Earths Magnetism, Variation And Deviation

Question 1

Variation

Answer 1

The angle between True North and Magnetic North / angular distance between them

Question 2

Isogonals

Answer 2

Lines of equal variation which coverage at the geographic and magnetic N/S poles

Question 3

Agonic Line

Answer 3

Lines of 0 variation

Question 4

Variation West (-)

Answer 4

Magnetic Best

Question 5

Variation East (+)

Answer 5

Magnetic Least

Question 6

Maximum Dip

Answer 6

Occurs at the magnetic poles at an angle of 90 degrees

Least dip occurs on the magnetic equator

Question 7

Maximum Variation

Answer 7

180 degrees

Between the true north and the magnetic north

Question 8

Aclinic Lines

Answer 8

Lines joint 0 dip

Question 9

Deviation

Answer 9

The angular distance between the magnetic north and the compass reading

Question 10

Deviation West (-)

Answer 10

Compass best

Question 11

Deviation East (+)

Answer 11

Compass least

Question 12

EASA limit for DRC

Answer 12

+/- 10 degrees

Normally would only be ~3

Question 13

DRC

Answer 13

Direct reading compass

Standby

Question 14

DRC Serviceability Tests

Answer 14

Check general condition
Check indication against runway or other compass system
Check when carrying magnetic freight or large amounts of ferrous metal

Question 15

Require Compass Swing When

Answer 15

Large change of base latitude 
Lightening Strike 
Major equipment change 
Parked for long periods of time 
New compass fitted
When suspected deviation 
Specified in maintenance schedule

Question 16

CDMVT

Answer 16

Compass 
Deviation 
Magnetic 
Variation
True