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Guardian Avionics 451-201 Information The Guardian Avionics 451-201 is a remote mounted carbon monoxide (CO) detector designed for FAA certified Part 23 aircraft and Part 27 and 29 rotorcraft. It is a compact and lightweight unit that is meant to use as little cockpit space as possible, while still providing highly accurate CO detection. Introduction Carbon monoxide is a colorless, odorless, and tasteless gas that can be deadly. It is produced by the incomplete combustion of fuels, such as gasoline, propane, and diesel. In an aircraft, CO can be produced by a variety of sources, including engine exhaust, malfunctioning appliances, and even the pilot's own breathing.