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This ARP is intended to be a guide for determining pressure drop in fluid systems such as hydraulic, fuel, oil, and coolant used in aerospace vehicles. Determining pressure drop by analytical and test methods will be discussed.

This SAE Aerospace Information Report (AIR) provides details of how to perform hydraulic system calculations using equations that incorporate the metric International System of Units (SI).

This SAE Aerospace Recommended Practice (ARP) provides the technical terms and nomenclature, together with their definitions and abbreviations/acronyms that are used in aerospace fluid power, actuation and control systems. NOTE: ARP490 and ARP4493 are sources for definitions specifically for electrohydraulic servovalves.