Diagram of a float-type carburetor showing components: fuel/air mixture routing to combustion chambers, float chamber maintaining fuel level, fuel inlet, throttle valve controlling airflow, venturi creating low pressure, discharge nozzle ejecting fuel, air bleed mixing air with fuel, and mixture needle adjusting fuel flow.

Carburetor Ice

The first sign of carburetor ice may be rough engine running. Aircraft equipped with a fixed pitch propeller will show a loss of RPM and those with a constant speed propeller will show a drop in manifold pressure.