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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.

This document comprises the technical terms and nomenclature together with their definitions and abbreviations used in the field of aerospace fluid power, actuation, and control technologies. The terms listed herein, both general and specific, are believed to be most useful as a reference in the design of future aerospace vehicle fluid power, actuation, and control systems.

Metric (SI and CGS) and English units related to aerospace hydraulics are summarized. Conversion of units is provided as required. Fundamental fluid properties and physical laws governing fluid motion, pressure and other significant aspects are described in SI metric units. Examples of application to typical aerospace hydraulic system components are demonstrated.

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).

Metric (SI and CGS) and English units related to aerospace hydraulics are summarized. Conversion of units is provided as required. Fundamental fluid properties and physical laws governing fluid motion, pressure and other significant aspects are described in SI metric units. Examples of application to typical aerospace hydraulic system components are demonstrated.

This SAE Aerospace Information Report (AIR) contains technical information on aerospace hydraulic, actuation and support equipment technologies lessons learned. The lessons learned were prepared by system designers and hydraulic engineers from the aerospace industry and government services as part of SAE Committee A-6, Aerospace Fluid Power, Actuation, and Control Technologies, and were presented at eight Lessons Learned Symposia from 1989 through 1999 held during A-6 Committee meetings. The technical topics represent many years of design experience in hydraulics and actuation, which it is felt is a resource for learning that should be documented and made available to current and future aerospace hydraulic engineers and designers. The document is organized into two sections: systems and components with further categories within the components section.