The Airbus Helicopters EC120 B Colibri is a 5-seat light utility helicopter powered by a single Turbomeca Arrius 2F turbine engine. The EC 120 B Colibri, also known as Hummingbird, was developed with simplicity of design and low costs of maintenance in mind. It makes extensive use of composite materials and modern avionics. The new generation of fenestron tail rotor takes part in the decrease in external noise level, which makes the EC120 B ideal for missions near settled areas. The project started in 1990 when Aerospatiale of France, CATIC of China and Singapore Aerospace agreed in forming a partnership to develop a new light helicopter, then designated P-120L. Definition phase of the original P120L was subsequently redesigned with 500 kg lower gross weight and new engine and rotor. The helicopter divisions of Aerospatiale from France and MBB from Germany merged in January 1992 to form the Eurocopter Group. In October 1992, development of the new helicopter started and in January 1993, Eurocopter designation EC 120 was given to the helicopter. Mid-1993, the design definition was completed and assembly of first of two prototypes began at Eurocopter France at Marignane in early 1995. Eurocopter EC120 prototype F-WWPA c/n 1 flew first on 9 June 1995. The second prototype (F-WWPD c/n 2) was flown 17 July 1996. Certification to JAR 27 was achieved on 16 June 1997. Production of the EC 120 began on a small scale in 1997 at Eurocopter France's Marignane facility, with the first production Colibri (F-WWPL c/n 1005) flying on 5 December 1997. The airframes are made in China and the final assembly line of the EC120 is at the Eurocopter Marignane factory in France. Next to the final assembly of the EC120 in France, a number of helicopters were assembled in Australia and Brazil. In 2006, Regourd Aviation in France obtained EASA certification for the modified EC120 "Voyager", an EC120 with auto-pilot, glass cockpit & integrated avionics. On 6 November 2015, Airbus Helicopters started flight tests with the H120 demonstrator F-WMXC powered by a cleaner, more efficient 4.6-liter high-compression diesel engine in place of the Turbomeca Arrius 2F turboshaft. These test flights were part of the European Clean Sky initiative’s Green Rotorcraft Integrated Technology Demonstrator (ITD) program that started in 2011. In addition to Airbus Helicopters, the project involved TEOS Powertrain Engineering and Austro Engine. Since March 2015, Airbus Helicopters uses “H120” as marketing designation for the EC120 B helicopters. Serial production of the Airbus Helicopters H120, originally the Eurocopter EC120 B, has officially ended. The last H120 helicopter on order was delivered in September 2017. Over 700 single-engine H120 Colibris have been delivered in more than 50 countries with more than 400 operators. The decision to stop production of the H120 was the result of Airbus Helicopters’ strategy to focus on markets where high-end technologies bring the most value to customers. The company therefore concentrate on further developing its offer in the intermediate single-engine segment with the H125 and H130 through continuous improvements of these two best-seller types.
In 2023 Airbus Helicopters launched new upgrades for the H120 such as new avionics, skidshoes and free Halon fire extinguishers.
The ICAO Aircraft Type Designator for both the EC120 or H120 and the HC120 is EC20.

As a result of the merger between the Eurocopter parents Aérospatiale-Matra; DaimlerChrysler Aerospace (DASA) and Construcciones Aeronàuticas Sociedad Anonima (CASA) in July 2000, the Eurocopter group became a division of the new formed EADS (European Aeronautic Defence and Space company). Taking off into 2014, EADS was rebranded as "Airbus Group". Uniting all its activities under a single brand, its helicopter division Eurocopter was rebranded as Airbus Helicopters on 8 January 2014.

On 7 July 1998, Eurocopter EC120 B s/n 1006 was registered G-BXYD in the UK with McAlpine Helicopters at Oxford Airport, the Eurocopter dealer in the UK. On 30 September 1998, the G-BXYD was registered with John Finlay (Concrete Pipes) in Dungannon, Northern Ireland. On 8 November 1999, the G-BXYD was transferred to Finlay Block Making Equipment, Dungannon. On 14 November 2000, the G-BXYD was registered with Jetmac in Lanark, Scottland. On 16 December 2002, the EC120 B G-BXYD was transferred to Helimac, Lanark. On 19 January 2004, the G-BXYD was registered with Aero Maintenance in Pontefract. On 28 November 2011, in service with Aero Maintenance, the G-BYXB was re-registered G-OMEM. On 7 June 2013, EC120 B G-OMEM was registered with BC Helicopter Services, Manchester. On 7 January 2016, SD Helicopters at St. Helens became the next registered owner of the G-OMEM. On 7 January 2017, EC120 B G-OMEM was registered with Go Exclusive as owner and Kingmoor Aviation as holder. On 19 July 2019, the G-OMEM was registered with OMEM in Milan, Italy. On 21 December 2020, registration G-OMEM was cancelled as exported to the Netherlands. On 12 February 2021, the EC120 B was registered PH-OMM with OMEM in Milan, Italy. On 27 February 2022, the helicopter was damaged beyond repair in an accident at Fino Mornasco, Como, Lombardy, Italy, On 4 November 2022, registration PH-OMM was cancelled as Written off/withdrawn fronm use.
On 23 April 2019, the 1998-built Eurocopter EC120 B G-OMEM was seen at the Heli-Holland heliport near Emmen, the Netherlands.

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