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This SAE Aerospace Information Report (AIR) is to present to hydraulic system designers the salient factors that affect hydraulic piston pump life and performance. It is noted that this document differs in scope from ARP819. ARP819 is a composite checklist of the many variables that affect the pump selection for a particular application.

This specification establishes the common requirements and provides a guide for special requirements for variable delivery hydraulic pumps, suitable for use in civil aircraft. It also specifies the methods to be used for demonstrating compliance with these requirements.

Missile pumps are categorized by a moderate testing life and a relatively short operational service life. Generally, the pumps are operated at higher speeds, temperatures, and pressures than those used in manned aircraft systems, yet reliability must be extremely high, since there rarely is a redundant system aboard the missile.

This document will be limited in scope to power transfer units made up of two fixed displacement pumps/motors.

This specification establishes the common requirements for variable delivery, hydraulic pumps, suitable for use in aircraft; and the methods to be used for demonstrating compliance with these requirements.