Introduction to Magnetic Principles in Aviation
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Questions and Answers

What is the primary function of the magnetic compass in an aircraft?

  • To determine the altitude of the aircraft
  • To provide navigation aids during bad weather
  • To measure the airspeed of the aircraft
  • To display the direction in which the aircraft is heading in respect to the Earth's magnetic flux (correct)

    • What is the total magnetic force resolved into?

  • Only a horizontal component
  • A horizontal and a vertical component (correct)
  • Multiple magnetic forces
  • Only a vertical component

    • What is the role of the magnetic compass in aircraft with a remote indicating compass system and radio navigational aids?

  • To serve as the primary navigation system
  • To provide navigation data during instrument failure
  • To serve as a standby compass in case of primary navigation system failure (correct)
  • To provide backup navigation data

    • What aligns itself with the lines of flux linking the two magnetic poles of the Earth?

    <p>A freely suspended permanent magnet</p> Signup and view all the answers

    What is the Earth's magnetic field?

    <p>A weak magnetic field that surrounds the Earth</p> Signup and view all the answers

    What is the purpose of the magnetic compass in most light aircraft?

    <p>To serve as the primary heading reference</p> Signup and view all the answers

    What is the primary cause of the pendulous card's centre of gravity swinging outward and rotating during a turn?

    <p>Force of centrifugal acceleration</p> Signup and view all the answers

    In which hemisphere is the error generated a mirror image of that produced in the other hemisphere?

    <p>Southern hemisphere</p> Signup and view all the answers

    What is the direction of the turning error when an aircraft is turning from a northerly heading?

    <p>Depends on the hemisphere</p> Signup and view all the answers

    Why does the pendulous card remain vertical to the plane of the aircraft during a coordinated turn?

    <p>Because the card pivot point is carried along with the aircraft</p> Signup and view all the answers

    What is the factor that determines the extent of the turning error?

    <p>Magnetic angle of dip</p> Signup and view all the answers

    What is the result of the magnet system being tilted during a turn?

    <p>The card's magnet system is free to rotate under the influence of the vertical component of the Earth's magnetic field</p> Signup and view all the answers

    What is the principle behind the output of the flux valve?

    <p>AC synchro output</p> Signup and view all the answers

    Why is it essential to position flux valves carefully?

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

    What type of mounting screws should be used for the flux valve?

    <p>Non-magnetic screws</p> Signup and view all the answers

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

    <p>To provide redundancy in the system</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 purpose of the directional gyro in the remote compass system?

    <p>To provide short-term stability of magnetic heading presentation</p> Signup and view all the answers

    What should be avoided in the vicinity of a direct reading compass during a calibration or compensation process?

    <p>Ferrous material</p> Signup and view all the answers

    Why is it important to leave the spanner in the same position during the calibration process?

    <p>Because the system is only compensated while the spanner remains in place</p> Signup and view all the answers

    What is the recommended distance of the datum compass from the aircraft?

    <p>50 metres</p> Signup and view all the answers

    Why is it essential to use non-magnetic tools for adjusting the correctors?

    <p>To maintain the accuracy of the compass reading</p> Signup and view all the answers

    What should be done with the engine during the final check of the compass swing?

    <p>The engine should be running</p> Signup and view all the answers

    Where should compass swings be performed, according to established regulations?

    <p>At a surveyed compass swing site</p> Signup and view all the answers

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

    <p>To determine the deviation of the aircraft compass</p> Signup and view all the answers

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

    <p>To prevent magnetic interference with the compass</p> Signup and view all the answers

    What type of cable should be used to connect electrical leads to a compass to reduce magnetic interference?

    <p>Twisted pair cable</p> Signup and view all the answers

    What is the importance of avoiding exposure of direct-reading compasses to magnetic fields?

    <p>To prevent magnetic interference with the compass</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?

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

    What is the requirement for an area where an aircraft compass needs to be swung?

    <p>It should be free from unusual magnetic influences other than those derived from the aircraft</p> Signup and view all the answers

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