EC135 H135 An EC135T2 used by the of England & Wales Role Light National origin Germany Manufacturer First flight 15 February 1994 Introduction 1996 Status In service Produced 1995–present Number built 1300 (Jan. 2018) Developed from Variants The Eurocopter EC135 (now Airbus Helicopters H135) is a twin-engine civil light produced by (formerly known as Eurocopter). It is capable of flight under (IFR) and is outfitted with a digital automatic flight control system (AFCS). First flying on 15 February 1994, it entered service in 1996 and 1,300 have been delivered up to January 2018 to 300 operators in 60 countries, accumulating over 4.5 million flight hours. It is mainly used for helicopter then for corporate transport, law enforcement, offshore wind and military flight training. Half of them are in Europe and a quarter in North America, the is a military variant.

Contents • • • • • • • • • • • • • • Development [ ] Origins [ ] The EC135 started development prior to the formation of Eurocopter under (MBB) under the designation Bo 108 in the 1970s. MBB developed it in partnership with, the Bo 108 was initially intended to be a technology demonstrator, combining attributes of the successful with new advances and an aerodynamically streamlined design.

Technologies included on the Bo 108 included the first full-authority digital engine controls () on a helicopter, a hingeless main rotor, and the adoption of a new transmission. The first prototype made its first flight on 17 October 1988, powered by two /1 engines. A second Bo 108 followed on 5 June 1991, this time with two TM319-1B Arrius engines; unlike later production aircraft, both technology demonstrators flew with conventional tail rotors. Bo 108 prototype In the late 1990s, the design was revised with the introduction of the tail rotor system, an advanced rigid main rotor, composite materials, and resonance isolation systems. It was decided to pursue a full certification program, resulting in the production of two pre-production prototypes; at the same time, it was chosen to give the Bo 108 a new designation of EC135 to correspond with the newly created Eurocopter company. At this point, it was decided that the EC135 should be developed with the option of being powered by two competing engines, the 2B and the engines; two pre-production prototypes were built in 1994 powered by either engine, both powerplants proved to be successful and were used on subsequent production aircraft. In January 1995, the EC135 made its first public appearance at the Heli-Expo convention at, at which prospective buyers were reportedly impressed with its appearance and performance figures.

Another feature which became apparent upon entering service was the low noise levels produced, in part due to its fenestron tail, the EC135 was the quietest aircraft in its class for more than 15 years. Despite the helicopter's design being primarily oriented towards emergency medical operators, the EC135 had considerable appeal to a wide range of operators. European certification was achieved on 16 June 1996, with approval following on 31 July. On 2 December 1999, the EC135 was granted single-pilot IFR (SPIFR) certification by Germany's (LBA). In December 2000, the United Kingdom's also gave the EC135 SPIFR certification. Further development [ ].

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