Local backup hydraulic actuator for aircraft control systems

Power plants – Pressure fluid source and motor – Apparatus having means responsive to or ameliorating the...

Reexamination Certificate

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Reexamination Certificate

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07870726

ABSTRACT:
A backup system is provided that has a local electric motor and pump for some or all of hydraulic actuators. A local backup hydraulic actuator has two power sources, hydraulic as primary and electrical as backup. During normal operation, the hydraulic actuator receives pressurized fluid from a hydraulic system and the fluid flow to the chambers is controlled by a servo valve. If the hydraulic system fails, the electronic controller detects the failure by observing the signal indicative of the pressure from the pressure sensor, and the controller powers the local hydraulic pump to provide high pressure hydraulic fluid to the hydraulic actuator via the servo valve.

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