本文件描述了起落架减震器中使用的液压流体，这些流体具有极高的接触压力和抗磨添加剂，这些添加剂是为了改善润滑而添加的。

This document describes hydraulic fluids used in landing gear shock struts with extreme high contact pressure and anti-wear additives that have been added for improved lubrication.