Final answer:
Anti-icing of turbine engine inlet ducts is typically achieved through heating elements like thermawing or chemical treatments that lower the freezing point of water.
Step-by-step explanation:
The most common methods used for anti-icing turbine engine inlet ducts involve heating elements and fluid systems. One such system is Thermawing, which is a reliable anti-icing and deicing system designed for smaller single-engine aircraft that provides heated wing technology similar to those found on larger jet-powered aircraft.
The method employed by Thermawing can be understood as an electrical heating system that works by using high-output alternators to generate the necessary electric power, which prevents ice from forming on the aircraft's inlet ducts. Additionally, freezing point depression is another principle utilized in anti-icing, where chemicals are applied to the surfaces of the aircraft to lower the freezing point of water, which prevents the buildup of ice.