Which statement describes a method to prevent icing in turbine engine fuel systems?

• A. A heat exchanger using bleed air or engine oil
• B. A larger fuel filter
• C. An auxiliary electric pump
• D. A turbocharger

Answer: (A)

Icing in turbine engine fuel systems occurs when any water in the fuel freezes in lines or filters at low temperatures, potentially blocking flow. A heat exchanger that uses bleed air from the engine or heat from the engine oil warms the fuel before it reaches the metering and filtration stages. By raising the fuel temperature, it prevents water from crystallizing and keeps the fuel at a viscosity that allows pumps and injectors to operate smoothly, reducing the risk of ice-related blockages.

The other options don’t stop ice formation: a larger fuel filter might delay a blockage but won’t prevent ice from forming; an auxiliary electric pump helps maintain flow but doesn’t address icing; a turbocharger has no role in heating the fuel. Hence, heating the fuel with a heat exchanger is the effective method to prevent icing.