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SAE ARP988 Revision B, May 1, 2016
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(R) Electrohydraulic Mechanical Feedback Servoactuators
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AIA/NAS Aerospace Standards
This recommended practice is intended as a guide for the specification of electrohydraulic mechanical feedback servoactuators used for position control. It provides performance definitions and capabilities that are specific to mechanicalfeedback servoactuators and different from those applicable to electrical-feedback servoactuators.

Field of Application

The recommendations contained herein are confined to the input and output characteristics of electrohydraulic mechanical feedback servoactuators. It does not cover hydro-mechanical feedback servoactuators which do not require electrohydraulic servovalves for operation. The information presented should be useful for standardizing the terminology and for specification of physical and performance parameters.

The recommendations do not restrict nor attempt to define the internal design characteristics of servoactuators. As such, the material is equally applicable to servoactuators having different internal functioning, different ratings, different physical size, etc. In certain instances, standards for actuator design are recommended to increase interchangeability as, for example, pigtail color-coding and actuator polarity.

The requirement recommendations contained herein should be adequate to describe electrohydraulic mechanical feedback servoactuators used for position control. Additional requirements may be necessary to define special requirements for specific control systems. Certain dynamic compensation methods will be discussed.