AgustaWestland's wider business strategy, under which it aims to produce a standardised family of helicopters with common design features. The sharing of components and design philosophies is intended to simplify maintenance and training for operators; commonality also lowers the production costs. The AW139 was the first of this group, and as of 2014, it was to be joined by the larger AW149 and AW189, aimed at military and civilian customers respectively. Advances made in the development of new models are intended to be transferable onto existing family members, decreasing the cost of future upgrades for the AW139.Head, Elan. "Upward Trend." Vertical, 22 January 2014. In June 2010, it was announced that AgustaWestland and Rostvertol would build a manufacturing plant in Tomilino, Moscow Region, where it was initially planned to produce AW139s by 2012. HeliVert, a joint venture between AgustaWestland and Rostvertol, commenced domestic production of the AW139 in 2012, at which point it was planned that between 15 and 20 helicopters would be produced per year. The first AW139 to be assembled in Russia made its first flight in December 2012. In January 2013, the Russian Defense Ministry was reportedly considering placing an order for seven AW139s. In January 2014, HeliVert received a Certificate of Approval from the Aviation Register of the Interstate Aviation Committee to commence production of commercial AW139s. In September 2014, a certificate was granted to perform comprehensive maintenance and servicing of the type at the Tomilino facility. During 2015, AgustaWestland unveiled an AW139 model with an increased gross weight of seven tonnes, enabling a range of 305 km while carrying 12 passengers; existing AW139s can also be rebuilt to the newer heavy-weight model. This heavier airframe comes at the expense of decreased hot and high performance. In November 2015, AgustaWestland demonstrated a 60-minute "run-dry" test (no oil) of an AW139's main gearbox, 30 minutes greater than any other certified rotorcraft at the time. Design The AW139 is a conventional twin-engine multi-role helicopter. It has a five-bladed fully articulated main rotor with a titanium hub and composite blades and a four-bladed articulated tail rotor. It is fitted with retractable tricycle landing gear, the two aft wheels retracting into external sponsons which are also used to house emergency equipment. It is flown by a crew of two pilots, with up to 15 passengers accommodated in three rows of five. The AW139 had been aimed at a vacant niche