While it is rare for an aircraft to catch fire, accidents and equipment malfunctions can happen, making it important to always have a fire detection system in place. As such, nearly all aircraft are fitted with automatic smoke, flame, heat, and gas detectors, all of which keep a plane and its occupants safe. While these sensors are most crucial to have in the engine compartment, it is common to find them placed throughout the vessel. With this, knowing the different types that may be present on an aircraft can be helpful for crew and passengers alike.