Which fluid is commonly used in aviation hydraulic systems?

• A. Skydrol
• B. Engine Oil
• C. Water
• D. Gear Oil

Answer: (A)

Skydrol is the fluid commonly used in aviation hydraulic systems due to its specific properties that make it ideal for aviation applications. It is a phosphate ester-based hydraulic fluid that exhibits excellent thermal stability and resistance to fire, which is critical in the high-temperature environments often encountered in aircraft. Skydrol is also non-flammable, which enhances safety, and it has good lubricating properties, ensuring smooth operation of hydraulic components.

Additionally, Skydrol fluids are designed to operate effectively under a wide range of temperatures and pressures, making them suitable for the demanding conditions of flight operations. The fluid also has the capability to resist the formation of any water or bacteria, further enhancing system reliability and performance. These characteristics collectively make Skydrol the preferred choice for hydraulic systems in aviation, providing safety and efficiency for various hydraulic functions within the aircraft.