Citation V – After stretching the Citation I to make the II, Cessna decided to increase the size of the cabin again, stretching the fuselage by another 20 inches (510 mm), resulting in the largest member of the straight-wing family, the Model 560 Citation V. The first engineering prototype flew in August 1987, and certification was granted in December, 1988. The aircraft utilized the T-47A’s JT15D5A engines for extra performance. By the time the aircraft was superseded in 1994, 262 had been built. Citation Ultra In 1993, Cessna decided to update the Citation V design, and announced the Citation Ultra, with the main differences being in the engines, which were the latest JT15D-5D version, and the standard avionics suite, which was updated to the Honeywell Primus 1000 EFIS glass cockpit. The Primus 1000 replaced the standard “round dial” flight instruments with three CRT computer screens, one for each pilot and one center multifunction display. In 1994, the Ultra was named Flying magazine’s “Best Business Jet”. The Ultra was produced from 1994-1999.