The Citation Encore is a Citation Ultra with upgraded Pratt & Whitney PW535 engines that produce 3,400 pounds of thrust each. This is an increase of 355 pounds of thrust for each engine. There is no big change in performance but engine costs drop almost 20% and fuel costs drop 8%. The Encore was unveiled at the 1998 NBAA convention. The Encore has the same Honeywell Primus 1000 EFIS avionics suite used in the Ultra. The Encore was certified in 2000 and remained in production until 2006, when the Encore+ superseded it.