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Cessna Citation III

(Redirected from Cessna 670)

The Cessna Citation III is an American business jet produced by Cessna and part of the Citation family. Announced at the October 1976 NBAA convention, the Model 650 made its maiden flight on May 30, 1979, received its type certification on April 30, 1982 and was delivered between 1983 and 1992. The cheaper Citation VI was produced from 1991 to 1995 and the more powerful Citation VII was offered between 1992 and 2000; 360 of all variants were delivered, while a proposed transcontinental variant, the Citation IV, was canceled before reaching the prototype stage. An all new design, the Citation III had a 312 sq ft (29 m2) swept wing for a 22,000 lb (10 t) MTOW and a 2,350 nmi (4,350 km) range, a T-tail and two 3,650–4,080 lbf (16.2–18.1 kN) TFE731 turbofans. Its fuselage cross section and cockpit were kept in the later Citation X, Citation Excel and Citation Sovereign.

Citation III / VI / VII
Citation III
General information
TypeBusiness Jet
National originUnited States
ManufacturerCessna
Number built360: 202 III, 39 VI,[1] 119 VII[2]
History
Manufactured1983-2000
Introduction date1983 (III)
First flightMay 30, 1979 (III)
Developed intoCitation X

Design and development

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Viewed from below, showing wing sweep
 
The 650 has a T-tail and two turbofans

In 1974, Cessna studied a long range model 700 stretch of its original Citation I powered by three JT15Ds called Citation III, with a 17,500 lb gross weight, an 8,000 lb empty weight and a 7,500 lb fuel capacity leaving 2,000 lb for the occupants, and targeting 1978 deliveries.[3] This would have gave it a transcontinental range.[4]

Cessna announced the 10 to 15 passengers, $2.5 million Citation III at the Fall 1976 NBAA convention.[5] Scheduled for 1980, the model then presented had a cruciform tail and a cockpit similar to previous Citations. It would be powered by two TFE731 and would be equipped with a supercritical 35° swept wing. Its maximum cruise was targeted for 470 kn, the long-range version had a 19,300 lb gross weight and would cover 3,000 nmi. The programme was to cost up to $50 million to launch.[6]

By 1978 it had a new cockpit and a T-tail, the wing had an area of 312ft² (29m2) and an aspect ratio of 8.94, and an ER version targeted a MTOW of 18,300 lb (8,30 1kg) and an empty weight of 9,400 lb (4,264 kg).[7] Assembly of the first production aircraft began in January 1979 and the first prototype made its maiden flight in May.[8] However, the program was dealt a setback when the Federal Aviation Administration (FAA) enacted new type certification regulations stemming from the May 1979 crash of American Airlines Flight 191, in which an engine separation on takeoff caused cascading flight control and warning system failures. The new regulations required aircraft manufacturers to mitigate failures of other aircraft systems that could result from the failure or separation of a jet engine, and the FAA demanded that the Citation III be modified to comply, requiring Cessna to make extensive changes to the fuel system, to increase separation between hydraulic and flight control lines, and to increase system redundancy. These changes in turn required the capacity of the aft fuselage fuel tank to be reduced by 900 lb (410 kg)—11% of the aircraft's total intended fuel load—thus rendering it infeasible for the jet to meet its range target.[9]

The second prototype first flew in April 1980. By July, certification was put back by six months and first deliveries were scheduled 11 months later than originally planned. $40 million were spent on R&D and $25 million for certification, for a total spending of $150 million by first delivery including tooling.[10] By October, the two prototypes had logged 400 hours in 372 flights and FAR-25 certification was expected in April 1982 with first deliveries in October.[11] The certification delays and loss of range caused by the design changes, together with economic factors stemming from the early 1980s recession, resulted in a number of early-order cancellations.[12] Despite this, the initial late 1982 production rate of one per month was expected to grow to seven per month by 1985.[11]

