units operated their aircraft below the rated maximum takeoff weight for the A-7E. In a sortie against the Thanh Hóa Bridge on 6 October 1972, four A-7Cs from VA-82 successfully delivered 8,000 lb of high explosives with two aircraft carrying two Walleyes, while two others also carried 2,000 lb in Mk 84 GP bombs. In a simultaneous attack, the center piling on the bridge's west side was hit and broke the span in half. After this, the Thanh Hoa bridge was considered permanently destroyed and removed from the target list. The Spey-powered A-7E entered service in Southeast Asia in May 1970 with VA-146 and VA-147 deployed aboard . The A-7E participated in numerous close-air support missions over both North and South Vietnam, with its state-of-the-art bombing and navigation system being particularly reliable and accurate. Most air wings operating A-4 Skyhawks and early A-7s were re-equipped with A-7Es. The A-7E participated in the mining of Haiphong harbor in 1972, and played a vital role in Operations Linebacker I and Linebacker II that led up to the formal end of US involvement in the Vietnam War on 24 January 1973. On 15 May 1975, A-7E aircraft operating from , in conjunction with A-7D aircraft assigned to the 3d TFS at Korat RTAFB, provided air cover in what is considered the last battle of the Vietnam War, the recovery of SS Mayagüez after it was hijacked by Khmer Rouge gunboats. A total of 98 USN A-7 Corsairs were lost during the war. Post-Vietnam era Air National Guard With the pullout of the USAF from its Thailand bases in late 1975, the A-7Ds stationed at Korat initially went to Clark AB, Philippines. The 3d TFS transitioned from its Corsairs to the F-4E Phantom II and remained at Clark. The A-7Ds were returned to the United States where they were reassigned to several Air National Guard squadrons. With the end of the Vietnam War, the Air Force began to transfer its active duty A-7D aircraft to Air National Guard units beginning in 1974. The Corsairs had been, in a sense, a forced acquisition by the USAF in the late 1960s, and the inter-service rivalry of flying a Navy aircraft had led, beginning about 1970, to the development of its own Close Air Support aircraft. In 1974, selection of the Fairchild Republic A-10 Thunderbolt II was made as the replacement for the A-7D. The first A-10As were received by the 354th TFW in 1977 at Myrtle Beach AFB; the 355th TFW at Davis-Monthan AFB began replacing its A-7Ds in 1978, and the 23d TFW at England AFB in 1979. As the A-10s were received, the A-7Ds were transferred from the USAF to the National Guard Bureau for subsequent re-allocation. By 1981, when the 23d TFW sent its last A-7Ds to Tonopah Test Range Airport, Nevada for clandestine use in the Lockheed F-117 Nighthawk development program, fifteen ANG squadrons were equipped with the A-7D Corsair II. However, Congressional decisions added additional funding to the DOD FY 1975 and FY 1976 budgets for the procurement of additional A-7Ds, primarily to keep the LTV production line in Dallas open and the workers employed in the wake of post-Vietnam DOD procurement reductions. As a result of these unplanned acquisitions, the Air Force assigned these new aircraft (all with 1975 tail numbers) to the Arizona Air National Guard 152nd Tactical Fighter Squadron at Tucson, which operated the Air National Guard transition training school for Corsair II pilots. In December 1989, the South Dakota 175th Tactical Fighter Squadron and Ohio 112th Tactical Fighter Squadron were at Howard AFB on a Coronet Cove deployment when President George H. W. Bush announced Operation Just Cause, the United States Invasion of Panama. The ANG squadrons participated in the invasion, flying 34 combat missions, completing 34 sorties, expended 71.7 flying hours and expended 2,715 rounds of ordnance. This terrorist attack was largely unreported due to the Iran hostage crisis at the time. Grenada and Lebanon Navy A-7E squadrons VA-15 and VA-87, from USS Independence, provided close air support during the Invasion of Grenada, codenamed Operation Urgent Fury, in October 1983. Navy A-7s also provided air support during the U.S. mission in Lebanon in 1983. An A-7 and an A-6 Intruder were shot down by Syrian surface-to-air missiles (SAM) on 4 December 1983. Libya On 24 March 1986, during