N1US is made by AgustaWestland, and was built near Milan, Italy. The model name, Grand, and model number, 109S, designate that it is a civilian-type aircraft. The Grand is only one version of the extensive and diverse line of AgustaWestland aircraft which serve private, commercial, government, and military operations.
The 109S is a twin-engine helicopter, designed for commercial and private aviation use. N1US is serial number 40 of the Grand line, outfitted with the factory-standard two-pilot cockpit and five passenger executive configuration. The helicopter has all standard factory avionics and has not been retrofitted for adventure or long-distance missions.