Aeroplane Aerodynamics and Navigation
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Questions and Answers

Why is a compass filled with a liquid?

  • To reduce the effects of friction and wear
  • To make it aperiodic (correct)
  • To increase the weight on the pivot
  • To amplify the dip angle

    • What is the purpose of a damping device in a compass?

  • To amplify the dip angle
  • To make the magnet system dead beat or aperiodic (correct)
  • To reduce the effects of friction and wear
  • To increase the oscillation of the magnet system

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

  • Corrosive properties
  • High viscosity
  • Low freezing point (correct)
  • High reactivity

    • What is the effect of the movement of the magnet system and its spider in the liquid?

    <p>It sets up small eddies that are quickly dissipated</p> Signup and view all the answers

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

    <p>To accommodate changes in the liquid's volume</p> Signup and view all the answers

    What is the benefit of the liquid in a compass in terms of the weight on the pivot?

    <p>It reduces the weight on the pivot</p> Signup and view all the answers

    What type of liquids are normally used in compasses?

    <p>Mineral or alcohol</p> Signup and view all the answers

    What can cause a compass to become unserviceable?

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

    Why is it important to check a new compass from overseas before use on Australian aircraft?

    <p>To ensure it is calibrated for operation in southern latitudes</p> Signup and view all the answers

    Why is low power lighting used in a compass?

    <p>To reduce the effect of magnetic fields</p> Signup and view all the answers

    What is used to supply power to the compass's illumination?

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

    What is the purpose of compass illumination?

    <p>To make the compass useable for night-flying or flying in low light situations</p> Signup and view all the answers

    What is the effect of the Earth's magnetic field on the voltage induced in each secondary coil?

    <p>modifies the voltage induced</p> Signup and view all the answers

    What is the purpose of the collector horns in the flux valve?

    <p>To concentrate the magnetic field</p> Signup and view all the answers

    What is the output of the flux valve indicative of?

    <p>The aircraft's heading</p> Signup and view all the answers

    What is the characteristic of the voltage induced in each secondary coil when the flux valve is not exposed to an external magnetic field?

    <p>Equal in each secondary coil</p> Signup and view all the answers

    What is the purpose of the primary winding in the flux valve?

    <p>To induce an equal voltage in each secondary coil</p> Signup and view all the answers

    What determines the direction and intensity of the magnetic field through each leg of the flux valve?

    <p>The angular relationship of the flux detector to the Earth's magnetic field</p> Signup and view all the answers

    What type of error is corrected by rotating the compass or flux valve until the compass reads the corrected heading?

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

    When does the magnetism in the fuselage have no effect on compass accuracy?

    <p>On north-south headings</p> Signup and view all the answers

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

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

    What is the direction of the imaginary magnet lying along the fore and aft axis of the aircraft fuselage?

    <p>Fore and aft axis</p> Signup and view all the answers

    When does the lateral magnetism modify the magnetic meridian?

    <p>Never, it only strengthens or weakens it</p> Signup and view all the answers

    What is the main reason why Coefficient B error affects compass accuracy on east-west headings?

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

    What is the purpose of comparing the datum compass reading with the aircraft compass?

    <p>To record the aircraft's magnetic heading and any deviation</p> Signup and view all the answers

    Why should non-magnetic tools be used when performing maintenance on direct-reading compasses?

    <p>To prevent magnetic interference from the tools</p> Signup and view all the answers

    What type of cables should be used to connect the compass light to reduce magnetic interference?

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

    What is the purpose of swinging an aircraft compass?

    <p>To calibrate the compass in an area free from unusual magnetic influences</p> Signup and view all the answers

    What type of materials should be used for panels and screws in the vicinity of direct-reading compasses and flux valves?

    <p>Non-ferrous materials</p> Signup and view all the answers

    Why should direct-reading compasses or flux valves not be exposed to magnetic fields?

    <p>To prevent the compass from veering significantly</p> Signup and view all the answers

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