Eurocopter AS355 Écureuil 2

AS355 Écureuil 2/Twin Squirrel/TwinStar
An AS355 departs Toulouse–Blagnac Airport
Role Light utility helicopter
National origin France
Manufacturer Aérospatiale
Eurocopter
Airbus Helicopters
First flight 27 June 1974
Status In service
Produced 1975-present
Developed from Eurocopter AS350 Écureuil
Developed into Eurocopter AS555 Fennec 2

The Eurocopter (now Airbus Helicopters) AS355 Écureuil 2 (or Twin Squirrel) is a twin-engine light utility helicopter originally manufactured by Aérospatiale in France (later part of Eurocopter Group, now Airbus Helicopters). The AS355 is marketed in North America as the TwinStar.

Design and development

Development at Aérospatiale began in the early 1970s to replace the Aérospatiale Alouette II, and the first flight took place on 27 June 1974.[1] A twin-engined version, known as the Écureuil 2, Twin Squirrel, or in North America as the TwinStar, first flew on 28 September 1979.[2]

Despite the introduction of the Eurocopter EC130 in 2001, production of both the AS350 and AS355, and of their AS550 and AS555 Fennec militarized counterparts, was continued for some time. In 2007, the more capable AS355 NP variant with FADEC engines was introduced to service. In September 2015, Airbus Helicopters announced that it was to terminate the manufacture of the AS355 as part of an effort to focus on stronger-selling rotorcraft – production of the AS350 is to continue. Production of the AS355 is to continue through 2016 until the existing order backlog is fulfilled.[3]

Variants

Twin engine

AS355N Twin Squirrel
AS355 Ecureuil 2
BBC News AS355 G-TVHD
AS355
Prototype of the twin-engined Écureuil 2 or Twin Squirrel.
AS355 E
Initial production version, with single hydraulics, powered by two Allison 250-C20F turboshaft engines.
AS355 F
Improved version, with dual hydraulics and increased maximum weight of 2,300 kg (5,070 lb).
AS355 F1
Powered by two Allison 250-C20F engines, 2,400 kg (5,291 lb) Maximum weight.
AS355 F2
Powered by two Allison 250-C20F engines, 2,540 kg (5,600 lb) Maximum weight and a yaw compensation system.
AS355 M
Initial armed version of AS355 F1.
AS355 M2
Armed version of AS355 F2. Superseded by AS555 Fennec.
AS355 N Ecureuil 2
Version fitted with two Turbomeca Arrius 1A engines and a Full Authority Digital Engine Control (FADEC) system for better M.T.O.W (2,600 kg or 5,732 lb) and better single engine performance, tail rotor strake added along starboard side of tail boom for better yaw authority.
AS355 NP Ecureuil 2
Introduced in 2007, this version is fitted with two Turbomeca Arrius 1A1 turboshaft engines and a new AS350 B3-based main gearbox, increasing maximum take-off weight to 2,800 kg (6,173 lb).[4]
HB.355F Esquilo Bi
Assembled in Brazil by Helibras (part of Eurocopter).
HB.355N Esquilo Bi
Assembled in Brazil by Helibras.

Aftermarket conversions

Heli-Lynx 355FX1
Powered by the Allison C20F engine. FAA, TC, and EASA approved.
Heli-Lynx 355FX2
Powered by the Allison C20F engine. FAA,TC and EASA approved.
Heli-Lynx 355FX2R
Powered by the Allison C20R engine. FAA and TC approved.
Starflex AS355F1R
AS355 F1 powered by the Allison C20R engine. FAA, TC and EASA approved.
Starflex AS355F2R
AS355 F2 Powered by the Allison C20R engine with optimised tail rotor blades. FAA, TC and EASA approved.

Operators

The AS355 Écureuil 2 is used by both private individuals and companies, helicopter charter and training organizations as well as law enforcement and government use.

Military and government operators

 Algeria
 Argentina
 Belarus
 Brazil
 Cambodia
 Canada
 Djibouti
 Jamaica
 Malawi
 Malaysia
 New Zealand
 Russia
 Uruguay
 United States

Former operators

 Bophuthatswana
 Ireland

Accidents and incidents

VH-NTV in December 2010

Specifications (AS355F2)

Cockpit of AS355 F1 Ecureuil 2

Data from Jane's All The World's Aircraft 1988–89[25]

General characteristics

Performance

See also

Related development
Aircraft of comparable role, configuration and era

Related lists

References

Citations

  1. http://62.160.110.229/jrotor/73/latinamerica.html#I0000f69b
  2. Taylor 1988, p.61.
  3. Perry, Dominic. "Airbus Helicopters ditches AS355 light twin." Flight International, 4 September 2015.
  4. Eurocopter Press Release – Eurocopter Upgrades Its Most Affordable Twin, The AS355 Ecureuil/TwinStar
  5. 1 2 3 4 5 6 7 "World Air Forces 2016". Flightglobal Insight. 2016. Retrieved 28 May 2016.
  6. "Argentine Coast Guard Receives its First Ecureuil". Air International. Vol. 80 no. 3. March 2011. p. 28. ISSN 0306-5634.
  7. "Государственный пограничный комитет вооружается европейскими вертолетами". .tut.by. Retrieved 1 March 2013.
  8. "Ontario Provincial Police upgrade from AS355F2 to EC135P2+". helihub.com. Retrieved 1 March 2013.
  9. "Ontario Provincial Police AS-355F". Demand media. Retrieved 1 March 2013.
  10. "JDF AS-355". jdfmil.org. Retrieved 1 March 2013.
  11. "Royal Malaysian Police wants more helicopters". helihub.com. Retrieved 1 March 2013.
  12. "NZ Civil Aircraft". nzcivair .com. Retrieved 1 March 2013.
  13. "Russian Military Plans to Buy Foreign Helicopters". rian.ru. Retrieved 1 March 2013.
  14. "AS355 NP Overview". eurocopterusa.com. Retrieved 1 March 2013.
  15. "World's Air Forces 1987 pg. 28". flightglobal.com. Retrieved 1 March 2013.
  16. "About the Air Support Unit". garda.ie. Retrieved 1 March 2013.
  17. "Pilot disorientated on impact". BBC News. Retrieved 17 September 2007.
  18. "Bulletin No:2/2000 Aerospatiale AS355 F1 Ecureuil II G-MASK" (PDF). Air Accident Investigation Board.
  19. "UK Helicopter crash kills three". BBC News. 27 July 1998. Retrieved 4 January 2010.
  20. "Millionaire Chelsea fan and his son die in helicopter crash". Daily Mail. 2 May 2007. Retrieved 15 August 2010.
  21. "Collision with terrain – Aérospatiale Industries helicopter, VH-NTV, near Lake Eyre, SA, 18 August 2011". Australian Transport Safety Bureau. 19 August 2011. Retrieved 20 August 2011.
  22. "ABC chopper crash probe could take a year". ABC News. Australian Broadcasting Corporation. 19 August 2011. Retrieved 20 August 2011.
  23. Helicopter crash in Belarus kills 5
  24. "Missing helicopter: Police launch Snowdonia ground search". BBC News.
  25. Taylor 1988, pp.60—62.
  26. Max slung load

Bibliography

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