Aeroplane Aerodynamics and Navigation

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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?

Magnetic poles Signup and view all the answers

What does the pilot need to correct for when navigating?

Variation Signup and view all the answers

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

Direct-reading compass Signup and view all the answers

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

To obtain the minimum possible residual deviation error Signup and view all the answers

What is the primary cause of deviation error in an aircraft's magnetic compass?

Local magnetic fields in the aircraft Signup and view all the answers

What is the purpose of the compass correction card in an aircraft?

To correct for deviation errors during flight Signup and view all the answers

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

They distort the magnetic field Signup and view all the answers

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

It reduces the deviation error Signup and view all the answers

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

During the calibration phase Signup and view all the answers

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

To provide more accurate readings Signup and view all the answers

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

To provide a reference point for the compass card Signup and view all the answers

Why is the magnet system assembly mounted pendulously?

To align the magnet with the horizontal component of the lines of force Signup and view all the answers

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

It remains constant at 3 degrees 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?

It becomes virtually unreadable 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?

To enable the compass to be used in different regions Signup and view all the answers

Where are flux valves typically positioned in an aircraft?

In the wingtips or top of the tailfin Signup and view all the answers

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

To minimize the effects of local magnetism Signup and view all the answers

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

To provide redundancy Signup and view all the answers

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

Electrically driven directional gyro Signup and view all the answers

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

To sense magnetic heading information Signup and view all the answers

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

All aircraft systems dependent on magnetic heading information Signup and view all the answers

Why does the compass card need to be pendulous?

To minimize the effects of magnetic dip Signup and view all the answers

What happens to the pendulous card during aircraft manoeuvres?

It is displaced from the vertical due to aircraft acceleration Signup and view all the answers

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

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

What is the benefit of a pendulous compass card?

Ability to operate at higher latitudes without excessive tilt Signup and view all the answers

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

Aircraft acceleration during flight Signup and view all the answers

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

The pendulous card is influenced by the vertical component Signup and view all the answers

Aeroplane Aerodynamics and Navigation

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Questions and Answers

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

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

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

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

What does the pilot need to correct for when navigating?

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

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

What is the primary cause of deviation error in an aircraft's magnetic compass?

What is the purpose of the compass correction card in an aircraft?

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

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

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

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

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

Why is the magnet system assembly mounted pendulously?

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

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

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

Where are flux valves typically positioned in an aircraft?

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

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

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

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

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

Why does the compass card need to be pendulous?

What happens to the pendulous card during aircraft manoeuvres?

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

What is the benefit of a pendulous compass card?

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

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

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