A third prototype YT-27, further modified from the previous two prototypes, received the civilian registration mark PP-ZDK, and flew on 16 August 1982. The following month, the prototype made its international debut at the Farnborough Airshow, crossing the Atlantic just a few days after its maiden flight. The type was designated by the Brazilian Air Force as the T-27 for training purposes and the AT-27 for ground attack in counter-insurgency missions. Inspired by one of the most well-known birds in the Amazon rainforest, a Brazilian Air Force cadet suggested the aircraft be named the "Tucano" (), and this was approved on 23 October 1981.