Turbine Aeroplane: Aerodynamics, Structures and Systems - Compass Types
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Questions and Answers

What is the primary function of a direct reading compass on a light aircraft?

  • To measure aerodynamic properties
  • To provide navigation during instrument failure
  • To serve as a standby compass
  • To act as the primary heading reference (correct)

    • What type of metal is used in the magnet system of a direct reading compass?

  • Copper
  • Stainless steel
  • Cobalt-steel (correct)
  • Aluminum

    • What is the purpose of the iridium-tipped pivot in the suspension of a direct reading compass?

  • To attach the compass card to the magnet system
  • To provide a stable platform for the magnet system
  • To reduce pivot friction to a minimum (correct)
  • To increase pivot friction

    • What is the material used for the case of a direct reading compass?

    <p>Non-magnetic metal or plastic</p> Signup and view all the answers

    What is the function of the azimuth card or dial in a direct reading compass?

    <p>To indicate direction</p> Signup and view all the answers

    What are the two common types of direct reading compasses in regular use?

    <p>Vertical panel mounted and suspended type</p> Signup and view all the answers

    What is the primary reason for filling compasses with a liquid?

    <p>To make them aperiodic</p> Signup and view all the answers

    What is the purpose of the damping devices in a compass?

    <p>To make the magnet system follow the magnetic meridians in the minimum of time without oscillating</p> Signup and view all the answers

    Why is it important to check the calibration of a new compass from overseas before using it on an Australian aircraft?

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

    What is the effect of the liquid in a compass on the movement of the magnet system and its spider?

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

    What is the purpose of the counterbalance weight in a compass?

    <p>To amplify the dip angle</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 is the primary purpose of compass compensation in an aircraft?

    <p>To minimize the deviation error by aligning the aircraft on known headings</p> Signup and view all the answers

    What is the effect of local magnetic fields in the aircraft on the magnetic compass?

    <p>It causes the compass to indicate a incorrect direction</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 term for the error in the indication of an installed magnetic compass caused by local magnetic fields?

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

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

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

    What is the result of adjusting the compensating magnets during compass calibration?

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

    What is the purpose of the compensator in a direct-reading compass?

    <p>To minimise the effects of local magnetic disturbances</p> Signup and view all the answers

    How are the magnetic fields required for correction produced in the compensator?

    <p>By rotating a small bevel pinion</p> Signup and view all the answers

    What is the direction of the magnetic field produced by the compensator dependent on?

    <p>The direction of the rotation of the pinion</p> Signup and view all the answers

    What is the error that the laterally orientated magnets are adjusted for during compass compensation?

    <p>Error on north/south headings</p> Signup and view all the answers

    What is the purpose of the bevel gears in the compensator?

    <p>To mesh with the bevel pinion</p> Signup and view all the answers

    What is the error that the longitudinally orientated magnets are adjusted for during compass compensation?

    <p>Error on east/west headings</p> Signup and view all the answers

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

    <p>AC synchronisation</p> Signup and view all the answers

    Where are flux valves typically positioned in an aircraft?

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

    What is the purpose of using non-magnetic materials for flux valve location and mounting?

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

    Why do some aircraft have two flux valves installed?

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

    What type of gyro is commonly used in remote compass systems to provide short-term stability of magnetic heading presentation?

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

    What information is provided by the remote compass system to the pilot's displays?

    <p>Magnetic heading and navigation data</p> Signup and view all the answers

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