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Aircraft Spoiler System EHSA Manifold Quiz

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Aircraft Spoiler System EHSA Manifold Quiz

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Questions and Answers

What are the two independent data buses that the REU receives surface position commands from?

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

What are the two hydraulic components that the REU initiates electrical commands to?

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

Which hydraulic system is the spoiler pair connected to?

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

What type of position sensing information does the hydraulic actuator provide to the REU?

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

What are the three states of operation for the EHSA?

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

In the active hydraulic state, what does the REU do to the MSV?

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. Signup and view all the answers

What does the active position of the MSV do?

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

What are the two requirements for the active hydraulic state of the EHSA?

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

What is the purpose of the EHSV in the actuator system?

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

What is the purpose of the hydraulic actuators in the system?

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