the Gulf of Sidra dispute with Libya, Libyan air defense operators launched SA-5 missiles at two Fighter Squadron 102 (VF-102) Grumman F-14 Tomcats from USS America that were orbiting in international air space on a Combat Air Patrol (CAP) station. A-7s operating from responded by launching the first AGM-88 HARM missiles ever used in combat. On the next day, A-6s attacked Libyan warships approaching the US fleet, while A-7s again launched HARM missiles against Libyan SAM sites. In April 1986, navy Sixth Fleet A-7Es from VA-72 and VA-46 embarked on board USS America also participated in Operation El Dorado Canyon, the retaliatory attack on Libya, using HARM and Shrike anti-radar missiles to protect the naval strike force from SAMs. A-7Es operated from multiple U.S. Navy aircraft carriers while providing escort for oil tankers in the Persian Gulf during Operation Earnest Will. A-7Es of VA-22 and VA-94 from the carrier, Enterprise, sank the Iranian frigate Sahand operating alongside VA-95 as part of Operation Praying Mantis. Operations Desert Shield and Desert Storm While USAF A-7s stayed home in favor of A-10s, the USN deployed two of its last A-7E squadrons to Operation Desert Shield in August 1990 aboard , the only carrier of six deployed to Desert Storm to operate the A-7. The navy squadrons VA-46 and VA-72 made the last combat sorties of the A-7 in Operation Desert Storm flying from the Red Sea to targets throughout Iraq. The A-7 was used both day and night to attack a wide range of heavily defended deep interdiction targets in Iraq as well as "kill boxes" (geographically defined kill zones) in Kuwait, employing a variety of weapons including precision-guided munitions (PGMs), such as the TV-guided Walleye glide bomb, unguided general-purpose bombs, and High Speed Anti-Radiation missiles (HARM). The A-7 was also used as a tanker in numerous in-flight refueling missions. Use in F-117 development The 4450th Tactical Group stationed at Nellis AFB, Nevada had the distinction of being the last active USAF unit to operate the A-7 Corsair II. The mission of the 4450th TG was the operational development of the F-117, and the unit needed a surrogate aircraft for pilot training and practice. A-7Ds and A-7Ks were obtained from various active duty and air national guard squadrons and were assigned initially to the "(P)" or "Provisional" unit of the 4450th Tactical Group, redesignated the 4451st Tactical Squadron in January 1983. The A-7s were used as a deception and training aircraft by the group between 1981 and 1989. It was selected because it demanded a similar pilot workload expected in the F-117A, was single seat, and many of the F-117A pilots had F-4 or F-111 backgrounds. A-7s were used for pilot training before any F-117As had been delivered, to bring all pilots to a common flight training base line. Later, the A-7s were used as chase planes on F-117A tests and other weapon tests at the Nellis Range. For dissimilar air combat training, and aerial demonstrations by the Blue Angels, the Navy would choose the more nimble A-4 Skyhawk as a subsonic maneuvering platform, as some considered the A-7 to be inadequate in air combat, even though it was highly maneuverable. While some questioned its air combat capability it was widely regarded as a highly successful attack aircraft, partly by virtue of being a stable bombing platform. Despite this, the Marine Corps also rejected the Corsair, opting instead for the V/STOL (Vertical/Short Take Off or Landing) AV-8 Harrier as its light attack aircraft to replace its A-4F/M Skyhawks. Greece's Hellenic Air Force ordered sixty new A-7H aircraft and five TA-7Hs in 1974. The delivery of the airplanes started in 1975 and equipped the 347, 340, and 345 Squadrons. In 1993 the Hellenic Air Force received an additional sixty-two A-7Es and nineteen TA-7C surplus USN airplanes given to the 335 and 336 Squadrons. The last A-7Es were retired in October 2014 from the 336th Bomber Squadron. In 1976, Pakistan started talks for 110 A-7Es to strengthen its border with India, but the Carter administration rejected the deal fearing it would intensify an arms race in South Asia with India having recently concluded a $1.6 billion arms deal with the Soviet Union. In 1978, the US instead offered Pakistan 40 F-5E Tiger II with