What are two common methods used to anti-ice turbine engine inlet ducts?

What are two common methods used to anti-ice turbine engine inlet ducts?

• A. Engine bleed air and electric heating
• B. Fuel heating and windchill
• C. Water mist and cooling
• D. Hydraulic cooling and cooling

Answer: (A)

Inlet anti-ice works by applying heat to prevent ice from forming on the duct surfaces. The two common methods are using hot bleed air drawn from the engine to warm the inlet ducts and using electric heating elements to provide direct, controllable heat to the surfaces. Bleed-air anti-icing takes advantage of the engine’s own high-temperature air, distributing it around the inlet and spinner to keep icing at bay without needing an extra power source. Electric heating offers precise control and is useful where bleed air isn’t available or where extra warm-up capability is needed. The other options don’t fit because windchill isn’t a heat source, water mist isn’t a standard method for anti-icing in inlet ducts, and hydraulic or general cooling would remove heat rather than provide it.

Inlet anti-ice works by applying heat to prevent ice from forming on the duct surfaces. The two common methods are using hot bleed air drawn from the engine to warm the inlet ducts and using electric heating elements to provide direct, controllable heat to the surfaces. Bleed-air anti-icing takes advantage of the engine’s own high-temperature air, distributing it around the inlet and spinner to keep icing at bay without needing an extra power source. Electric heating offers precise control and is useful where bleed air isn’t available or where extra warm-up capability is needed. The other options don’t fit because windchill isn’t a heat source, water mist isn’t a standard method for anti-icing in inlet ducts, and hydraulic or general cooling would remove heat rather than provide it.