successful testing period, the AMI contract for 44 aircraft was issued to Aeritalia (of which Fiat Aviazione had since become a part). In December 1975, the first production aircraft conducted its first flight. In April 1978, this same aircraft formally entered service with the AMI. Following on from its introduction by the AMI, the G.222 was procured as a tactical transport aircraft by various international customers, including Argentina, Nigeria, Somalia, Venezuela and Thailand. In December 1978, Aeritalia elected to transfer final assembly of the G.222 from Turin to Naples, at which point a total of 44 firm orders had been obtained for the type and one aircraft per month was being manufactured. Manufacturing of the G.222 was broken down into various companies; construction of the fuselage was performed at Naples, the center-section of the wing was produced by Piaggio, the wing panels were made by Macchi, the tail surfaces were built by SIAI-Marchetti, the engine nacelles by IAM, and the T64 engines were license-manufactured by Alfa Romeo and Fiat. Further development In 1977, Libya sought the purchase of 20 G.222s; this was vetoed by the U.S. Government, who had imposed an embargo on military arms and equipment to Libya, which included the G.222's T64 engines. To get around this restriction, Aeritalia developed a version of the G.222 powered by the Rolls-Royce Tyne engine and other US supplied equipment was replaced by European equivalents; the more powerful Tyne engine also reportedly gave this variant superior "hot and high" performance. The provision of alternative powerplants was viewed by Aeritalia as a measure to widen the overall appeal of the G.222; the Tyne engine also reportedly possessed greater growth potential than the T64 engine. In May 1980, the first G.222 equipped with the Tyne engine performed its maiden flight. Libya placed an order for 20 Tyne-powered aircraft instead, with deliveries commencing from 1980. In order to extend the effective operational lifespan of the type, some operators have carried out extensive upgrade programs of the G.222. In the aftermath of Italian humanitarian missions in Bosnia and Somalia, in 1996 the AMI began undertaking a major update program on their G.222 fleet; modifications include cockpit lighting changes for compatibility with Night Vision Goggles to enable night operations, increasing the aircraft's self-defense capabilities, new communications and navigation systems, and the removal of obsolete equipment. In July 2005, the Nigerian Air Force signed a $74.5 million contract