The FAA approved the type certificate of the Model 650 Citation III on April 30, 1982.[13] It was the first aircraft with a supercritical wing to be type certificated in the United States.[14] The aircraft is flown by a crew of two and it can seat up to 13 passengers but a typical corporate interior will seat six to eight passengers.[8]

It was developed in seven years for $240 million. The first production model, owned by golfer Arnold Palmer, set time to altitude aircraft records of 12 min 1 s to 12,000 m (39,350 ft), and 23 min 43 s to 15,000 m (49,200 ft), and an airspeed record from Gander Airport to Paris le Bourget in 5 h 13 min, averaging 429 kn.[15] Production continued for nine years until 1992, with a total of 202 Citation IIIs being built.[1] By 2018, The Citation III/VI/VII can be had for $0.5-1.5 million.[16]

The aircraft was equipped with a then-novel safety feature: in the event of an uncontrolled decompression of the cabin, the autoflight system's Emergency Descent Mode (EDM) activates (if the aircraft is above 34275 feet, the cabin altitude exceeds 13500 feet, and the autopilot is engaged) and places the aircraft in a 35° left bank for approximately 48 seconds to turn 90 degrees, and descends at VMO-10 until reaching an altitude of 15,000 ft (4,600 m). However, the pilot has to manually deploy speedbrakes and spoilers, and retard throttles in order to achieve maximum descent rate.

Variants

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Citation IV: cancelled stretch

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In 1988 Cessna studied a 4 ft (1.2 m) stretch, longer range Citation IV to better compete with the BAe 125 with new engines, either Garretts or Pratt & Whitney PW300s. At the time, the 473 kn, 2,385 nmi range Citation III was selling for $6.125 million.[17] Cessna launched the $8.8 million Citation IV at the October 1989 NBAA convention in Atlanta. It was expected to fly in early 1992, to be certified at the end of the year and to enter service in mid-1993. Powered by Garrett TFE731-4s, wingspan increased by 10% to 58.7 ft (17.9 m) and wing area was up almost a quarter. Fuel capacity increased from 7,330 to 8,700 lb (3.32 to 3.95 t), max takeoff weight attained 24,000 lb (10.9 t) and the cabin was 38 in (97 cm) longer. Performance was increased and it had a 2,710 nmi (5,020 km) transcontinental range.[18] In 1990, Cessna cancelled the bigger, longer range and more expensive Citation IV to offer the cheaper VI and more capable VII.[19] No Citation IV prototype was ever completed; had it reached production, the aircraft would have been certified as the Model 670.[20]

Citation VI: lower cost

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For $1.4 million less than the $8.1 million III, the Citation VI has a standard interior and was to be delivered from April 1991.[19] The Citation VI was certificated under an amendment to the original Model 650 type certificate.[13] It first flew in 1991 and 39 were built before it was discontinued in May 1995.[1] Cessna found that few potential customers would settle for a relatively austere budget-focused mid-sized jet; most were focused on luxury and prestige, and were more likely to either buy a preowned business jet with the features they wanted, or pay the premium for the more upscale cabin furnishings offered in the Citation VII.[21]

Citation VII: premium version

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For $1.65 million more than the III, the Citation VII has more powerful engines to improve the payload-range and hot and high performance.[19] The cabin interior was customized to each buyer's preference, with a wide range of trim and seat fabrics, galley equipment, and in-flight entertainment options, and the aircraft came with a full-width aft lavatory that could be outfitted as a dressing room.[21] It first flew in February 1991 and was certificated in January 1992[1] under an amendment to the original Model 650 type certificate.[13] In 1996 Executive Jet Aviation ordered 20 for its Netjets fractional ownership programme. After the launch of the $12 million Citation Sovereign due for certification in the third quarter of 2003 and first delivery for the first quarter of 2004, the final Citation 650 was set to roll off the assembly line on 15 September 2000,[22] 119 were built.[2]

Operators

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Spanish Navy Citation VII, doors open

Military operators

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  Spain

Specifications (III/VI)

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A TFE731-4R of a Citation VII

Data from Frawley[1]

