This SAE Aerospace Recommended Practice (ARP) establishes the factors which should be considered in the design and installation of a commercial transport rotorcraft hydraulic system, including the applicable airworthiness regulations that affect the hydraulic system.
This ARP also provides information and guidelines on the many factors that arise in the design process to provide cost effectiveness, reliability, maintainability and accepted design and installation practices.
The changes to ARP4925 at Revision B include: a. Technical changes to reflect the latest hydraulic system technologies. b. Editorial changes including updating the references and improving the readability of the document.