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. 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). 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.