Aerial saw

The aerial saw is not used only to make new paths for transmission or power lines, but also for maintaining the paths initially cut by the aerial saws. The aerial saw is suspended from a helicopter able to support the swinging weight of the saw. Once the saw is attached to the helicopter, it is turned on and precisely piloted alongside potentially troublesome tree branches. Normally, more than one pass by the branches is needed to ensure adequate coverage.[4] The branches are then picked up by a ground crew and disposed of properly.

The design of the aerial saw is fairly simple. It involves ten two-foot diameter circular saw blades (normally seen in Table saws) mounted on a vertical shaft which is around twenty feet long. Those ten circular saw blades are driven by a 28 horsepower engine. The engine is able to run all ten blades at speeds up to four-thousand revolutions per minute (RPM). The shaft is then attached to a ninety-foot aluminum boom (or beam) then attached to the helicopter where the pilot can remotely control the saw.[4]

The aerial saw is inherently dangerous due to its construction and size. This danger allows for the quick removal of tree branches that are a potential hazard. This danger is kept in line with very strict protocols and precautions. In order for one of these saws to be used in a residential area, a safety buffer must be in place prior to work. The operation must be monitored and certified by the Federal Aviation Administration (FAA) for each business to use. This certification, as well as the required insurance coverage, is earned only through safe operation of the power saw.[5]

Prior to 1983, the side trimming of trees for electric utilities was done by climbing crews or workers armed with mechanical trimmers. In 1983 Randall Rogers of Pea Ridge Arkansas flew the first Helicopter Aerial Saw. Following Randall Rogers death, Aerial Solutions Inc. (ASI) purchased the Aerial Saw patent. They then pioneered the use of helicopters for side trimming of paths for more than 20 utility, pipeline companies, and governmental agencies throughout the United States.[6] American Electric Power (AEP) began using the aerial saw to clear out paths for transmission lines in 1986. These transmission lines were first established in Virginia, West Virginia, Kentucky and Tennessee, where the terrain is known to be very mountainous and difficult to access with hand power tools.