The Citation V (Model 560) is a development of the
Citation S/II, retaining the
supercritical airfoil and swept wing roots of that aircraft, but with a
fuselage stretch and recontoured interior for increased passenger space. The
passenger cabin is long, wide and high with a dropped
aisle, has seven windows on each side and accommodates a four-seat club plus three chairs and a closed, belted lavatory. The engines were changed to more powerful
Pratt & Whitney Canada JT15D-5A turbofans with of thrust, an overall increase of over the S/II that increased cruise speed to and
service ceiling to , although maximum range decreased from to due to slightly increased fuel consumption. Cessna also replaced the
fluid deicing system of the S/II with improved
pneumatic deicing boots for decreased weight and easier maintenance, and the
horizontal stabilizer span was increased slightly to compensate for the increased engine thrust. The Citation V was also the first Citation with an
electronic flight instrument system (EFIS) offered as standard equipment, albeit only on the
captain's side. A preproduction prototype flew in early 1986 and the first engineering prototype made its maiden flight in August 1987.