Gulfstream G650ER Elevator Hydraulic Actuation Manual Description

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What is the purpose of the PSV (Pressure Solenoid Valve) in the system?

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).

How is actuator movement controlled in the EBHA (Electrical Backup Hydraulic Actuator) electrical backup state?

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.

What is the function of the MSV (Manifold Solenoid Valve)?

The MSV controls entry into the damped bypass state.

When is the MSV in the energized position?

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

Under what conditions is electrical backup control of a surface performed?

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. Signup and view all the answers

Is mixed operation between EHSA and EBHA allowed? Explain.

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. Signup and view all the answers

What is the purpose of the warm up state in the EBHA system?

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. Signup and view all the answers

How is positional control achieved in the EBHA electrical backup state?

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

What component is likely used for position sensing in the system?

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

What are the two main hydraulic actuator systems mentioned?

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

PSV Purpose

Connects hydraulic pressure to EHSV and control ports to ram via MSV.

EBHA Control (Electrical Backup)

Electrical pump motor modulates fluid flow for actuator movement.