The original model was the AW109. The first production version was the AW109A, which was succeeded by the AW109A Mark II and the AW109C. In addition, the AW109K2 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 AW109 Power and its stretched derivative, the AW109 Grand represent a major redesign of the AW109. 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. The AW109 Grand is also referred to as the AW109S.
The AW109 Grand was introduced in 2004. The Grand is a stretched derivative of the AW109 Power. It is fitted with two Pratt and Whitney 207C turboshaft engines and a choice between two avionics packages: Rockwell Collins Pro Line II or the BendixKing Silver Crown suite. The cockpit can be fitted with night vision goggles (NVG) compatible internal and external lighting. Certification was received in 2006 and the helicopter is in production.
AgustaWestland introduced the AW109 GrandNew at HAI Heli-Expo in March 2011. This update features a new digital glass cockpit and a composite fuselage. Synthetic vision capabilities, and a four-axis autopilot, enhance situational awareness.
The AW109 Trekker was introduced at HAI Heli-Expo in 2014. It is based on the AW109 Grand New and has skids instead of wheels. Itcomes equipped with a Garmin 1000HTM avionics suite.