Carburettor Icing

Ice can form in the carburettor.

Ice can form when the ambient air is warm, and if there is sufficient moisture present.

Can lead to loss of engine power and lead to engine failure.

Refrigeration Ice

What is it?  

Ice forming in the carburettor.

How does it happen?

Pressure drops - Temperature drops - Moisture in the air condenses and freezes - blocking the venturi - cutting off fuel/air supply - stopping the engine.

When can it happen?

Air temperature at 25ºC or below and relative humidity above 50%.

Prevention? 

Apply carb heat to the carburettor via a control in the cockpit.