General characteristics

  • Crew: 2
  • Capacity: 6-9 Passengers
  • Length: 55 ft 5 in (16.90 m)
  • Wingspan: 53 ft 6 in (16.31 m)
  • Height: 16 ft 10 in (5.12 m)
  • Wing area: 312 sq ft (29.0 m2)
  • Aspect ratio: 9.17
  • Empty weight: 11,810 lb (5,357 kg) operating empty: 12,200lb (5534kg), VII: 11,720lb (5316kg)
  • Max takeoff weight: 22,002 lb (9,980 kg) VII: 22,450lb (10,183kg)
  • Powerplant: 2 × Garrett TFE731-3B Turbofans, 3,650 lbf (16.2 kN) thrust each VII: 4080lbf (18.2kN) TFE731-4R

Performance

  • Maximum speed: Mach MMo Mach .851 (491 kn; 909 km/h)[13]
  • Cruise speed: 472 kn (543 mph, 874 km/h) max, VII: 476kn (881km/h)
  • Range: 2,348 nmi (2,702 mi, 4,348 km) 2 crew and 4 passengers, VII: 2220nmi (4110km) with 6 passengers
  • Service ceiling: 51,000[13] ft (16,000 m)
  • Rate of climb: 3,805 ft/min (19.33 m/s) initially, VII: 4,442 ft/min (22.57 m/s)

See also

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Related development

Aircraft of comparable role, configuration, and era

References

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Notes

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  1. ^ a b c d e Gerard Frawley. "Cessna Citation III, VI & VII". The International Directory of Civil Aircraft – via Airliners.net.
  2. ^ a b "Cessna 650 Citation VII specs". Aviation Safety Network. 23 July 2011.
  3. ^ "Third engine for citation". Flight International. 14 Nov 1974.
  4. ^ "Cessna looks ahead". Flight International. 5 Dec 1974.
  5. ^ "NBAA Convention News looks back". AIN online. October 5, 2001.
  6. ^ "Cessna plans three-stage Citation development". Flight International. 2 Oct 1976.
  7. ^ "Citation III to fly in May". Flight International. 7 Oct 1978.
  8. ^ a b "Citation III: technical description". Flight International. 24 Nov 1979.
  9. ^ Szurovy 1999, pp. 42–44.
  10. ^ "Citation III certification delay explained to customers". Flight International. 26 July 1980.
  11. ^ a b "Big business at Kansas City". Flight International. 11 Oct 1980.
  12. ^ Szurovy 1999, p. 44.
  13. ^ a b c d e "Type Certificate No. A9NM" (PDF). FAA. June 16, 2015.
  14. ^ Szurovy 1999, p. 41.
  15. ^ "Citation III enters service - Flight test". Flight International. 18 June 1983.
  16. ^ Mark Huber (December 2018). "For many models, market hitting the apex" (PDF). Aviation International News. pp. 20–21, 24. Archived from the original (PDF) on 2018-12-27. Retrieved 2018-12-27.
  17. ^ "Citation's new range". Flight International. 8 Oct 1988.
  18. ^ "Cessna steals NBAA limelight". Flight International. 14 October 1989.
  19. ^ a b c "Corporate aircraft buyers'guide". Flight International. 21 Nov 1990.
  20. ^ Simpson, R.W. (1991). Airlife's General Aviation. Shrewsbury, England: Airlife Publishing. p. 111. ISBN 1-85310-194-X.
  21. ^ a b Szurovy 1999, p. 47–48.
  22. ^ "Citation VII assembly comes to an end". Flight International. 19 Sep 2000.
  23. ^ Yanez, Roberto; Rodriguez, Alex (February 2018). "Flotilla de Aeronaves". Air International. Vol. 94, no. 2. pp. 78–83. ISSN 0306-5634.

Bibliography

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  • Szurovy, Geza (1999). Cessna Citation Jets. Osceola, Wisconsin: MBI Publishing Company. ISBN 0-7603-0785-7.
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