11/30/2011. Dornier developed the Tragflügel Neuer Technologie (TNT, New-Technology Wing) with support from the German Federal Ministry of Research and Technology. The first phase of the TNT program, including design, aerodynamic and structural studies, began in mid-1975 and was followed by the engineering and construction of the supercritical wing, and finally its installation on the test bed aircraft, a Do 28 D-2 Skyservant.
This was modified by extending the center-fuselage 4 ft 5.5 in (1.36 m) and installing a longer nose; fitting standard Alpha Jet landing gear in a non-retractable form; and fitting two 715 shp Garrett-AiResearch TPE 331-5-2520 turboprop engines, one on each wing. The first flight of this research aircraft, registered D-IFNT, was made on June 14, 1979. The aircraft is presently preserved at the Dornier Museum.