Variants Mitsubishi MU-300 Diamond I Initial model, ICAO designator MU30. Two prototypes and 89 production aircraft built, 56 in active use as of 2014. Mitsubishi MU-300-10 Diamond II Improved version of Diamond I; 11 built, all subsequently redesignated as Beechjet 400s. Beechcraft Model 400 Beechjet The Diamond II built after Beechcraft bought the MU-300 production rights from Mitsubishi. 54 built in addition to the original 11 Diamond IIs. ICAO designator BE40. Model 400A Upgraded model, initially produced as the Beechcraft Beechjet 400A, then Raytheon Beechjet 400A, then Raytheon Hawker 400XP, then Hawker Beechcraft Hawker 400XP. One prototype converted from Model 400 and 593 built as of the end of 2009. ICAO designator BE40. Model 400T Military version of the Model 400A, 180 built for the United States Air Force as the T-1 Jayhawk and 13 built for the Japan Air Self-Defense Force. In Japanese service they are referred to as T-400. ICAO designator BE40. Hawker 400XPR A factory engineered and supported upgrade of Hawker 400XP, first flown May 2012, and certified in 2016. The conversion features new avionics, interior, winglets, and Williams FJ44-4A-32 engines. The upgrade can be performed in 12 weeks with a choice of Rockwell Collins Pro Line 4 to 21 or Garmin G5000 avionics. Hawker 400XPR increases ferry range to 2160nmi, provides better hot and high performance, and 16-20% decrease in specific fuel consumption. 400XPR has ICAO designator BE4W, which is shared with Nextant 400XT, a competing upgrade of Hawker 400 made by Nextant Aerospace. Specifications (Hawker 400XPR) See also References External links Hawker 400XP on the Hawker website 1980s United States business aircraft Hawker 0400 Twinjets Low-wing aircraft Mitsubishi aircraft T-tail aircraft Aircraft first flown in 1978