page_title: SEPECAT Jaguar
section_title: Background
hierarchical_section_title: SEPECAT Jaguar / Development / Background
caption_attribution_description: A Royal Air Force SEPECAT Jaguar T2 aircraft in flight over Scotland (UK) on 15 June 1981. The aircraft was involved in a tactical bombing competition between British and U.S. aircrews.
context_page_description: The SEPECAT Jaguar is a Anglo-French jet attack aircraft originally used by the British Royal Air Force and the French Air Force in the close air support and nuclear strike role. It is still in service in upgraded form with the Indian Air Force.
  Originally conceived in the 1960s as a jet trainer with a light ground attack capability, the requirement for the aircraft soon changed to include supersonic performance, reconnaissance and tactical nuclear strike roles. A carrier-based variant was also planned for French Navy service, but this was cancelled in favour of the cheaper Dassault Super Étendard. The aircraft were manufactured by SEPECAT, a joint venture between Breguet and the British Aircraft Corporation, one of the first major joint-Anglo-French military aircraft programmes.
  The Jaguar was exported to India, Oman, Ecuador and Nigeria. With various air forces, the Jaguar was used in numerous conflicts and military operations in Mauritania, Chad, Iraq, Bosnia, and Pakistan, as well as providing a ready nuclear delivery platform for the United Kingdom, France, and India throughout the latter half of the Cold War and beyond.
context_section_description: The Jaguar programme began in the early 1960s, in response to a British requirement (Air Staff Target 362) for an advanced supersonic jet trainer to replace the Folland Gnat T1 and Hawker Hunter T7, and a French requirement (ECAT or École de Combat et d'Appui Tactique, "Tactical Combat Support Trainer") for a cheap, subsonic dual role trainer and light attack aircraft to replace the Fouga Magister, Lockheed T-33 and Dassault Mystère IV. In both countries several companies tendered designs: BAC, Hunting, Hawker Siddeley and Folland in Britain; Breguet, Potez, Sud-Aviation, Nord, and Dassault from France. A Memorandum of Understanding was signed in May 1965 for the two countries to develop two aircraft, a trainer based on the ECAT, and the larger AFVG (Anglo-French Variable Geometry).
  Cross-channel negotiations led to the formation of SEPECAT (Société Européenne de Production de l'Avion d'École de Combat et d'Appui Tactique – the "European company for the production of a combat trainer and tactical support aircraft") in 1966 as a joint venture between Breguet and the British Aircraft Corporation to produce the airframe. Though based in part on the Breguet Br.121, using the same basic configuration and an innovative French-designed landing gear, the Jaguar was built incorporating major elements of design from BAC, notably the wing and high lift devices.
  Production of components would be split between Breguet and BAC, and the aircraft themselves would be assembled on two production lines; one in the UK and one in France, To avoid any duplication of work, each aircraft component had only one source. The British light strike/tactical support versions were the most demanding design, requiring supersonic performance, superior avionics, a cutting edge nav/attack system of more accuracy and complexity than the French version, moving map display, laser range-finder and marked-target seeker (LRMTS). As a result, the initial Br.121 design needed a thinner wing, redesigned fuselage, a higher rear cockpit, and after-burning engines. While putting on smiling faces for the public, maintaining the illusion of a shared design, the British design departed from the French sub-sonic Breguet 121 to such a degree that it was effectively a new design.
  A separate partnership was formed between Rolls-Royce and Turbomeca to develop the Adour afterburning turbofan engine. The Br.121 was proposed with Turbomeca's Tourmalet engine for ECAT but Breguet preferred the RR RB.172 and their joint venture would use elements of both. The new engine, which would be used for the AFVG as well, would be built in Derby and Tarnos.
  Previous collaborative efforts between Britain and France had been complicated – the AFVG programme ended in cancellation, and controversy surrounded the development of the supersonic airliner Concorde. Whilst the technical collaboration between BAC and Breguet went well, when Dassault took over Breguet in 1971 it encouraged acceptance of its own designs, such as the Super Étendard naval attack aircraft and the Mirage F1, for which it would receive more profit, over the Anglo-French Jaguar.
  The initial plan was for Britain to buy 150 Jaguar "B" trainers, with its strike requirements being met by the advanced BAC-Dassault AFVG aircraft, with France to buy 75 "E" trainers (école) and 75 "A" single-seat strike attack aircraft (appui). Dassault favoured its own Mirage G aircraft above the collaborative AFVG, and in June 1967, France cancelled the AFVG on cost grounds. This left a gap in the RAF's planned strike capabilities for the 1970s; at the same time as France's cancellation of the AFVG, Germany was expressing a serious interest in the Jaguar, and thus the design became more oriented towards the low-level strike role.
  The RAF had initially planned on a buy of 150 trainers; however, with both the BAC TSR-2 tactical strike aircraft and Hawker Siddeley P.1154 supersonic V/STOL fighter cancelled, the RAF were looking increasingly hard at their future light strike needs and realizing that they now needed more than just advanced trainers with
caption: RAF Jaguar T2 in flight displaying underside, 1,187 litre tanks and CBLS (carrier, bomb, light store) fitted to its under-wing pylons.
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