本SAE航空航天推荐规程(ARP)提供了有关腔设计、在这些腔中安装弹性体型备用密封件以及与典型减震器液压油或润滑脂接触后弹性体材料特性的信息的建议。该ARP主要涉及在减震器上使用备用密封件，其中在任何时候仅安装一个动态密封件并与滑块/减震器活塞接触。 这些减震器通常具有位于下密封件托架的外径上的备用(动态)密封压盖。该备用密封压盖旨在容纳备用弹性体接触密封件。分离式聚四氟乙烯（PTFE）备用环也可以安装在备用密封腔中。 在操作过程中，如果安装的动态减震器标准密封开始失效/泄漏，则可以将飞机顶起，允许减震器的下部压盖螺母落下。当前使用的动态密封件可以自由切割，并且备用弹性体密封件可以在密封件承载环上拉伸到动态密封位置。减震器可以重新组装，然后起落架准备好在这个相对简单的过程之后在新的密封就位的情况下继续操作。

This SAE Aerospace Recommended Practice (ARP) provides recommendations on cavity design, the installation of elastomer type spare seals in these cavities, and information surrounding elastomer material properties after contact with typical shock absorber hydraulic fluid(s) or grease. This ARP is primarily concerned with the use of spare seals on shock absorbers where only a single dynamic seal is fitted and in contact with the slider/shock absorber piston at any one time. These shock absorbers typically have a spare (dynamic) seal gland located on the outer diameter of the lower seal carrier. This spare seal gland is intended to house a spare elastomer contact seal. Split Polytetrafluoroethylene (PTFE) backup rings can also be installed in the spare seal cavity. During operation, if the fitted dynamic shock absorber standard seal begins to fail/leak, then the aircraft can be jacked up, allowing the lower gland nut of the shock absorber to be dropped down. The current used dynamic seal can be cut free, and the spare elastomer seal can be stretched over the seal carrier ring into the dynamic seal position. The shock absorber can be re-assembled and then the landing gear is ready to continue operation with a new seal in position after this relatively simple procedure.