Aeroplane Aerodynamics and Navigation
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Questions and Answers

What is the primary function of a direct-reading magnetic compass?

  • To show the direction in which an aircraft is heading with respect to the Earth's magnetic meridian (correct)
  • To show the direction of the magnetic equator
  • To measure the angle of magnetic inclination
  • To detect the magnetic poles

    • At what location on the Earth's surface are the lines of force horizontal to the surface?

  • At the geographic equator
  • At the magnetic poles
  • At the North Pole
  • At the magnetic equator (correct)

    • What is the angle of magnetic inclination at the magnetic poles?

  • 90 degrees (correct)
  • 0 degrees
  • 180 degrees
  • 45 degrees

    • What emerges vertically at the north magnetic pole?

    <p>The lines of force</p> Signup and view all the answers

    What type of compass incorporates both the magnetic sensing element and display element in one component?

    <p>A direct-reading compass</p> Signup and view all the answers

    Why is it important for the pilot to correct for variation when navigating?

    <p>To take variation into account</p> Signup and view all the answers

    What is a desirable property of a liquid used in a compass?

    <p>Low freezing point</p> Signup and view all the answers

    What is the purpose of a flexible element in a liquid-filled compass?

    <p>To compensate for changes in the liquid's volume due to temperature changes</p> Signup and view all the answers

    What happens to the liquid in a compass when it is subjected to low temperatures?

    <p>It contracts and decreases in volume</p> Signup and view all the answers

    What can cause a compass to become unserviceable?

    <p>External leaks or air bubbles</p> Signup and view all the answers

    Why is low power lighting used in compass illumination?

    <p>To prevent interference with the compass's accuracy</p> Signup and view all the answers

    What type of cable is often used to supply power to a compass's illumination?

    <p>Screened cable or a twisted pair</p> Signup and view all the answers

    What is the primary cause of deviation in an aircraft's magnetic compass?

    <p>Local magnetic fields in the aircraft</p> Signup and view all the answers

    What is the purpose of the compass compensation phase in the calibration procedure?

    <p>To adjust the compass to obtain minimum residual deviation error</p> Signup and view all the answers

    What is the result of the compass calibration process?

    <p>A compass correction card</p> Signup and view all the answers

    What can affect the Earth's magnetic field in an aircraft?

    <p>Components fitted to an aircraft that contain iron</p> Signup and view all the answers

    When can deviation error be minimised?

    <p>During compass calibration</p> Signup and view all the answers

    What is the purpose of the compass correction card?

    <p>To correct for deviation errors during flight</p> Signup and view all the answers

    What is the primary factor affecting compass accuracy on north-south headings?

    <p>Coefficient C error</p> Signup and view all the answers

    Where are the compensator magnets located?

    <p>In the longitudinal axis</p> Signup and view all the answers

    What is the purpose of the compass calibration proforma?

    <p>To simplify the compensation process</p> Signup and view all the answers

    When is the compass compensation and adjustment procedure performed?

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

    What is the result of not correcting for coefficient C error?

    <p>Inaccurate compass readings on north-south headings</p> Signup and view all the answers

    What is the final step in the compass compensation process?

    <p>Recording the calibration on a compass calibration card</p> Signup and view all the answers

    What is the main purpose of rotating the compass or flux valve in relation to Coefficient A?

    <p>To correct for installation error and read the correct heading</p> Signup and view all the answers

    When does the magnetism in the fuselage affect compass accuracy the most?

    <p>When the aircraft is heading east or west</p> Signup and view all the answers

    What is the purpose of the compensator magnets located in the lateral axis of the aircraft?

    <p>To correct for Coefficient B error</p> Signup and view all the answers

    What is Coefficient C error primarily caused by?

    <p>An imaginary magnet lying along the aircraft's lateral axis</p> Signup and view all the answers

    Why does the fuselage magnetism not modify the magnetic meridian when the aircraft is heading north or south?

    <p>Because the Earth's lines of flux travel north-south</p> Signup and view all the answers

    What is the orientation of the imaginary magnet that causes Coefficient B error?

    <p>Along the fore and aft axis of the aircraft fuselage</p> Signup and view all the answers

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