Electro-Hydraulic Actuator in Aerospace Engineering

What is the function of the on/off solenoid valve in the electro-hydraulic actuator?

To position the spool valve assembly
To control the fluid flow to the transfer valve
To engage the servo after satisfying interlocks and fault-detecting monitors (correct)
To record the position of the control surface actuator piston

What is the purpose of the transfer valve in the electro-hydraulic actuator?

To respond to an electrical signal and direct hydraulic fluid to the autopilot actuator (correct)
To position the spool valve assembly
To relieve excess pressure in the system
To regulate the hydraulic fluid flow to the control surface actuator

What is the role of the autopilot actuator in the electro-hydraulic actuator?

To control the on/off solenoid valve
To regulate the fluid flow to the control surface actuator
To monitor the system's performance
To position the control surface actuating cylinder (correct)

What is the function of the LVDTs in the electro-hydraulic actuator?

To record the positions of the autopilot actuator and the control surface actuator piston (C) Signup and view all the answers

What is the condition for the on/off solenoid valve to engage?

After a series of interlocks and fault-detecting monitors are satisfied (A) Signup and view all the answers

What is the purpose of the return relief valve in the electro-hydraulic actuator?

To relieve excess pressure in the system (D) Signup and view all the answers

What is the primary function of the autothrottle system in an aircraft?

To control the aircraft's speed and airspeed during all flight stages (D) Signup and view all the answers

How does the autothrottle system operate on aircraft with engines fitted with digital fuel control?

Through a thrust management computer that programs the power setting of each engine (A) Signup and view all the answers

What is the purpose of the autothrottle engage interlocks?

To ensure the autopilot is engaged before the autothrottle can be selected (C) Signup and view all the answers

When can the autothrottle be selected on an aircraft?

When the autopilot is controlling the vertical path of the aircraft (A) Signup and view all the answers

What is the function of the servo motor in the autothrottle system on aircraft with mechanical fuel control?

To position the thrust levers collectively (C) Signup and view all the answers

What indication is provided when the autothrottle is engaged?

A green light on the autopilot mode select panel (D) Signup and view all the answers

What is the primary function of trim tabs in an aircraft?

To relieve the pilot of continuously maintaining a force on the control column or rudder pedals (A) Signup and view all the answers

What is the main reason for incorporating power assistance in larger aircraft?

Because it is physically impossible to move the control surfaces by muscles alone (B) Signup and view all the answers

How do hydraulically powered actuators operate?

From mechanical input (A) Signup and view all the answers

What is the primary difference between power-assisted and power-operated control systems?

The way the pilot's control stick is connected to the control surface (A) Signup and view all the answers

What is the result of displacing the control column or rudder pedals?

The aircraft's attitude changes (D) Signup and view all the answers

What is the purpose of the control lever in a power-assisted control system?

To connect the pilot's control stick to the control surface (A) Signup and view all the answers

What happens when the spoiler of one wing is raised?

The wing drops due to the loss of lift (A) Signup and view all the answers

What is the primary function of the elevators on an aircraft?

To control the pitch of the aircraft (A) Signup and view all the answers

What happens when the pilot pushes the control column forward?

The aircraft dives (B) Signup and view all the answers

What is the primary function of the rudder on an aircraft?

To control the direction of the aircraft (A) Signup and view all the answers

In manually operated flight controls, what provides the power to move the control surfaces?

The muscles in the pilot's arms and legs (C) Signup and view all the answers

How are the control surfaces connected to the control column in manually operated flight controls?

By cables (C) Signup and view all the answers

How many independent autopilot systems can an aircraft have?

One, two, or three (D) Signup and view all the answers

What is the minimum number of autopilots required for an Autoland capable aircraft?

Two (A) Signup and view all the answers

What happens when a single input failure occurs in a Fail Passive autopilot installation?

The aircraft defaults to a stable condition (D) Signup and view all the answers

What is the purpose of additional rack-mounted units in an autopilot system?

To control the autopilot's logic and monitor its operation (B) Signup and view all the answers

How do the computer units of each autopilot system receive inputs?

Dedicated inputs (B) Signup and view all the answers

What is a characteristic of a Fail Passive autopilot installation?

A warning is provided and the aircraft defaults to a stable condition (D) Signup and view all the answers