page_title: AgustaWestland AW101
section_title: Overview
hierarchical_section_title: AgustaWestland AW101 / Design / Overview
caption_attribution_description: EH101 Merlin drawing with view of Airframe Materials, now known as AgustaWestland AW101
context_page_description: The AgustaWestland AW101 is a medium-lift helicopter used in both military and civil applications. First flown in 1987, it was developed by a joint venture between Westland Helicopters in the United Kingdom and Agusta in Italy in response to national requirements for a modern naval utility helicopter. Several operators, including the armed forces of Britain, Denmark, and Portugal, use the name Merlin for their AW101 aircraft. It is manufactured at factories in Yeovil, England and Vergiate, Italy; licensed assembly work has also taken place in Japan and the United States.
  Prior to 2007, the aircraft had been marketed under the designation EH101. The original designation was, in fact, EHI 01, from the name given to the Anglo-Italian joint venture – European Helicopter Industries – but a transcription error changed this to EH101 and the designation stuck. In 2000, Westland Helicopters and Agusta merged to form AgustaWestland, leading to the type's current designation.
context_section_description: The AW101 Merlin follows a conventional design layout, but makes use of advanced technologies, such as the design of the rotor blades, avionics systems, and extensive use of composite materials. The fuselage structure is modular and incorporates an aluminium-lithium alloy, designed to be both light and damage-resistant. The AW101 is designed for operating in extreme weather conditions; it is fitted with a de-icing system and rated to operate in temperatures ranging between −45 and +50 °C. The aircraft's control systems allow the AW101 to maintain a stable hover in 74 km/h (40 kn) crosswinds.
  An active vibration control system, known as the active control of structural response system, reduces airframe vibration by up to 80% which increases crew comfort and minimises stress on the airframe. The cockpit is fitted with armoured seats for the crew, and can withstand an impact velocity of over 10 m/s. Dual flight controls are provided, though the AW101 can be flown by a single person. The pilots' instrument displays include six full-colour high-definition screens and an optional mission display; a digital map or forward looking infrared (FLIR) display can also be installed.
caption: AW101 airframe diagram
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