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General Navigation > Earth dims, CDMVT, dip (22-05-18) > Flashcards

Earth dims, CDMVT, dip (22-05-18) Flashcards

1
Q

What is the circumference of the earth?

A

21600nm

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2
Q

What is the radius of the earth at the equator?

A

6883.7nm

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3
Q

What is the inclination of the Earth in its orbit?

A

23.5deg

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4
Q

What is the radius of the Earth at the poles?

A

6860.6nm

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5
Q

What is the diameter at the equator called?

A

The major axis

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6
Q

What is the diameter of the earth at the poles called?

A

the minor axis

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7
Q

What is the earths compression factor?

A

1/298

0.3%

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8
Q

What is the world standard for charts?

A

WGS84

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9
Q

Regarding heading and track, which way to aircraft always drift?

A

From heading to track

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10
Q

What is a sidereal circuit?

A

The 960 year cycle that the magnetic pole rotates around the true North Pole.

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11
Q

What is an isogonal?

A

A line on a chart joining points of equal variation.

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12
Q

What is an agonic line?

A

A line on a chart joining points of zero variation.

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13
Q

Where does deviation originate from?

A

The localised magnetic fields produced by circuitry in the plane.

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14
Q

What is it called when 2 things are directly opposite each other, such as the true north and South Pole.

A

Antipodal

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15
Q

What is magnetic dip?

A

Where the earths magnetic field is slightly inclined to the horizontal due to being closer to the poles.

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16
Q

When is horizontal directive force the strongest?

A

Half way between the magnetic poles.

17
Q

What is magnetic field strength measured in?

A

Micro Teslas

muT

18
Q

What are isoclines?

A

Lines on a chart joining points of equal magnetic dip.

19
Q

What is an aclinic line?

A

Lines on a chart joining points of zero dip

(magnetic equator)

20
Q

What would call for compass swing to happen?

A

Reported fault

scheduled servicing

struck by lightning

major component change

static on ground for a long period

A/C changes working latitude

A/C has carried ferrous material

21
Q

What is meant when a material is permeable?

A

It is easily magnetisable

22
Q

What is meant by soft iron magnetism?

A

When a material is easily magnetisable but also loses magnetism quickly

23
Q

What is meant by hard iron magnetism?

A

When a magnetised material retains its magnetism for a long duration.

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