The Chilean Air Force established an aircraft manufacturing arm, IndAer, in 1980, which began by assembling Piper PA-28 Dakotas and building the ENAER T-35 Pillán military light trainer, which was developed by Piper for manufacture in Chile.

A 115 hp (86 kW) Textron Lycoming O-235-N2C flat-four piston engine drove a two-bladed fixed-pitch propeller.

[9][10] By 1998, it was planned to assemble a modified version of the aircraft, powered by a 150 hp (110 kW) Textron Lycoming O-320-D2A engine, in a new factory in the Netherlands.

[11] In early 1999, Euro-ENAER was blaming poor weather and difficulties with the Joint Aviation Authorities for delays in certification for the Eaglet, whose unit price had now reached US$160,000, although the company was now forecasting annual sales of 50 per year in Europe and 200 a year in America.

[12] Euro-ENAER finally managed to certify the Eaglet in 2001, but the company announced it needed additional funding to start production.