PA.IX.C.K1b refers to which icing condition?

• A. Carburetor or induction icing.
• B. Wing icing.
• C. Pitot tube icing.
• D. Engine oil icing.

Answer: (A)

Carburetor or induction icing is the icing condition being described. It happens when moist air flowing through the carburetor cools and ice forms in the venturi or around the throttle, restricting or blocking the air–fuel flow into the engine. This leads to rough engine operation, a drop in power, and possibly engine failure if the ice thickens. You’ll typically see this in humid air at temperatures near freezing, and it’s often treated by applying carburetor heat to melt the ice and restore airflow.

Wing icing is a surface issue that disrupts lift and increases stall speed, not an engine intake problem. Pitot tube icing affects airspeed (and other instruments relying on the pitot system). Engine oil icing isn’t a standard category of icing in this context. So the carburetor or induction icing answer best matches PA.IX.C.K1b.