本SAE航空航天推荐规程（ARP）规定了通过膜过滤和显微镜计数对液压油样品中的颗粒污染物（5微米或更大）进行分级和计数的材料、仪器和程序。它能够计算从流体动力系统中提取的样品中的颗粒物，这些样品由SAE as 4059或NAS 1638的12个等级确定，并在规定的五个标准范围内超出这些等级，因此可以作为确定可接受性的主要文件。它还能够揭示但不测量水、其他液体、细颗粒和其他材料（尤其是纤维和金属）异常量的证据。适用于所有军用、民用、航天器和测试设备。

This SAE Aerospace Recommended Practice (ARP) defines the materials, apparatus and procedure for sizing and counting of particulate contamination, five micrometers or greater, in hydraulic fluid samples by membrane filtration iwth microscopic counting.It is capable of counting particulate matter in samples withdrawn from fluid power systems as identified by the 12 classes of SAE AS 4059 or NAS 1638 and projected beyond these for the five standard ranges specified and can thus serve as the primary document to determine acceptability.It is also capable of revealing but not measuring evidence of abnormal amount of water, other fluids, fine particulate and other materials, especially fibers and metals.It is applicable to all military, civil, space vehicles and test equipment.