Bell 214ST

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Bell 214ST
Bell214STSuperTransporterN724HT.JPG
A Bell 214ST of Helicopter Transport Services
Role medium-lift helicopter
Manufacturer Bell Helicopter Textron
First flight February 1977
Introduction 1982
Status Production completed
Primary users Peruvian Air Force
Royal Brunei Air Force
Royal Thai Navy
Produced 1979-1993[1]
Number built 96[1]
Developed from Bell 214

The Bell 214ST is a medium-lift, twin-engine helicopter descended from Bell Helicopter's ubiquitous UH-1 Huey series. Though it shares a type number with the somewhat-related Bell 214, the 214ST is larger and of quite different appearance.

Design and development

The Bell 214ST was originally developed as a military project from the Bell 214B BigLifter, specifically for production in Iran and the development by Bell was funded by the Iranian government.[2] The fundamental difference was the replacement of the Model 214's single Lycoming LTC-4 turboshaft engine with two 1,625 shp (1,212 kW) General Electric T700 engines, to improve the helicopter's hot and high performance and improve safety. An interim twin-engine conversion of a Model 214 flew on 15 February 1977 in Texas,[3][4] Testing was successful, and Bell decided to press forward with a definitive twin-engine Bell 214ST, with a fuselage stretched by 30 in (76 cm) and a revised main rotor of greater diameter. Iran changed its production plans, with 50 Bell 214A and 350 214STs to be built at the new production plant to be set up at Isfahan, Iran.[5]

Work started on three conforming prototypes in 1978.[6] The overthrow of the Shah in 1979 resulted in the cancellation of Iran's orders. By this time the new helicopter had attracted sufficient interest from other potential customers for Bell to continue with the project and build the 214ST at their Dallas-Fort Worth facility instead. As a result, it was launched as a civil helicopter, rather than a military one.[2][7][8]

File:Bristow - Bell 214ST SuperTransport.jpg
A Bristow Bell 214ST over Aberdeen, Scotland

The first of the three full 214ST prototypes flew on 21 July 1979.[8] Manufacturing of production 214STs began in 1981. Type certification from the FAA and CAA for visual and instrument flight rules was awarded in 1982.[9] The military variant followed into production with helicopter deliveries commencing in 1982.[3]

The Bell 214ST included major design changes from the Bell 214. The Bell 214ST has a larger, stretched fuselage with seating for 16-18 passengers,[10][11] and two 1,625 shp (1,212 kW) GE CT7-2A engines.[12] The helicopter introduced some ground-breaking innovations for Bell, including a one-hour run-dry transmission, fiberglass rotor blades, elastomeric rotorhead bearings, and the option of either skid or wheeled landing gear.[2] The helicopter has a cockpit door and a large cabin door on each side. The 214ST has a fuel capacity of 435 US gallons (1,650 L). An auxiliary fuel system could be added.[11]

The Model 214ST is the largest helicopter that has been built by Bell.[10] The ST was originally an acronym for "Stretched Twin", but was later changed to "Super Transporter".[10][12] Bell built a total of 96 214STs with production ending in 1993.[1]

The military operators included: Iraq (48),[13] Brunei (1), Peru (11), Thailand (9) and Venezuela (4).

The 214ST was replaced on the Mirabel plant production line by the smaller Bell 230.[3]

Operators

An Iraqi Air Force Bell 214ST
File:British Caledonian Helicopters Bell 214ST.jpg
A British Caledonian Helicopters Bell 214ST

Military operators

 Brunei
 Peru
 Thailand

Civil operators

 Canada
 United States
 Oman

Former operators

 Norway
 Iraq
 United Kingdom
 Venezuela

Specifications (214ST)

430px

Data from International Directory of Civil Aircraft,[10] Complete Encyclopedia of World Aircraft[6]

General characteristics

  • Crew: 1 or 2
  • Capacity: Internal: 16 or 17 passengers or equivalent cargo; External: 8,000 lb (3,630 kg) sling load
  • Length: 49 ft 4 in (15.03 m)
  • Rotor diameter: 52 ft 0 in (15.85 m)
  • Height: 15 ft 11 in (4.84 m)
  • Disc area: 2,124 ft² (107.3 m²)
  • Empty weight: 9,481 lb (4,300 kg)
  • Max. takeoff weight: 17,500 lb (7,938 kg)
  • Powerplant: 2 × General Electric CT7-2A turboshaft, 1,625 shp (1,215 kW) each

Performance

See also

Related development
Aircraft of comparable role, configuration and era

References

  1. ↑ 1.0 1.1 1.2 "Bell 214ST Supertransport" (subscription article). Jane's Helicopter Markets and Systems. Jane's Information Group, November 28, 2011.
  2. ↑ 2.0 2.1 2.2 Apostolo, Giorgio. The Illustrated Encyclopedia of Helicopters, p. 54. New York: Bonanza Books, 1984. ISBN 0-517-43935-2.
  3. ↑ 3.0 3.1 3.2 Green, William, Observers Aircraft, p. 228. Frederick Warne Publishing, 1991. ISBN 0-7232-3697-6.
  4. ↑ Air International October 1982, p. 165.
  5. ↑ Air International October 1982, pp. 165–166.
  6. ↑ 6.0 6.1 Donald, David, ed. "Bell Model 214ST". The Complete Encyclopedia of World Aircraft. Barnes & Nobel Books, 1997. ISBN 0-7607-0592-5.
  7. ↑ Lambert Flight International 30 June 1979, p. 2345.
  8. ↑ 8.0 8.1 Air International October 1982, p. 166.
  9. ↑ 9.0 9.1 Pelletier, Alain J. Bell Aircraft Since 1935. US Naval Institute Press, 1992. ISBN 1-55750-056-8.
  10. ↑ 10.0 10.1 10.2 10.3 Frawley, Gerard. The International Directory of Civil Aircraft, 2003-2004, p. 44. Aerospace Publications Pty Ltd, 2003. ISBN 1-875671-58-7.
  11. ↑ 11.0 11.1 Lambert, M. "Bell 214ST". Jane's All the World's Aircraft 1990-91. Jane's Information Group, 1990. ISBN 0-7106-0908-6. (subscription article)
  12. ↑ 12.0 12.1 Green, William. Observers Aircraft, p. 224. Frederick Warne Publishing, 1987. ISBN 0-7232-3458-2.
  13. ↑ Timmerman, Kenneth R. The Death Lobby: How the West Armed Iraq. New York: Houghton Mifflin Company, 1991.
  14. ↑ 14.0 14.1 Lua error in package.lua at line 80: module 'strict' not found.
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External links

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