Earth's Magnetic Poles

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What is the location of the Earth's magnetic south pole?

At 74°N 101°W (correct)

At the geographic North Pole

At the magnetic North Pole

At the equator

Why do aeronautical charts need to be periodically updated?

Due to changes in aircraft heading

Due to the shift in the magnetic poles and lines of flux (correct)

Due to changes in the Earth's geographic poles

Due to variations in the Earth's magnetic field

What is the direction that a magnetic compass aligns to?

Magnetic North (correct)

Geographic North Pole

True North

The Earth's axis

What is the term for the difference between true north and magnetic north at a geographic location?

Magnetic Variation Signup and view all the answers

What is the direction of the grid of an aeronautical navigation chart?

Towards True North Signup and view all the answers

What does not affect magnetic variation?

Aircraft heading Signup and view all the answers

Why is the instrument panel not an ideal place to install a direct-reading compass?

Due to the concentration of magnetic fields around it Signup and view all the answers

What is the main advantage of mounting the magnetic compass sensing element away from the instrument panel?

To eliminate the problem of interfering magnetic fields Signup and view all the answers

What is the primary component of a pure remote-indicating compass system?

A magnetic field detector and a heading indicator Signup and view all the answers

What is the benefit of incorporating a directional gyro in a remote-indicating compass system?

It provides inherent stability during turns and acceleration changes Signup and view all the answers

What is the purpose of a flux valve in a remote-indicating compass system?

To provide long-term reliability of the display Signup and view all the answers

What is the primary limitation of a pure remote-indicating compass system?

It suffers from many inherent problems Signup and view all the answers

What is the primary function of the flux valve in remote indicating compasses?

To detect the Earth's magnetic field Signup and view all the answers

What is the purpose of the Hooke's joint in the flux valve design?

To permit the sense element to tilt to about 25° Signup and view all the answers

What is the characteristic property of Permalloy, the material used to manufacture the spokes and horns?

It is easily magnetised, but loses all its magnetism once the external force is removed Signup and view all the answers

What is the purpose of the damping oil in the flux valve assembly?

To minimise pendulous jarring caused by rapid attitude changes Signup and view all the answers

Why is navigating in the vicinity of the poles difficult with a flux valve compass?

Because the Earth's magnetic field is too weak Signup and view all the answers

What is the function of the collector horns in the flux valve assembly?

To act as individual flux collectors Signup and view all the answers

What is the purpose of an electronic compass calibrator?

To alter the alignment of a magnetic field around a flux valve Signup and view all the answers

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

It modifies the voltage output slightly Signup and view all the answers

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

To concentrate the magnetic field Signup and view all the answers

What is the function of a datum compass?

To take readings at a certified compass swinging site Signup and view all the answers

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

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

How does an inertial navigation system relate to a compass?

It is used to swing a remote or direct reading compass Signup and view all the answers

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

To induce a magnetic field in each spoke Signup and view all the answers

What is a characteristic of a complex aircraft operated by large organisations?

It has access to an electronic compass calibrator system Signup and view all the answers

What is the output of the flux valve when it's not exposed to an external magnetic field?

A three-wire output with equal voltages Signup and view all the answers

What is the purpose of a certified compass swinging site?

To obtain a magnetic heading unaffected by local deviation Signup and view all the answers

What is the process of taking a reading with a datum compass?

By sighting an external reference point on the aircraft Signup and view all the answers

What is the result of the modification of the voltage output from the secondary coils?

An indication of the aircraft's heading Signup and view all the answers

Earth's Magnetic Poles

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Questions and Answers

What is the location of the Earth's magnetic south pole?

Why do aeronautical charts need to be periodically updated?

What is the direction that a magnetic compass aligns to?

What is the term for the difference between true north and magnetic north at a geographic location?

What is the direction of the grid of an aeronautical navigation chart?

What does not affect magnetic variation?

Why is the instrument panel not an ideal place to install a direct-reading compass?

What is the main advantage of mounting the magnetic compass sensing element away from the instrument panel?

What is the primary component of a pure remote-indicating compass system?

What is the benefit of incorporating a directional gyro in a remote-indicating compass system?

What is the purpose of a flux valve in a remote-indicating compass system?

What is the primary limitation of a pure remote-indicating compass system?

What is the primary function of the flux valve in remote indicating compasses?

What is the purpose of the Hooke's joint in the flux valve design?

What is the characteristic property of Permalloy, the material used to manufacture the spokes and horns?

What is the purpose of the damping oil in the flux valve assembly?

Why is navigating in the vicinity of the poles difficult with a flux valve compass?

What is the function of the collector horns in the flux valve assembly?

What is the purpose of an electronic compass calibrator?

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

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

What is the function of a datum compass?

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

How does an inertial navigation system relate to a compass?

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

What is a characteristic of a complex aircraft operated by large organisations?

What is the output of the flux valve when it's not exposed to an external magnetic field?

What is the purpose of a certified compass swinging site?

What is the process of taking a reading with a datum compass?

What is the result of the modification of the voltage output from the secondary coils?

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