Gulfstream G650ER Elevator Hydraulic Actuation Manual Description

The PSV connects hydraulic system pressure to the EHSV (Electro-Hydraulic Servo Valve) and connects the EHSV extend and retract control ports to the ram via the MSV (Manifold Solenoid Valve).

In the EBHA electrical backup state, the starting, stopping and reversing of the electrical pump motor modulates the flow of fluid to provide the desired actuator movement.

The MSV controls entry into the damped bypass state.

<p>In the energized position, the MSV allows hydraulic flow during either normal or electrical backup state.</p> Signup and view all the answers

<p>Electrical backup control of a surface is only done if both the EHSA (Electro-Hydraulic Servo Actuator) and EBHA systems do not function in their normal hydraulic state.</p> Signup and view all the answers

<p>No, there will not be mixed operation where an EHSA is operated in its normal hydraulic state and the EBHA is in electrical backup state.</p> Signup and view all the answers

<p>The warm up state circulates warm hydraulic fluid through the manifold and prevents it from becoming cold soaked. This ensures the EBHA is ready to immediately control the surface in case the EHSA fails.</p> Signup and view all the answers

<p>In the EBHA electrical backup state, backup power provides closed-loop positional control of the EBHA, using the pump motor.</p> Signup and view all the answers

<p>An LVDT (Linear Variable Differential Transformer) is likely used for position sensing in the system.</p> Signup and view all the answers

<p>The two main hydraulic actuator systems mentioned are the EHSA (Electro-Hydraulic Servo Actuator) and the EBHA (Electrical Backup Hydraulic Actuator).</p> Signup and view all the answers