How are hydraulic systems 1 and 2 cooled in flight?

How are hydraulic systems 1 and 2 cooled in flight?

• A. Ram Air in flight
• B. Cooler fans on the ground
• C. Air conditioning packs
• D. Heat exchanger with fuel

Answer: (A)

Hydraulic fluid is cooled through a heat exchanger that dumps heat to outside air. In flight, the aircraft’s forward motion provides ram air that flows through this cooler, carrying heat away from the hydraulic fluid. The system may use the cooler core and, at lower speeds, a fan to ensure sufficient airflow, keeping Systems 1 and 2 within safe temperatures. On the ground, cooling methods differ, but during flight the ram air effect is what removes heat from the hydraulic system.

Hydraulic fluid is cooled through a heat exchanger that dumps heat to outside air. In flight, the aircraft’s forward motion provides ram air that flows through this cooler, carrying heat away from the hydraulic fluid. The system may use the cooler core and, at lower speeds, a fan to ensure sufficient airflow, keeping Systems 1 and 2 within safe temperatures. On the ground, cooling methods differ, but during flight the ram air effect is what removes heat from the hydraulic system.