Definition of Columbia helicopters

Columbia Helicopters, Incorporated, or CHI, is an aircraft manufacturing and operator company based in Aurora, Oregon, United States. They are known for operating tandem rotor helicopters; primarily the Boeing Vertol 107 and Boeing 234. These helicopters are used in Heli-Logging, oil exploration, fire suppression, construction and many other activities. In addition the company operates a large FAA Repair Station supporting customers around the world.