Based on the earlier IAR 21 and in particular the IAR 22 but the design was simplified to allow for mass-production. The IAR 27 was a braced low-wing monoplane powered by a 1800NaN0 IAR 6-G1 piston engine and it had two open cockpits in tandem. More than 200 aircraft were built and they served with both civil and military training schools in Romania.