The original model was the A109. The first production version was the A109A, which was succeeded by the 109A Mark II and the A109C. In addition, the A109K2 was introduced to provide outstanding hot and high performance. Each model incorporated various improvements, including a higher rated main transmission, an improved engine, increased cabin size, increased fuel capacity and a higher takeoff gross weight. The A109 Power represents a major redesign of the A109. This redesign provides increased cabin length and width, higher fuel capacity, a redesigned retractable gear, a redesigned main rotor, a higher rated transmission and new engines. This model is also referred to as the A109E.
The Agusta 109 Power is an eight-place light twin-engine turbine helicopter. The cabin has two compartments and the pilot compartment has two seats. The passenger cabin has five or six seats in two facing rows. Alternatively, two litters can be loaded through the side doors and placed one on each side of the cabin. In this configuration, there is also room for two medical attendants.
The Agusta 109 Power drivetrain uses two Pratt & Whitney Canada PW 206C engines with FADEC, a four-bladed, fully articulated rotor and a two-bladed tail rotor. It is also available with Turbomeca Arriel engines. The main rotor blades are made of composites. The tail rotor blades are made of aluminum, as is the fuselage.
The design of the original Agusta 109 was launched in the mid-1960s. Development of the A109 Power was started in 1983. The first flight of the Agusta 109 Power prototype took place in 1995. Certification to the standards of FAR 27 with IFR approval was obtained in 1996 and first deliveries started the same year.