Testing of the glider showed no major handling problems, and in September 1968, construction began on a powered prototype, given the designation FMA IA 58 Delfín, but later renamed Pucará, to be powered by a pair of Garrett TPE331I/U-303 engines. (DINFIA had been renamed the "Fábrica Militar de Aviones" (FMA) earlier that year). The first prototype made its maiden flight on 20 August 1969, with a second prototype, with power switching to Turbomeca Astazou XVIGs, following on 6 September 1970. The first prototype was later re-engined with the Astazou, this engine being chosen for the production version, and a third production prototype followed in 1973. The first production model flew on 8 November 1974, with deliveries beginning in early 1976.