Aeroplane Aerodynamics and Navigation
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Questions and Answers

Where do the lines of force emerge from in a magnet?

  • At the equator
  • At the north magnetic pole (correct)
  • At the center of the magnet
  • At the south magnetic pole

    • What is the angle of the magnetic lines of force at the magnetic equator?

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

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

  • To show the direction in which an aircraft is heading (correct)
  • To indicate the aircraft's magnetic inclination
  • To show the aircraft's altitude
  • To measure the aircraft's speed

    • At which location do the magnetic lines of force make an angle of 90 degrees with the Earth's surface?

    <p>Magnetic poles</p> Signup and view all the answers

    What does the pilot need to correct for when navigating?

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

    What is the device that incorporates both the magnetic sensing element and display element in one component?

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

    What is the primary purpose of compass compensation in an aircraft?

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

    What is the primary cause of deviation error 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 correction card in an aircraft?

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

    What is the effect of magnetisable components on the Earth's magnetic field?

    <p>They distort the magnetic field</p> Signup and view all the answers

    What is the primary advantage of minimizing the magnetic field produced by current flow in the wire?

    <p>It reduces the deviation error</p> Signup and view all the answers

    When is the deviation error measured during the compass calibration procedure?

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

    What is the purpose of graduating a compass card in 5- or 10-degree increments?

    <p>To provide more accurate readings</p> Signup and view all the answers

    What is the function of the lubber line in a compass?

    <p>To provide a reference point for the compass card</p> Signup and view all the answers

    Why is the magnet system assembly mounted pendulously?

    <p>To align the magnet with the horizontal component of the lines of force</p> Signup and view all the answers

    What happens to the dip angle in aircraft compasses between latitudes 60° north and south?

    <p>It remains constant at 3 degrees</p> Signup and view all the answers

    What happens to a direct-reading compass counterbalanced for use in higher latitudes of the northern hemisphere when used in Southern Australian states?

    <p>It becomes virtually unreadable</p> Signup and view all the answers

    Why is it normal practice to counterbalance the compass magnet system for the region in which it will be operated?

    <p>To enable the compass to be used in different regions</p> Signup and view all the answers

    Where are flux valves typically positioned in an aircraft?

    <p>In the wingtips or top of the tailfin</p> Signup and view all the answers

    Why is it important to use non-magnetic materials for flux valve mounting screws and nearby panels?

    <p>To minimize the effects of local magnetism</p> Signup and view all the answers

    What is the purpose of having two flux valves in some aircraft?

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

    What type of gyro is commonly used in remote compass systems?

    <p>Electrically driven directional gyro</p> Signup and view all the answers

    What is the function of a flux valve in an aircraft?

    <p>To sense magnetic heading information</p> Signup and view all the answers

    Where do the amplified magnetic heading signals from the flux valve get distributed to?

    <p>All aircraft systems dependent on magnetic heading information</p> Signup and view all the answers

    Why does the compass card need to be pendulous?

    <p>To minimize the effects of magnetic dip</p> Signup and view all the answers

    What happens to the pendulous card during aircraft manoeuvres?

    <p>It is displaced from the vertical due to aircraft acceleration</p> Signup and view all the answers

    What is the effect of aircraft acceleration on the magnet system?

    <p>It causes the magnet system to rotate to align with the Earth's magnetic field</p> Signup and view all the answers

    What is the benefit of a pendulous compass card?

    <p>Ability to operate at higher latitudes without excessive tilt</p> Signup and view all the answers

    What is the cause of in-flight errors in compass readings?

    <p>Aircraft acceleration during flight</p> Signup and view all the answers

    What is the relationship between the pendulous card and the vertical component of the Earth's magnetic field?

    <p>The pendulous card is influenced by the vertical component</p> Signup and view all the answers

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