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

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Flashcards in Earth dims, CDMVT, dip (22-05-18) Deck (23)
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1

What is the circumference of the earth?

21600nm

2

What is the radius of the earth at the equator?

6883.7nm

3

What is the inclination of the Earth in its orbit?

23.5deg

4

What is the radius of the Earth at the poles?

6860.6nm

5

What is the diameter at the equator called?

The major axis

6

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

the minor axis

7

What is the earths compression factor?

1/298

0.3%

8

What is the world standard for charts?

WGS84

9

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

From heading to track

10

What is a sidereal circuit?

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

11

What is an isogonal?

A line on a chart joining points of equal variation.

12

What is an agonic line?

A line on a chart joining points of zero variation.

13

Where does deviation originate from?

The localised magnetic fields produced by circuitry in the plane.

14

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

Antipodal

15

What is magnetic dip?

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

16

When is horizontal directive force the strongest?

Half way between the magnetic poles.

17

What is magnetic field strength measured in?

Micro Teslas

muT 

18

What are isoclines?

Lines on a chart joining points of equal magnetic dip.

19

What is an aclinic line?

Lines on a chart joining points of zero dip

(magnetic equator)

20

What would call for compass swing to happen?

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

What is meant when a material is permeable?

It is easily magnetisable

22

What is meant by soft iron magnetism?

When a material is easily magnetisable but also loses magnetism quickly

23

What is meant by hard iron magnetism?

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