本航空航天推荐规程（ARP）的范围涵盖了在航空航天飞行器上对液压系统流体进行微粒污染测量的地点、时间和频率。由于液压设备可靠性至关重要，液压油颗粒污染的测量是航空航天界关注的问题。污染总是存在于系统流体中，甚至在新的未使用的流体中也是如此。污染必须低于不会对系统运行产生不利影响的水平。该ARP借鉴了航空航天工业的经验和实践，为航空航天飞行器液压系统中的流体污染取样建议建立了标准。然后可以对流体样品进行颗粒污染物和其他有害污染物如氯化溶剂和水的测量。

The scope of this Aerospace Recommended Practice (ARP) covers where, when, and how often to sample hydraulic system fluid on aerospace vehicles for particulate contamination measurements. The measurement of hydraulic fluid particulate contamination is of concern to the aerospace community because of the critical importance of hydraulic equipment reliability. Contamination is always present in the system fluid, even in new unused fluid. Contamination must be below a level that will not adversely affect system operation. This ARP draws from aerospace industry experience and practice to establish criteria for fluid contamination sampling recommendations in aerospace vehicle hydraulic systems. Fluid samples can then be subjected to measurement of particulate contamination and of other harmful contaminants such as chlorinated solvents and water.