Aircraft Spoiler System EHSA Manifold Quiz

The REU receives surface position commands from the FCCs on two separate and independent bidirectional BD429 data buses.

The REU initiates electrical commands to the Mode Select Valve (MSV) solenoid and the Electro-Hydraulic Servo Valve (EHSV).

The spoiler pair is connected to the right hydraulic system and the left hydraulic system.

<p>The hydraulic actuators contains a single channel LVDT that provides position sensing information to the REU.</p> Signup and view all the answers

<p>The EHSA has the following three states of operation: Active hydraulic (normal), Hydraulic (upfloat) lock, and Powered retract.</p> Signup and view all the answers

<p>In the active hydraulic state, the REU energizes a normally open three-way MSV Solenoid Operated Valve (SOV) that moves the MSV into the active position.</p> Signup and view all the answers

<p>The active position of the MSV connects the cylinder ports to the EHSV.</p> Signup and view all the answers

<p>The active EHSA hydraulic state requires the aircraft hydraulic pressure supply to be available and the associated actuator REU to be functional.</p> Signup and view all the answers

<p>The EHSV controls the flow of hydraulic fluid that moves the actuator in the desired direction.</p> Signup and view all the answers

<p>The hydraulic actuators contain a single channel LVDT that provides position sensing information to the REU.</p> Signup and view all the answers