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SAE ARP4255 Revision A, March 1, 2012
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Electrical Actuation Systems for Aerospace and Other Applications
Includes all amendments and changes through Stabilization Notice (No longer revised / updated) , March 2012
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AIA/NAS Aerospace Standards
This Aerospace Recommended Practice (ARP) is intended as a guide in the preparation of Procurement Specifications for electrical actuator systems to be sued in aerospace and other applications. Detail requirements, as necessary to completely define a specific actuator, are the responsibility of the procuring agency.


An electrical actuation systems (EAS) is defined as consisting of all electrical, mechanical, optical, or fluidic components necessary to convert a command signal and electrical power from the vehicle into a controlled linear or rotary force while using an electromagnetic prime mover. For purposes of this document, the following definitions of an EAS apply.

ELECTROMECHANICAL ACUATOR: An electromechanically actuator is defined as an EAS that utilizes an electric motor mechanically coupled to the load.

ELECTROHYDRAULIC ACTUATOR: An electro hydraulic actuator is defined as a self-contained EAS that utilizes an electric motor driving a hydraulic pump to operate a hydraulic actuation system.