The original model was the A109. This was followed very quickly by the A109A. This production version had a higher takeoff gross weight and some other improvements. The 109A was succeeded by the 109A Mark II. This version is essentially the same as the 109A, except for the installation of a higher rated main transmission. In addition, an improved engine was made optional to enhance single-engine performance. Partway through the production run of the Mark II, the width of the cabin was increased by about 5 inches through the installation of bulged doors and restyling of the sides of the fuselage. This model was followed in 1989 by the 109C. This model made the optional C20R engine standard and has a higher takeoff gross weight.
The Agusta 109 is an eight-place helicopter that was designed in response to a need from the marketplace for a 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 top the other on one side of the cabin. In this configuration, there is also room for two medical attendants.
The Agusta 109C drivetrain uses two Rolls-Royce 250-C20R1 engines, a four-bladed, fully articulated rotor and a two-bladed tail rotor. The main rotor blades are made of composites. The tail rotor blades are made of aluminum, as is the fuselage. The A109C uses a retractable landing gear.
The design of the original Agusta 109 was launched in the mid-1960s. Development of the A109C was started in 1987. The first flight of the Agusta 109C took place in 1988 and certification to the standards of FAR 27 with IFR approval was obtained in 1989. The 109C was in production from 1989 until 1996. During this time, over 100 were delivered.
