IA 63 Pampa: This designation is applied to the original Pampas manufactured by FMA after the Argentine Air Force initiated the programme in 1979. The Pampa was selected over six other competitors in early 1980 to replace the FMA-built Morane-Saulnier MS.760. Dornier of Germany provided technical assistance, leading to two static/fatigue test airframes and three flying prototypes being built. The first prototype made its maiden flight on 6 October 1984 and the first production aircraft first flew in October 1987. 14 were delivered to the air force from 1988. They equip 1 Escuadron of 4 Grupo de Caza at El Plumerillo, Mendoza. Although another 46 were planned to be ordered, only one was delivered and that was an aircraft assembled from existing components and delivered on 28 September 1999.
AT-63 Pampa Phase II: The basic AT-63 variant is the Phase II aircraft, which boasts a new processor for the Digital Electronic Control Unit (DECU) and a new avionics suite by Elbit, which consists of a MIL-STD-1553B databus, mission computer, Inertial Navigation System/Global Positioning System (INS/GPS) integrated weapons system, a liquid crystal Multifunction Display (MFD) in each cockpit and a front cockpit Head Up Display (HUD).
AT-63 Pampa Phase III: The Phase III aircraft is an advanced proposed version to have a structurally enhanced wing able to withstand +7/-3 g, a 1 928 kg (4 250 lb) thrust TFE731-40R engine, nose-mounted laser rangefinder, fin-mounted radar warning receiver, conformal chaff/flare dispensers and another two hardpoints on the outer wings, each rated at 170 kg (375 lb), for air to air missiles. It would also have strengthened landing gear to increase the maximum takeoff weight.