航空推进驱动系统的润滑剂性能能力来源于油的物理财产和与油的化学财产相关的性能属性。粘度、压力粘度系数和全膜牵引系数等物理财产是润滑液的固有财产。化学特性对于在表面上形成保护性边界润滑膜以防止磨损和擦伤至关重要。这些属性也与表面引发的疲劳（微定位）相关。为了确保性能并为工程设计提供所需的信息，正在研究至少五种油品财产的方法:（1）压力粘度系数，（2）全膜牵引系数，（3）抗擦伤性，（4）耐磨性，和（5）微点倾向。压力粘度系数可以直接通过使用高压设备评估粘度作为压力的函数来测量，或者通过在光学干涉仪中测量膜厚度来间接测量。 本文件（ARP6157）描述了通过测量流体膜厚度计算压力粘度系数的以下两种替代测试仪器:i。PCS EHD2测试仪器ii。WAM试验机两种方法均显示出相似的结果，因此两种方法均可用于计算样本润滑剂的压力粘度系数。有关如何设置和运行任一方法的详细信息，请参阅第7节（PCS-EHD）或第8节（WAM）。

The lubricant performance capability for aero propulsion drive systems is derived from the physical properties of the oil and performance attributes associated with the chemical properties of the oil. Physical properties, such as viscosity, pressure viscosity coefficient and full-film traction coefficient are inherent properties of the lubricating fluid. Chemical attributes are critical for the formation of protective boundary lubricating films on the surfaces to prevent wear and scuffing. These attributes are also associated with surface initiated fatigue (micropitting). To assure performance and to provide required information for engineering design, methodology for at least five oil properties are being studied: (1) pressure-viscosity coefficient, (2) full-film traction coefficient, (3) scuffing resistance, (4) wear resistance, and (5) micropitting propensity. The pressure-viscosity coefficient can be measured either directly by assessing viscosity as a function of pressure using high pressure apparatus, or indirectly by measuring film thickness in an optical interferometer. This document (ARP6157) describes the following two alternative test instruments for calculating the pressure viscosity coefficient by measuring the fluid film thickness:i. PCS EHD2 test instrumentii. WAM test machineBoth methods have been shown to give similar results, therefore either method can be used to calculate the pressure viscosity coefficient of a sample lubricant. For details of how to set up and run either method, see Section 7 (PCS-EHD) or Section 8 (WAM).