(Vd) of by , causing the leading edge skin to tear apart, followed by a −30g dive, resulting in a complete disintegration of the airframe. Both the pilot and co-pilot were able to safely eject. The tailplane leading edge of the first prototype was modified, and requirements were cleared in 1983, after which it achieved a maximum diving speed of . 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. Further development EMB-312S An agreement was signed in May 1984 between Embraer and Short Brothers to modify the EMB 312 to meet a Royal Air Force requirement for a high-performance, turbo-prop trainer to replace the BAC Jet Provost issued in 1983. Short Brothers was responsible for the final assembly and licence-built 60% of the aircraft parts, although the wings, landing gear, and canopy were built in Brazil. In March 1985, after a competition with other types, the Short Tucano was declared the winner, with an order worth £126 million for 130 aircraft and an option for a further 15. As well as production for the Royal Air Force, the Short Tucano was exported to Kenya (12 Tucano Mk.51s) and Kuwait (16 Tucano Mk.52s). EMB-312H During the mid-1980s, as Embraer was working on the Short Tucano, the company also developed a new version designated the EMB-312G1. Also using a Garrett engine, the EMB-312G1 prototype flew for the first time in July 1986. However, the Brazilian Air Force showed no interest, and the project was dropped. Nonetheless, the lessons from recent combat use of the aircraft in Peru and Venezuela led Embraer to continue the studies. It also researched a helicopter attack version designated as the "helicopter killer" or EMB-312H. The study was stimulated by the unsuccessful bid for the Joint Primary Aircraft Training System program, in which Embraer teamed with Northrop Grumman. In 1991, one existing