Parker Aerospace designs and manufactures electrohydrostatic actuation (EHA) systems that eliminate the need for central hydraulic systems. EHA systems are power-by-wire actuation systems that utilize aircraft electric power for flight control surface actuation. These systems are highly energy efficient and provide an overall weight benefit to the aircraft. EHA technology is power-on-demand actuation that results in reduced overall aircraft power consumption. EHAs result in improved maintainability since there are no hydraulic connections between actuation equipment and the vehicle system.

EHAs consist of a fixed displacement, high speed, reversible pump driven by a brushless DC electric motor. Actuator position is controlled by the pump rotation direction and actuator piston velocity is controlled by pump rotational speed. The actuator output force is a function of the electric motor output torque.

Our EHA designs are dual tandem and simplex hydraulic output and contain fail-safe features, overload protection, and optimized packaging to reduce weight. Parker EHAs and are known throughout the industry for providing reliable performance within customer specifications.

Parkers EHA technology represents three decades of research, development, and flight-tested reliability. EHAs are the sole means of flight control actuation on the F-35 Fighter aircraft and are fully qualified and in production.

Parker is self-sufficient in all technologies involved in EHAs
• Systems and actuation
• EHA pumps and motors
• Power and control electronics

APPLICATIONS:
EHAs can be used anywhere traditional hydraulic actuation is needed. Today EHAs are used on:
• Military fighters
• Commercial transport aircraft
• Military transport aircraft
Potential EHA applications include landing gear, nose wheel steering, and utility actuation

FEATURES AND ATTRIBUTES:
Our EHAs offer significant advantages such as:
• Dual or single hydraulic output
• Fault tolerant and fail-safe designs
o Fail centering
o Single system bypass
o Trail damping
• Integrated brushless DC motor/pump design for optimum performance and efficiency
• Maintenance-free reservoir:
o Provides positive pump inlet pressure under all temperature conditions
o Fluid volume sufficient for no scheduled maintenance
o Prevents cavitation during fail-safe mode
o Reservoir fluid level indication
• Cylinder pressure transducers
• Overload protection
• Latest-technology materials provide high reliability at minimum weight
• Unique benefits:
o Custom fit to customer envelope
o Optimized size and weight
o Pedigree of flight-proven subcomponents
• Lower aircraft power consumption (power-on-demand)
• Reduced aircraft vulnerability – single failures will not disable multiple actuators
• Reduced life-cycle costs
• Reduced aircraft system weight
• Improved maintainability – no connection to a centralized hydraulic system