02 Magnetism And Compasses

Question 1

In still air, you wish to fly a true heading of 315°. Variation is 4°W. Deviation is 2°E. What compass heading should you fly?

Answer 1

317°

Question 2

One purpose of a compass calibration is to reduce the difference, if any, between:

Answer 2

compass north and magnetic north.

Question 3

An aircraft is flying a Compass Heading of 124ºC. Compass Deviation = -3º, Magnetic Variation = 4ºW. What is the True Heading?

Answer 3

117ºT

C D M V T
124ºC -3º(W) 121ºM 4ºW 117ºT

Question 4

Direct reading compass (DRC) deviation table is: Course: 000 030 060 090 120 150 180 210 240 270 300 330 Steer: 359 030 061 092 121 150 178 209 242 272 298 331 Direct reading compass indicates a heading 242°. Magnetic variation in this area is 22°E. The true aircraft heading is:

Answer 4

262°

Compass heading is 242º. This is the heading the aeroplane is steering, thus find the appropriate number on the “steer” line. The corresponding number on the “course” line is the magnetic heading.

Then correct for variation to find the true heading.
Steer: 242º

Course: 240º

Var.: E22º

TH: 262º

Question 5

An aircraft is lined up on Runway 23, which is aligned with a magnetic bearing of 232°M. During pre-flight checks it is observed that the direct reading magnetic compass reads 243°M. What action should be taken by the flight crew in order to comply with maximum permissible deviation errors?

Answer 5

Cancel the flight and return to maintenance.

Question 6

Complete the following statement regarding magnetic variation. The charted values of magnetic variation on earth normally change annually due to:

Answer 6

magnetic pole movement causing numerical values at all locations to increase or decrease

Question 7

Given:

Compass Heading: 124°

Deviation: -3°

Variation: 4°W

Determine the True Heading.

Answer 7

117°

Question 8

In a remote indicating compass system the amount of deviation caused by aircraft magnetism and electrical circuits may be minimised by:

Answer 8

mounting the detector unit (flux valve) in the wingtip.

Question 9

A line drawn on a chart which joins all points where the value of magnetic variation is zero is called an:

Answer 9

agonic line

Question 10

Given:
Variation: 7°W
Deviation: 4°E

If the aircraft is flying a compass heading of 270, the true and magnetic headings are:

Answer 10

267°(T); 274°(M)

Question 11

An aircraft is lined up on Runway 24, which is aligned with a magnetic bearing of 242°M. In order to comply with maximum permissible deviation errors, the direct reading magnetic compass readings should be between:

Answer 11

232°- 252°

Question 12

Which of the following is an occasion for carrying out a compass swing on a Direct Reading Compass?

Answer 12

After an aircraft has passed through a severe electrical storm, or has been struck by lightning

Question 13

A direct reading compass should be swung when:

Answer 13

there is a large, and permanent, change in magnetic latitude

Question 14

The deviation of a compass is described as +4. This means that:

Answer 14

The compass heading will have a lower number in degrees that the magnetic heading.

Question 15

One purpose of compass calibration is to determine the deviation:

Answer 15

on any heading.

Question 16

An aircraft is lined up on Runway 05, which is aligned with a magnetic bearing of 047°M. In order to comply with maximum permissible deviation errors, the direct reading magnetic compass readings should be between:

Answer 16

037° - 057°

Question 17

An aircraft is purchased in New Zealand and taken to operate from Teeside, UK. The compass needs to be swung; this is because:

Answer 17

There was a large change of latitude

Question 18

During pre-flight check, serviceability of a direct reading standby compass indication can be compared preferably with: 1 - runway direction during line-up 2 - main compass indication 3 - test VOR indication 4 - an ADF bearing 5 - an Airborne Weather Radar bearing The combination regrouping all the correct statements is:

Answer 18

1 and 2

Question 19

Deviation on the standby compass is:

Answer 19

Dependent on the heading of the aircraft.

Question 20

The outer marker of an ILS with a 3° glide slope is located 4.6 NM from the threshold. Assuming a glide slope height of 50 FT above the threshold, the approximate height of an aircraft passing the outer marker is:

Answer 20

1450 FT

On the CRP 5 put the 60/1 triangle at 3 for 3º glideslope.
4.6nm x 6080ft=27968ft so 28000. Find 28000 on the inside scale read opposite so 14.
1400ft plus 50ft above threshold = 1450ft

Question 21

A transport aircraft is purchased in Australia and flown to Europe where it will be engaged in commercial operations with a base in Germany.

It will be necessary to perform a compass swing procedure because:

Answer 21

there was a large change of latitude.

Question 22

The Earth can be considered as being a magnet with the:

Answer 22

BLUE pole near the North Pole of the Earth and the direction of the magnetic force pointing straight DOWN to the Earth’s surface.

Question 23

At a specific location, the value of magnetic variation:

Answer 23

varies slowly over time

Question 24

Direct reading compass (DRC) deviation table is: Course: 000 030 060 090 120 150 180 210 240 270 300 330 Steer: 359 030 061 092 121 150 178 209 242 272 298 331 You have to maintain the HEADING 155°(T). Magnetic variation is 10°W. The compass heading to follow is:

Answer 24

164°

Question 25

The force acting on the needle of a direct reading compass varies:

Answer 25

directly with the horizontal component of the earth’s magnetic field

(The force action on the compass needle is directly proportional to the horizontal component of the Earth’s field (H) and inversely proportional to the vertical component of the Earth’s field (Z).(

Question 26

What is the maximum tolerance allowed on the magnetic compass with correction applied on a (CS-25) large aeroplane?

Answer 26

10°