The Helicopter Flight Rescue System (HFRS), also known as the Helicopter External Transport System (HETS), is a helicopter insertion and extraction tool which as under the Canadian Aviation Regulations (CARs) is authorized for use in Forest Fire Fighting, Law Enforcement, and Search and Rescue. The system is often referred to as "Long Line", "Short Haul", and other terms, and is similar to other helicopter long line systems in use throughout the world. A similar technique is used by linemen when constructing or maintaining power lines, and by maritime pilots between ship and shore.