How does the oleo strut absorb touchdown energy?

• A. It vents hydraulic fluid to the atmosphere.
• B. It stores fuel.
• C. It compresses hydraulic oil and gas to absorb energy.
• D. It provides steering.

Answer: (C)

When the wheel touches down, the oleo strut acts as a hydraulic spring-damper. The impact energy is absorbed by compressing the nitrogen gas charge inside the strut while hydraulic oil is forced through a calibrated orifice or valve, providing damping as it flows. The gas stores energy as it compresses and then releases it gradually, while the oil flow controls the rate of compression to smooth the landing. Venting hydraulic fluid to the atmosphere would remove the damping and energy-absorbing action, storing fuel is unrelated to landing impact, and providing steering is a separate function not responsible for absorbing touchdown energy.