[2] The high ambient temperature at which it can occur often causes aircraft pilots to overlook the possibility of carb icing.
This may increase the venturi effect initially, but eventually restricts airflow, perhaps even causing a complete blockage of air to the carburetor.
Icing may also cause jamming of the mechanical parts of the carburetor, such as the throttle, typically a butterfly valve.
Aircraft powered by carbureted engines are equipped with carburetor heating systems to counter icing.
The inlet manifold and parts of the carburetor often have warm water from the cooling system or exhaust gas circulating through them to combat this problem.