AMX International AMX 3D model

The AMX International AMX is a ground-attack aircraft jointly developed by Brazil and Italy. The AMX is designated A-11 Ghibli by the Italian Air Force and A-1 by the Brazilian Air Force. The Italian name, Ghibli, is taken from the hot dry wind of the Libyan desert.

During the early 1970s, Italian manufacturer Aermacchi conducted a design study on a prospective light ground attack aircraft, which was given the designation of MB-340. During early 1977, the Italian Air Force issued a requirement for 187 new-build strike fighters, which were to replace its existing Aeritalia G.91 in the close air support. During 1980, the Brazilian government announced that they intended to participate in the program in order to provide a replacement for the Aermacchi MB-326. As a result of a memorandum between Italy and Brazil for the type's joint development in 1981, AMX International, an Italian-Brazilian joint venture, was formed to develop, manufacture, and market the aircraft. During early 1977, the Italian Air Force issued a requirement for 187 new-build strike fighters, which were to replace its existing Aeritalia G.91 in the close air support and reconnaissance missions, as well as the Lockheed RF-104G Starfighter also being used in the reconnaissance role.[1][2] Rather than competing for the contract, Aeritalia (now Alenia Aeronautica) and Aermacchi agreed to produce a joint proposal for the requirement, as both firms had been considering the development of a similar class of aircraft for some years. During the early 1970s, Aermacchi had been conducted work on a design study for such a light ground attack aircraft under the designation of MB-340. In April 1978, development work on the joint venture formally commenced.[3]

During 1980, the Brazilian government announced that they intended to participate in the program in order to provide a replacement for the Aermacchi MB-326. In July 1981, the Italian and Brazilian governments agreed on joint requirements for the aircraft, and Embraer was invited to join the industrial partnership.[3] An agreement was also struck to divide AMX manufacturing between the partners; for each production aircraft, Aeritalia manufactured 46.5 per cent of the components (central fuselage, stabilisers and rudders), Aermacchi produced 22.8 per cent (front fuselage and tail cone), and Embraer performed 29.7 per cent of the work (wing, air intakes, pylons and drop tanks).[1] There was no duplication of work, each component of the aircraft was built at one source only. The planned requirements were 187 aircraft for Italy and 100 for Brazil.[2]

Brazilian Air Force A-1A at Mendoza, Argentina, 2005 In the early stages of development, various different powerplants and engine configurations were studied to power the type; both twin-engine and single-engine approaches were considered. The use of US-sourced engines had been promptly discounted to avoid any potential restrictions on export sales of the overall aircraft.[2] Amongst the engines examined were the Turbo-Union RB199 (as used by the larger Panavia Tornado), the Rolls-Royce Turbomeca Adour, Rolls-Royce Viper, and the Rolls-Royce Spey engine.[2] In 1978, the Spey 807 model, which featured several additional improvements, was selected to power the new aircraft.[2]

Key features that were reportedly emphasised in the design process of the new aircraft were accessibility and survivability; the AMX had to be able to sustain a single failure to any onboard system without any performance degradation.[2] To achieve this, key systems are duplicated and vital systems are protected; the use of cockpit armor was considered but ultimately discounted due to the expense involved.[2] The detailed definition phase of the project was completed in March 1980.[1]

A total of seven flight-capable prototypes were produced for the test program, three by Aeritalia, two by Aermacchi, and two by Embraer, as well as two static airframes. The first prototype, assembled in Italy, made its maiden flight on 15 May 1984. This first aircraft was lost on its fifth flight in an accident, resulting in the death of its pilot.[4] Aside from this early loss, testing progressed smoothly and without further incident.[5] The first Brazilian-assembled prototype made its first flight on 16 October 1985. On 11 May 1988, the first production aircraft performed its first flight.[6] Deliveries of production aircraft to Italy began in 1988,[4] the first examples were delivered to the Brazilian Air Force during the following year.[7] On 14 March 1990, the prototype two-seat AMX made its first flight.[6]

Design

An AMX performing a display at the 2008 Royal International Air Tattoo The AMX is a conventional shoulder-winged monoplane. It is composed primarily of aluminium and manufactured using traditional construction methods, however elements such as the tail fin and elevators use carbon fibre composite materials.[1] For its size, a large proportion of the AMX's internal space is allocated to avionics and onboard computer systems, both the navigation and attack systems are computerized.[8] For accessability and ease of maintenance, all avionics are installed directly in bays beneath the cockpit in a manner in which they can be worked upon at ground level without the use of support platforms.[2]

Drawing on experience from the Panavia Tornado, the AMX is equipped with a hybrid flight control system; a fly-by-wire control system is employed to operate flight control surfaces such as the spoilers, rudder and variable incidence tailplane, while the ailerons and elevators are actuated via a dual-redundant hydraulic system. Manual reversion is provided for the ailerons, elevator and rudder to allow the aircraft to be flown even in the event of complete hydraulic failure; either control system can act independent of one another.[9][10] The wing is fitted with both leading edge slats and trailing edge flaps and overwing spoilers ahead of the flaps. The spoilers can function as airbrakes and to negate lift; improving take-off and landing performance as well as manoeuvrability during flight.[11]

A single Rolls-Royce Spey turbofan engine serves as the AMX's powerplant. During the aircraft's development, the Spey was heavier and less modern than some of the available alternatives, but it was considered to be reliable, relatively cheap and was free of export restrictions that would be imposed by using American engines.[2][12] The Spey engine also enabled for the use of a simplified round-lipped inlet design. The rear fuselage is detachable in order to gain access to the engine. Separate consortia in both Brazil and Italy manufactured the Spey for the AMX.[11] Unusual for a strike aircraft of the era, no attempt was made to develop the aircraft to fly at supersonic speeds.[1]

An AMX and several munitions on display at the Paris Air Show, 1989 Brazilian and Italian aircraft differ considerably in their avionics, Italian aircraft being equipped with various NATO systems which were considered redundant in the South American theatre.[8] AMXs in Brazilian service are often fitted with one of three pallet-mounted sensor packages, which contain various vertical, oblique, and forward-facing cameras, for performing the aircraft's secondary aerial reconnaissance role.[6][8] A simple ranging radar is equipped for targeting purposes, however the specific radar also differs between both operators.[11] The flight system employs a GE Avionics flight control computer.[13] Extensive electronic countermeasure (ECM) are fitted to protect the aircraft, include passive receiver antenna on the tailfin and an active jammer pod that is typically mounted on one of the aircraft's hardpoints.[11]

Various munitions could be mounted on the one centerline and four under-wing hardpoints, including bombs, missiles and rockets; payloads of up to 2,000 lb may be carried upon the centerline and the two innermost under-wing pylons, while the outer pylons can carry up to 1,000 lb.[8] All four of the under-wing hardpoints are plumbed for drop tanks to extend the aircraft's range, Italian aircraft are also fitted with a fixed aerial refueling probe.[11] Optical reconnaissance pods can be carried externally on the centerline hardpoint.[6] Wingtip rails are provided for infrared guided air-to-air missiles such as the AIM-9 Sidewinder and MAA-1 Piranha. Italian aircraft are fitted with a M61 Vulcan 20 mm rotary cannon on the port side of the lower fuselage.[8] The United States denied the sale of the M61 to Brazil, thus its AMXs are instead fitted with two 30 mm DEFA 554 revolver cannons.