What are hydraulic packing seals used for in a landing gear shock strut?

Hydraulic packing seals in a landing gear shock strut are specifically designed to work with a particular type of hydraulic fluid. These seals are crucial in maintaining the appropriate pressure and fluid integrity within the strut, which ensures effective damping and shock absorption during landing and takeoff.

The design and material of hydraulic packing seals are tailored to the chemical properties and characteristics of the hydraulic fluid used in the system. Using a specific type of fluid helps to ensure compatibility with the seals, avoiding degradation that could lead to leaks and reduced performance.

Additionally, while moisture accumulation and other environmental factors are important considerations in the overall design of hydraulic systems, packing seals are not primarily intended to address moisture issues or used solely for testing purposes. Their main function centers on ensuring a reliable seal that maintains hydraulic pressure and prevents fluid leakage, thus directly contributing to the effectiveness and reliability of the landing gear system.