Which statement about cooling the engine oil is true?

Which statement about cooling the engine oil is true?

• A. A fuel/oil heat exchanger is used
• B. A water-cooled radiator is used
• C. Oil cooling is done in the exhaust system
• D. An air-cooled finned cooler is used

Answer: (A)

The engine oil is cooled by a fuel/oil heat exchanger. Hot oil from the engine passes through this exchanger where it transfers heat to the circulating fuel. The oil is cooled and returns to the engine, while the fuel becomes warmer and continues on to the fuel system. Using fuel as the cooling medium keeps the system compact and takes advantage of the existing fuel loop, avoiding a separate cooling radiator. This is why that statement is the true one. The Beechjet 400A does not rely on a dedicated water radiator for oil cooling, oil cooling in the exhaust, or an air-cooled finned cooler as the primary method.

The engine oil is cooled by a fuel/oil heat exchanger. Hot oil from the engine passes through this exchanger where it transfers heat to the circulating fuel. The oil is cooled and returns to the engine, while the fuel becomes warmer and continues on to the fuel system. Using fuel as the cooling medium keeps the system compact and takes advantage of the existing fuel loop, avoiding a separate cooling radiator. This is why that statement is the true one. The Beechjet 400A does not rely on a dedicated water radiator for oil cooling, oil cooling in the exhaust, or an air-cooled finned cooler as the primary method.