Aircraft Flight Control Systems: Actuators and Servomotors
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Questions and Answers

What happens to the outside wing when an airplane yaws?

  • It becomes less swept back in relation to the air flow (correct)
  • It stalls
  • It maintains its original angle to the air flow
  • It becomes more swept back in relation to the air flow

    • What is the purpose of a yaw damper control system?

  • To control the roll of the airplane
  • To provide artificial feel to the pilot
  • To increase the airspeed of the airplane
  • To automatically control the yawing of the airplane (correct)

    • What is the primary difference between the autopilot engage switch and a flight controller?

  • One has a CWS mode, while the other does not (correct)
  • One has a Heading Hold mode, while the other does not
  • One is used for manual flight, while the other is used for automatic flight
  • One is used for turbine aeroplanes, while the other is used for other types of aircraft

    • In a hydraulically operated control surface actuator, what does the pilot need to move to input a command?

    <p>The control valve spool</p> Signup and view all the answers

    What is the purpose of the Heading Select mode?

    <p>To respond to the angular difference between the aircraft's heading and a preselected heading</p> Signup and view all the answers

    Why is an artificial feel unit necessary in a hydraulically operated control surface?

    <p>To replicate the opposition forces of a mechanically driven control surface</p> Signup and view all the answers

    What are the three main types of servomotors?

    <p>Electro-pneumatic, Electro-mechanical, Electro-hydraulic</p> Signup and view all the answers

    What is the primary difference between a hydraulically operated control surface and a mechanically operated one?

    <p>The amount of force required to deflect the control surface</p> Signup and view all the answers

    What will the aircraft do if the Altitude Select mode is engaged while climbing or descending?

    <p>It will level off at the selected altitude</p> Signup and view all the answers

    What type of actuator is most likely to be used in modern commercial aircraft?

    <p>Electro-hydraulic</p> Signup and view all the answers

    What is the purpose of the system shown in the diagram?

    <p>To provide elevator feel</p> Signup and view all the answers

    How many pneumatic actuators are needed for each control surface?

    <p>Two</p> Signup and view all the answers

    What is the purpose of the Vertical Speed Hold mode?

    <p>To maintain the aircraft's current vertical speed</p> Signup and view all the answers

    What is the purpose of a bridle cable in a pneumatic actuator?

    <p>To reposition the flight control surface</p> Signup and view all the answers

    What is the effect of engaging the Airspeed or Mach Hold mode?

    <p>The aircraft will change its pitch attitude to maintain its current airspeed</p> Signup and view all the answers

    What is the relationship between the Vertical Speed Hold mode and the Altitude Hold mode?

    <p>They are mutually exclusive</p> Signup and view all the answers

    What is the difference between a series and a parallel actuator?

    <p>Pilot's control movement</p> Signup and view all the answers

    What is the source of pneumatic pressure in an electro-pneumatic actuator?

    <p>Both A and B</p> Signup and view all the answers

    What is the primary function of the control surface position cam?

    <p>To increase the spring pressure on the yellow valve</p> Signup and view all the answers

    What is the purpose of an autopilot system?

    <p>To provide pilot relief during tedious stages of flight</p> Signup and view all the answers

    What is the term for an autopilot system that controls attitude about the roll axis only?

    <p>Wings leveller</p> Signup and view all the answers

    What is the term for an autopilot system that can land an aircraft automatically?

    <p>Autoland</p> Signup and view all the answers

    How many axes of control can a multi-axis autopilot system implement?

    <p>Two or three axes</p> Signup and view all the answers

    What is the term for the system that incorporates autopilot functions, among others?

    <p>AFCS</p> Signup and view all the answers

    What is the function of the control wheel steering transducer in an autopilot system?

    <p>To convert the input force into an electrical signal</p> Signup and view all the answers

    What is the primary difference between the command mode and control wheel steering mode in autopilot systems?

    <p>The pilot does not touch the controls in command mode, but does in control wheel steering mode</p> Signup and view all the answers

    How can a pilot override the autopilot system in case of a malfunction?

    <p>By applying a reasonable amount of pressure on the respective flight control</p> Signup and view all the answers

    What is the purpose of the autopilot system's design allowing pilot override?

    <p>To allow the pilot to instinctively correct malfunctions</p> Signup and view all the answers

    What type of sensing device can be used as a control wheel steering transducer?

    <p>All of the above</p> Signup and view all the answers

    What is the control wheel steering mode of autopilot operation?

    <p>A mode where the pilot provides input signals to the flight control computer</p> Signup and view all the answers

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