Engine oil is cooled by means of which device?

Engine oil is cooled by means of which device?

• A. A fuel/oil heat exchanger
• B. An air-cooled radiator
• C. A water-cooled heat exchanger
• D. Oil cooler in the accessory section

Answer: (A)

Engine oil is cooled by a fuel/oil heat exchanger. In this setup, the engine oil is circulated through a heat exchanger that is thermally bonded to the aircraft’s fuel line. Heat from the hot oil is transferred to the fuel, cooling the oil and warming the fuel slightly. This uses the existing fuel system as the cooling medium, which is efficient and helps keep the oil within its required temperature range across different operating conditions. Using a fuel/oil heat exchanger avoids needing a separate air- or water-cooled oil cooler or a dedicated oil cooler located in the accessory section, which is why those other cooling methods aren’t used here.

Engine oil is cooled by a fuel/oil heat exchanger. In this setup, the engine oil is circulated through a heat exchanger that is thermally bonded to the aircraft’s fuel line. Heat from the hot oil is transferred to the fuel, cooling the oil and warming the fuel slightly. This uses the existing fuel system as the cooling medium, which is efficient and helps keep the oil within its required temperature range across different operating conditions.

Using a fuel/oil heat exchanger avoids needing a separate air- or water-cooled oil cooler or a dedicated oil cooler located in the accessory section, which is why those other cooling methods aren’t used here.