Air Patrols. Air patrols are used only when there is a need to check out the pipeline quickly. They are
also used in areas where foot and motor patrols are difficult or impossible to use because of the rough
terrain. This is especially true in mountainous areas. Air patrols require fewer persons to patrol more
pipeline than do foot and motor patrols. However, air patrols may be limited because of bad weather. Air
patrols report all problems by radio so that repair crews can be sent to work on the pipeline.