Final answer:
To start an aircraft engine with a float carburetor, the carburetor heat control should be in the cold position to avoid an excessively rich fuel mixture and potential engine flooding.
Step-by-step explanation:
When starting an aircraft engine equipped with a float carburetor, the carburetor heat control should typically be placed in the cold position. This is because using carburetor heat when the engine is cold can lead to the introduction of warm, less dense air which can enrich the fuel mixture excessively, potentially causing a flooded engine condition. Once the engine is running and the risk of icing is evaluated, carburetor heat may be applied as needed according to the conditions and the aircraft's operating procedures.
When starting an aircraft engine equipped with a float carburetor, the carburetor heat control should be placed in the full cold position. This is done to prevent any ice that may have formed within the carburetor from entering the engine, which could lead to engine failure.
By placing the carburetor heat control in the full cold position, the pilot ensures that the hot exhaust gases are directed into the carburetor, melting any ice and preventing its entry into the engine.
After starting the engine, the carburetor heat control should gradually be moved to a warmer position as the engine warms up and the risk of ice formation decreases.