30 Questions
What is the function of the on/off solenoid valve in the electro-hydraulic actuator?
To engage the servo after satisfying interlocks and fault-detecting monitors
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
What is the role of the autopilot actuator in the electro-hydraulic actuator?
To position the control surface actuating cylinder
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
What is the condition for the on/off solenoid valve to engage?
After a series of interlocks and fault-detecting monitors are satisfied
What is the purpose of the return relief valve in the electro-hydraulic actuator?
To relieve excess pressure in the system
What is the primary function of the autothrottle system in an aircraft?
To control the aircraft's speed and airspeed during all flight stages
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
What is the purpose of the autothrottle engage interlocks?
To ensure the autopilot is engaged before the autothrottle can be selected
When can the autothrottle be selected on an aircraft?
When the autopilot is controlling the vertical path of the aircraft
What is the function of the servo motor in the autothrottle system on aircraft with mechanical fuel control?
To position the thrust levers collectively
What indication is provided when the autothrottle is engaged?
A green light on the autopilot mode select panel
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
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
How do hydraulically powered actuators operate?
From mechanical input
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
What is the result of displacing the control column or rudder pedals?
The aircraft's attitude changes
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
What happens when the spoiler of one wing is raised?
The wing drops due to the loss of lift
What is the primary function of the elevators on an aircraft?
To control the pitch of the aircraft
What happens when the pilot pushes the control column forward?
The aircraft dives
What is the primary function of the rudder on an aircraft?
To control the direction of the aircraft
In manually operated flight controls, what provides the power to move the control surfaces?
The muscles in the pilot's arms and legs
How are the control surfaces connected to the control column in manually operated flight controls?
By cables
How many independent autopilot systems can an aircraft have?
One, two, or three
What is the minimum number of autopilots required for an Autoland capable aircraft?
Two
What happens when a single input failure occurs in a Fail Passive autopilot installation?
The aircraft defaults to a stable condition
What is the purpose of additional rack-mounted units in an autopilot system?
To control the autopilot's logic and monitor its operation
How do the computer units of each autopilot system receive inputs?
Dedicated inputs
What is a characteristic of a Fail Passive autopilot installation?
A warning is provided and the aircraft defaults to a stable condition
This quiz covers the components and functions of an electro-hydraulic actuator, commonly used in aerospace engineering, particularly in aeroplane systems. Learn about the solenoid valve, pressure line, return line, transfer valve, and other essential parts. Test your knowledge of this critical system!
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