Editing Eurocopter EC135 (section)

==Design==
[[File:Christoph2-cockpit.jpg|thumb|The cockpit of an EC135, May 2008]]

The H135 is a twin-engine rotorcraft. It can be alternatively powered by a pair of [[Turbomeca Arrius]] 2B or [[Pratt & Whitney Canada PW206B]] engines, dependent on customer's preference, which gives either a T or a P, respectively, in the variant name.<ref name="Benenson"/><ref name="pope"/> The main rotor is of a four-bladed, [[Helicopter rotor#Rigid|hingeless]] fiber-composite design. Progressive improvements to the main rotor have increased its performance and reduced maintenance costs since the type's introduction.<ref name="engineer 2014" /> The EC135 is the quietest helicopter in its class, featuring an anti-[[resonance]] isolation system to dampen vibration from the main rotor.<ref name="ben 89" /> The type's Fenestron anti-torque device can be actively regulated via a HI NR rotor optimization mode, which provides for greater controllability during higher weight take-off and landings.<ref name="pope" /> It is capable of performing Category A operations throughout its full flight envelope.<ref name="civil broch">[http://www.airbushelicopters.com/website/docs_wsw/RUB_30/tile_2644/H135-BR-0515E.pdf "Civil: H135"]. ''Airbus Helicopters'', Retrieved: 16 November 2015.</ref>

The EC135 can be equipped with either a conventional flight deck or the Avionique Novelle [[glass cockpit]] – the latter allows for single pilot [[instrument flight rules]] operation.<ref name="ben 89-90"/> The glass cockpit is equipped with several [[liquid-crystal display]]s, including two Sextant SMD45 displays and a central panel display.<ref name="pope" /> The main avionics suite is supplied by [[Thales Group]]. The EC135 can be outfitted with various avionics suites from manufacturers such as Russian firm Transas Aviation and British firm Britannia 2000.<ref>[http://www.forceindia.net/IndustrySepnews29.aspx "Eurocopter shows the capability of its helicopters at MAKS 2011"]. {{webarchive|url=https://web.archive.org/web/20150924014523/http://www.forceindia.net/IndustrySepnews29.aspx |date=24 September 2015}} ''Force'', September 2012.</ref><ref>[http://www.shephardmedia.com/news/rotorhub/camc-selected-npas-ec135-mission-system/ "CAMC selected as NPAS EC135 mission system"]. ''Shepard Media'', 17 November 2014.</ref>

The newer H135 model can be equipped with a four-axis autopilot, which is included as part of the Helionix avionics suite. This suite provides the H135 with a greater level of commonality with several other Airbus Helicopters-produced rotorcraft, including the H145, [[Airbus Helicopters H160|H160]] and [[Airbus Helicopters H175|H175]].<ref>Perry, Dominic. [https://www.flightglobal.com/news/articles/h135-gains-helionix-avionics-suite-417467/ "H135 gains Helionix avionics suite"]. ''Flight International'', 7 October 2015.</ref> Earlier versions of the EC135 were equipped with a three-axis autopilot with integrated stability augmentation,<ref name="pope" /> featuring a First Limit Indicator (FLI), simplifying engine and torque monitoring.<ref name="ben 89-90" /> Cockpit [[touch screen]]s can be optionally installed.<ref name="civil broch" />

[[File:Eurocopter EC 135 P2.jpg|thumb|An EC135 of the German [[Landespolizei|Brandenburg State Police]]]]

Various cabin and cockpit configurations are available for the EC135, depending on the role performed and the operator's preferences. It can hold up to five passengers and a pilot when configured with a standard executive interior, or seven passengers in a dense corporate interior.<ref name="pope"/> [[Modularity|Modular]] multi-role interiors that allow the main cabin area to be quickly changed and re-equipped are available.<ref name="civil broch"/><ref name="ben 89-90">Benenson 2004. pp. 89–90.</ref> The main cabin of the EC135 is accessed either by large doors on either side of the cabin or by clamshell doors located at the rear of the cabin, directly underneath the aircraft's tail boom. The clamshell doors are particularly attractive to emergency medical services (EMS) and cargo operators.<ref name="ben 89-91">Benenson 2004. pp. 89, 91.</ref>

Medical facilities can be installed in the cabin, such as in-flight [[intensive care]] stations (including [[resuscitation]] functionality), [[Neonatal intensive care unit#Incubator|incubator]]s, and hygiene-convenient flooring.<ref name="civil broch"/> In a mountain rescue configuration, the cabin can simultaneously accommodate two stretchers as well as the pilot, anaesthetist, winch operator, mechanic and mountain rescue specialist.<ref name="engineer 2014"/>

Airbus Helicopters has promoted the airframe's various configurations as possessing "unique adaptability" for various missions, including utility work, commercial transportation, and training roles.<ref name="civil broch"/> Equipment for the [[law enforcement]] role include external [[loudspeaker]]s, [[rappel]]ling system, search lights with [[laser pointer]]s, left or right-mounted [[hoist (device)|hoist]]s, and [[electro-optical sensor]]s. For offshore oil & gas operations, the rotorcraft can be fitted with [[weather radar|weather/search radar]]s, emergency floatation aids, including an automated external life raft, energy-absorbent seating, class-D certified external hoists, and crash-resistant [[Aircraft fuel tanks|fuel tanks]].<ref name="civil broch"/> An external hook can be installed to carry underslung loads of up to 272&nbsp;kg for cargo missions. In a training capacity, features such a light aircraft recording system for post-flight analysis, intuitive human-machine interface, specific training modules, and a one-engine inoperative training mode, and full ground simulators, may be selected.<ref name="civil broch"/>