Turbine Aeroplane: Aerodynamics, Structures and Systems

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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?

Non-magnetic metal or plastic Signup and view all the answers

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

To indicate direction Signup and view all the answers

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

Vertical panel mounted and suspended type Signup and view all the answers

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

To make them aperiodic Signup and view all the answers

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

To make the magnet system follow the magnetic meridians in the minimum of time without oscillating 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?

To ensure the compass is calibrated for operation in southern latitudes 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?

It sets up small eddies which are quickly dissipated Signup and view all the answers

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

To amplify the dip angle Signup and view all the answers

What type of liquids are normally used in compasses?

Mineral or alcohol Signup and view all the answers

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

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

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

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

Deviation Signup and view all the answers

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

They distort the magnetic field Signup and view all the answers

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

Decreased deviation error Signup and view all the answers

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

To minimise the effects of local magnetic disturbances Signup and view all the answers

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

By rotating a small bevel pinion Signup and view all the answers

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

The direction of the rotation of the pinion Signup and view all the answers

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

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

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

To mesh with the bevel pinion Signup and view all the answers

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

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

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

AC synchronisation Signup and view all the answers

Where are flux valves typically positioned in an aircraft?

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

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

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

Why do some aircraft have two flux valves installed?

To provide redundancy and ensure continuous operation 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?

Electrically driven directional gyro Signup and view all the answers

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

Magnetic heading and navigation data Signup and view all the answers

Turbine Aeroplane: Aerodynamics, Structures and Systems - Compass Types

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