UC-35

UC-35

The UC-35 is a military version of an executive passenger and transport aircraft based on the Cessna Citation V. It is primarily used by the US Air Force, US Navy, US Army and US Marine Corps for several functions, including range clearance, embassy support, medical evacuation, VIP transport, passenger and light cargo transport. The Cessna Citation V (Model 560) is a turbofan-powered small-to-medium sized business jet built by the Cessna Aircraft Company in Wichita, Kansas. A stretch of the Cessna Citation II series, the Citation V aircraft was evolved into the Citation Ultra, the Citation Encore, and the Citation Encore+ models.

Design and development

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 By the time the aircraft was superseded in 1994, 262 had been built.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 Powered by Pratt & Whittney JT15D-5D engines with 3045 lbs of thrust 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 mulifunction display. In 1994, the Ultra was named Flying magazine’s “Best Business Jet”. The Ultra was produced from 1994–1999. Both the Citation V and Ultra hold 5816 pounds of fuel.

The UC-35A is the United States Army designation and UC-35C is the United States Marine Corps designation for the Citation Ultra, which replaced older versions of the C-12 Huron.

Another version of the Model 560 is the OT-47B “Tracker”, five of which were purchased by the Department of Defense for use in drug interdiction reconnaissance operations, based at Maxwell Air Force Base. The OT-47B utilizes the F-16’s APG-66(V) fire control radar system and the WF-360TL imaging system. The OT-47Bs have been operated on loan to the Colombian Air Force[6] and Peruvian Navy.

Citation Encore/Encore+

Five years later, in 1998, the Model 560 was upgraded again as the Citation Encore, with Pratt & Whitney Canada PW535A engines and a decrease in fuel capacity to 5,440 pounds, 360 pounds less than the Ultra’s, but it has more range than the Ultra-1,700 nmi with NBAA IFR reserves. The reduction in fuel tank size allowed Cessna to fit the Encore with soft-landing, trailing link, main landing gear, a welcome change for pilots who griped about the notorious kerplunk touchdown characteristics of the stiff-legged earlier Citations aircraft. In addition, the wheel track has been narrowed 3.7 feet for better ground tracking and more mannerly crosswind landing behavior. The Encore’s standard equipment list have been increased and many systems have been upgraded. Bleed air is used to anti-ice the wing leading edge, and several boundary layer energizers, plus a stall fence, have been added to the wing to improve stall characteristics. A digital pressurization controller reduces pilot workload and an improved wheel brake system offers better modulation. Redesigned interior fittings and passenger seats provide more seated headroom. New passenger service units provide more even airflow and temperature control. The Encore’s MTOW is bumped 330 pounds to 16,630 pounds, enabling it to carry five passengers with full fuel. The additional weight increases takeoff field length to 3,561 feet, compared with 3,180 feet for the Ultra. The much improved high altitude thrust output of the PW535 engines, however, allow the Encore to climb faster and cruise higher. Its maximum cruise altitude is FL 450. The Encore was certified in April 2000 with first delivery in late September 2000. The next upgrade was the Citation Encore+, with the addition of FADEC-controlled PW535B engines and Rockwell-Collins Pro Line 21 avionics suite. The Encore+ was certified by the FAA in December 2006, with deliveries of production aircraft expected in the first quarter of 2007.

The UC-35B is the Army designation and UC-35D is the Marine Corps designation for the Citation Encore.

Variants

  • Citation V: (Model 560), growth variant of the Citation II/SP JT15D-5A.
  • Citation Ultra: (Model 560) upgraded Citation V with JT15D-5D, EFIS instruments.
  • Citation Encore: (Model 560) upgraded Citation Ultra with PW535A engines and improved trailing-link landing gear.
  • Citation Encore+: (Model 560) upgraded Encore includes FADEC and a redesigned avionics.
  • UC-35A: Army and Air Force transport version of the V Ultra.
  • UC-35B: Army transport version of the Encore.
  • UC-35C: Marine Corps version of the V Ultra.
  • UC-35D: Marine Corps version of the Encore.
  • OT-47B “Tracker”: The DoD purchased five OT-47B models for drug interdiction reconnaissance.

Specifications (Cessna Citation Ultra):

Crew 2
Capacity 7 – 8 passengers
Length 48 ft 11 in (14.91 m)
Wingspan 52 ft 2 in (15.90 m)
Heigh 15 ft 0 in (4.57 m)
Wing area 342.6 ft² (31.83 m²)
Empty weight 9,395 lb (4,261 kg)
Gross weight
Max take off weight 16,300 lb (7,394 kg)
Power plant (Dry thrust)
2 × Pratt & Whitney Canada JT15D-5D turbofan, 3,045 lbf (13.55 kN) each
Power plant (Thrust with afterburner) 
Maximum speed (Sea level)
Maximum speed (High altitude) 430 knots (495 mph, 796 km/h)
Combat radius
Ferry range
1,960 nm (2,257 mi, 3,650 km)
Service ceiling
45,000 ft (13,715 m)
Rate of climb 4,230 ft/min (21.5 m/s)
Wing loading
Thrust/weight 0.374
Design load factor

Operators

Related Armament

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