The Diamond D-JET is a composite, five-seat, single-engine jet aircraft produced by Diamond Aircraft Industries. The D-JET was initially to be powered by one Williams FJ-33-4A-15 turbofan engine. That 1,564 lbf (6.96 kN) thrust engine was found in early 2008 to produce insufficient bleed air for cabin pressurization and other services. As a result a decision was made to switch to the Williams FJ-33-4A-19 turbofan engine, which produces 1,900 lbf (8.5 kN) of thrust instead.
The first flight of the D-JET was made on April 18, 2006 from the London International Airport (ICAO: CYXU) in Ontario, Canada the homebase of Diamond’s North American division. The flight was piloted by test pilot Gérard Guillaumaud and lasted 1:06 hours. The aircraft's public debut was at Oshkosh in July 2006. After completion of flight testing, Diamond expects full certification in the middle of 2009 with deliveries starting at the same time.
The Diamond D-JET, partially assembled at the Oakland NBAA, November 8, 2007.
On Friday, July 20, 2007 Diamond Aircraft announced the roll out of its second D-JET, serial number 002. Serial number 002 is the first D-JET intended to conform to the expected production configuration in its structural layout and aerodynamic design. D-JET prototype serial number 002 first flew on Friday 14 September 2007. It was joined by D-JET Serial Number 003, which first flew on April 15, 2008.