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Citation S/II, CE-S550
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Citation S/II, CE-S550

Data based on latest manufactured year
Aircraft Category: Class 2


The Citation was introduced in 1972 as a low-cost, pressurized, fan-powered business aircraft. It was designed to operate from smaller fields previously accerssable only to light turboprop or piston-powered aircraft. The improved Citation II was introduced in 1977. It incorporated a fuselage stretch of 3.75ft, increased fuel and baggage capacity, and Pratt & Whitney of Canada JT15D-4 turbofan engines. The Citation II was replaced in 1984 by the Citation S/II, powered by the new JT15D-4B engine variant which offered greater thrust at higher altitudes. The S/II also featured a new supercritical wing for reduced high-speed drag and was equipped with a fluid de-icing system in place of the pneumatic boots found on earlier Citations. The Citation S/II accomplished its first flight in February 1984 and received FAA certification in July 1984. It continued in production through 1988 when it was discontinued after a run of 159 units in favor of the newly re-introduced Citation II.


The Citation S/II is powered by a pair of Pratt & Whitney of Canada JT15D-4B turbofan engines rated at 2,500lbs. of thrust each at takeoff power. Inspection interval on the engines is 3,500 hours.


Standard equipment for the Citation S/II included dual Collins 20A radios and VIR 30 navigation systems, Sperry flight director/autopilot with vertical navigation and altitude preselect, and a Bendix RDR 1100 weather radar. A Sperry EFIS was available as an option.

Design Features

The Citation S/II is a medium-range twin-turbofan powered business aircraft configured as a low, straight-wing monoplane with a conventional empennage which utilizes a slightly swept vertical stabilizer. The airframe is of aluminum monocoque construction. The retractable tricycle landing gear has a single wheel on each unit. Improvements over earlier Citations include a high aspect-ratio wing with a supercritical airfoil section and a fluid de-icing system. Aerodynamic refinements combined with the improved JT15D-4B turbofans give the S/II slightly greater speed and range than earlier Citations models.


The Cessna Citation S/II was offered with standard six and nine-passenger configurations. Maximum cabin height is 4.8ft., cabin width is 4.9ft., floor width is 3.2ft. and overall cabin length is 16ft. for a total cabin volume of 263 cubic feet. The Citation S/II is marginally quieter than earlier Citations, due in part to the relocation of the engines further aft on the fuselage.
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