AgustaWestland AW139 (AB139) multi mission helicopter

AgustaWestland AW139 (AB139) multi mission helicopter

The AW139 (formerly known as the AB139) is a medium twin-turbine helicopter, which was developed by Bell Agusta Aerospace, a joint venture of Bell Helicopter Textron of the US and AgustaWestland.
In November 2005, Bell announced that it was selling its stake in the AB139 programme to AgustaWestland. Following the sale, the helicopter was renamed AW139 in February 2006.
The AW139 is available in both civil and military configurations and is capable of carrying up to 15 passengers or 2,500kg (5,500lb) useful load. Civil applications include passenger transport, law enforcement, utility and offshore oil support. Other roles include search and rescue (SAR), cargo lift and firefighting.
As of June 2011, more than 500 AW139 helicopters have been delivered and more than 400 are in service in around 50 countries.
AW139 key players
A number of international companies are involved in the programme including Pratt & Whitney of Canada, Honeywell of the USA, PZL Swidnik of Poland, Liebherr of Germany, Kawasaki of Japan and others.
The AW139, along with the BA609, is built at Agusta’s Final Assembly Line in Vergiate plant, Italy. An AW139 assembly line has been built at the Agusta Aerospace Corporation plant in Philadelphia, Pennsylvania. The first AW139 built at the new facility was delivered in December 2006. A second assembly line was added in February 2008.
All parts and components for both lines come from the same sources and the aircraft is identical whether assembled in Italy or in the USA.
“The AW139 (formerly known as the AB139) is a medium twin-turbine helicopter.”
Development and certification
The first AW139 made its maiden flight in February 2001. Italian certification was granted in June 2003 and US certification in December 2004. The first AW139 helicopter was delivered to Elilario of Italy in March 2004 and the second to the government of Namibia in September 2004. The AW139 has been selected by more than 100 customers for more than 430 helicopters. The 200th AW139 helicopter was delivered in December 2008.
AgustaWestland has increased the maximum gross weight (MGW) of the AW139 to 6,800kg (14,991lb), a 400kg (882lb) increase on the current certified MGW of 6,400kg. The increased payload will make the AW139 more efficient for long-range offshore transport and search and rescue (SAR) operations. The increased MGW will be available on all new production aircraft as an option and as a retrofit. The AW139 with the weight increase is expected to achieve EASA certification by the end of 2008 with FAA certification soon after.
The AW139 is powered by two PT6C-67C turboshaft engines give maximum continuous power of 1,531hp.”
The AW139 helicopter had been selected by Integrated Coast Guard Systems (ICGS), a joint venture established by Lockheed Martin and Northrop Grumman, as part of their proposed aviation solution for the US coastguard deepwater programme. The AW139 would provide the VRS (VTOL recovery and surveillance aircraft) element and replace the HH-65 Jayhawk. The US coastguard has since decided to upgrade the HH-65 rather than procure new helicopters.
The US139 is being offered for the US Army’s light utility helicopter requirement. In February 2006 the helicopter was flown to the Cairns Army Airfield in Fort Rucker, Alabama for the LUH source selection performance demonstration (SSPD).
The AW139 military version is capable of carrying up to 15 troops or six stretchers with four medical attendants. It can be fitted with gun pods, rocket launchers and air-to-air missiles attached to two removable external supports.
In February 2011, AgustaWestland launched the AW139M, a customised military variant of the AW139. The AW139M features self protection equipment such as infrared detection, armoured seats to improve crew protection and blast resistant self-sealing fuel tanks.
AW139 design
A five-bladed fully-articulated main rotor with four-bladed canted tail rotor gives high tail rotor ground clearance, heavy duty nose-wheel tricycle landing gear is retractable for higher speed. Full crashworthy systems and seats are standard while an icing protection system is optional. Low noise signature, high-speed refuelling is possible from either side.
Two large ‘plug-in’ type sliding doors allow easy access to the cabin. The large baggage compartment (3.4m³) is accessible from the cabin and externally through large doors on both sides.
Cockpit
The AW139 has a Honeywell Primus Epic modular / integrated glass cockpit. The Primus Epic system is offered in four configurations: basic VFR (visual flight rules), IFR (instrument flight rules) three-axis automatic flight control system (AFCS), IFR four-axis digital AFCS and a search and rescue version.
“The AW1390 has a five-bladed fully-articulated main rotor with four-bladed canted tail rotor.”
The IFR versions have three or four Honeywell DU-1080 8in×10in active matrix liquid crystal displays. The Honeywell DU-1080 AMLCDs flat panel display provides advanced graphics generation capabilities and two cursor control devices (CCDs) provide additional control.
The system architecture is built on two modular avionics units (MAUs) that house the processing for most of the functions within the system. By integrating the functions into an MAU, powerful computer processing can be shared to do multiple tasks that previously required individual computer platforms.
The system features a powerful central maintenance computer function that will provide operators with a high level of troubleshooting and system maintenance support. Maintenance personnel may use the cockpit displays or a laptop computer to perform aircraft rigging, sensor calibration and avionics systems diagnostics.
Engines
The AW139 is powered by two Pratt & Whitney PT6C-67C turboshaft engines with full authority digital engine control (FADEC).
The engines have a maximum continuous power of 1,531hp (1142kw) each and give a maximum cruise speed of 290km/hr and a maximum range (without reserves) of 750km. Due to the power reserve of the engines, safe flight is ensured with one engine inoperative (OEI) at maximum take-off weight.
AW139 performance
The AW139 helicopter can climb at a rate of 10.9m/s. The maximum and cruise speeds of the helicopter are 310km/h and 306km/h respectively. The maximum range and service ceiling of the helicopter are 1,250km and 6,096m . The maximum endurance of the helicopter is five hours 56 minutes. The AW139 weighs around 3,622kg and the maximum take-off weight is 6,400kg.
The AW139 is a winning new generation medium twin-turbine helicopter which undeniably sets trends and new standards against which all medium twins are measured. Designed with inherent multi-role capability and flexibility of operation, the AW139 is capable of carrying up to 12 passengers not only at a very high speed but in a most spacious and comfortable cabin.
The ample baggage compartment is accessible both from the cabin and externally. The AW139 also impressively boasts the best power reserve of any helicopter in the medium twin-engine class. It fully complies with the latest stringent requirements in terms of performance and safety. Its Pratt & Whitney Canada PT6C-67C turbines, together with a state-of-the-art 5-bladed main rotor, deliver a high cruise speed even in demanding conditions at all weights.
The engines deliver an outstanding power to weight ratio, which allows Category “A” performance capabilities with no limitations in a wide range of operating conditions including ‘hot and high’. Leading edge technology includes a Honeywell Primus Epic fully integrated avionics system, a 4-axis digital AFCS and large flat panel colour displays in the cockpit. Full icing protection is available as an option. As a result of the new design approach the AW139 uses fewer components, benefits from integrated avionics and provides easy accessibility to all systems for simplified maintenance tasks.
The AW139 can be used for a wide range of applications including executive/VIP transport, EMS/SAR, offshore OGP support, fire fighting, law enforcement, paramilitary and military roles.

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