scope:

This SAE Aerospace Standard (AS) establishes the general requirements for the design, construction, acceptance, and qualification testing of flat cut-off pressure compensated, variable delivery hydraulic pumps used in military aircraft hydraulic systems. It also provides parameters for a Procurement Specification to be used in conjunction with this AS.

The hydraulic pumps defined by this AS are generally for use in aircraft hydraulic systems conforming to and as defined in AS5440 and MIL-H-8891, as applicable.

NOTES:

1. Hydraulic pumps may incorporate features such as a clutch in the input drive, which will not be covered by this standard.

2. AS595 should be used for commercial aircraft hydraulic pumps.

3. This document should not be used for hydraulic pumps in Electro-Hydrostatic Actuator applications (EHAs).

Field of Application

The hydraulic pumps are intended for engine driven applications and use on aircraft for hydraulic operation of such mechanisms as:

• Powered flight control systems

• Landing gear

• Brakes

• Flaps

• Servoactuators

• Doors

The pumps are primarily intended to be driven by the airplane turbine engine and to supply fluid to systems in accordance with AS5440 or MIL-H-8891, as applicable. When driven by other means or used in uninhabited aircraft, additional tests and separate approval may be required by the contracting activity.