What is the primary function of a sleeve, spacer, or bumper ring in a landing gear oleo shock strut?

The primary function of a sleeve, spacer, or bumper ring in a landing gear oleo shock strut is to limit the extension stroke. This is crucial because it helps control the maximum amount the shock strut can extend, which is essential for maintaining the desired performance characteristics of the landing gear during landing and takeoff. Controlling the extension stroke ensures that the gear remains within operational limits and can absorb shock effectively, contributing to the overall safety and reliability of the aircraft.

In landing gear design, managing the extension stroke helps prevent excessive travel that could lead to structural damage or compromised handling characteristics. Therefore, using components like sleeves or spacers plays a vital role in ensuring that the oleo strut system functions as intended.