equipment for US$400 million, but Pakistan did not find the deal acceptable and bought the Chinese F-7MP/PG and A-5C instead. General Dynamics F-16 Fighting Falcons began replacing the Air National Guard Corsairs beginning in the late 1980s and the last were retired in 1993 by the units at Rickenbacker Air National Guard Base, Ohio; Des Moines Air National Guard Base, Iowa; Tulsa Air National Guard Base, Oklahoma; and Springfield Air National Guard Base, Ohio. US Navy A-7 Corsairs began being phased out of the fleet during the mid-1980s with the arrival of the McDonnell Douglas F/A-18 Hornet. A-7 squadrons of the United States Navy Reserve transitioned concurrent with (but prior to the completion of) all Regular Navy squadrons. The last Navy A-7s were retired by the last fleet operational squadrons (VA-46 and VA-72) in May 1991 shortly after their return from Operation Desert Storm. By the end of 1998, with the exception of some airframes used as static displays, all US A-7s were disposed of by the AMARC. Some of these surplus aircraft were passed to Greece, Thailand and Portugal. Portuguese Air Force A-7Ps entered service in 1981 and started being phased-out in 1994 with the arrival of the first batch of F-16A Block 15. The last unit was retired in 1999 after 18 years of service. The Corsair II served for 49 years. ==Variants==
Variants
, the "Blue Dolphins", at NAS Jacksonville Florida in 1976 in 1988 LTV TA-7C Corsair II departs the Royal International Air Tattoo, UK, 2014 ;A-7A :First production version. Early US Navy Corsair IIs had two 20 mm Colt Mk 12 cannons with 250 rounds per gun. Maximum ordnance, carried primarily on the wing pylons, was theoretically , but was limited by maximum takeoff weight, so the full weapon load could only be carried with greatly reduced internal fuel. This model was equipped with the AN/APN-153 navigational radar, an AN/APQ-115 terrain following radar, and a separate AN/APQ-99 attack radar. 199 built. ;A-7B :Uprated TF30-P-8 engine with of thrust. In 1971, all surviving A-7Bs were further upgraded with the TF30-P-408 engine with of thrust. The AN/APQ-115 terrain following radar was replaced with an AN/APQ-116 terrain following radar. 196 built. ;A-7C :First 67 production A-7Es with TF30-P-8 engines. ;TA-7C :Two-seat trainer version for US Navy. 24 were converted from A-7Bs, 36 from A-7Cs. In 1984, 49 airframes, including the 8 EA-7Ls, were re-engined with the TF41-A-402 and upgraded to A-7E standard. ;A-7D :Version built for the US Air Force with a more powerful Allison TF41-A-1 turbofan engine producing 14,250 lb (63.4 kN) of thrust, and a single M61 Vulcan 20 mm rotary cannon. An improved AN/APN-185 navigational radar and an upgraded AN/APQ-126 terrain following radar were fitted. 459 built. ;A-7E : Effectively an A-7D modified for naval operations, with the same Allison TF41-A-1 and M61 Vulcan 20 mm rotary cannon. Further improvements were an AN/APN-190 navigational radar and AN/APQ-128 terrain following radar in addition to arrestor gear and folding wings to allow for carrier operations. 529 built. ;YA-7F Strikefighter (A-7D Plus) :Stretched supersonic version of A-7 powered by an F100. It was optimized for the interdiction role, but cancelled after two prototypes were built. ;A-7G :Proposed version for Switzerland, none built. ;YA-7E/YA-7H :Two-seat prototypes built by Ling-Temco-Vought as a private venture. ;A-7H :Modified A-7E for Greece without air-refueling capability. 60 built. ;TA-7H :Two-seat trainer version for Greece. ;A-7K :Two-seat trainer version for Air National Guard. 30 built. ;EA-7L :8 TA-7Cs modified into electronic aggressor aircraft and used by VAQ-34. These were upgraded to A-7E mechanical standards in 1984. ;A-7P :US Navy A-7As rebuilt for the Portuguese Air Force. 44 refurbished with TF30-P-408 engines and an avionics fit similar to the A-7E. ;TA-7P :Two-seat trainer version for the Portuguese Air Force. 6 were converted from secondhand US Navy A-7As. ;B.HT.1 :() Royal Thai Armed Forces designation for the A-7E. ==Operators==
Operators
• – Retired in 2014 • – Retired in 1999 • – Non-operational status since 2007 • – Retired in 1991 ==Aircraft on display==
Aircraft on display
in Halls, Tennessee ==Specifications (A-7E)==
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