The Compass | Compass Swing

Question 1

Compass swings should be performed ___

Answer 1

• After a shock to the airframe
• After a lightning strike
• Left on same heading for long time
• Move to different latitude
• Major components/installations change

Question 2

Aircraft magnetism can be classified into 3 components

Answer 2

• Hard Iron
• Soft Iron
• Electrical

Question 3

Hard iron is ____ and arises from

Answer 3

permanent, the aircraft being on a particular heading at a particular latitude for some time when it was being made

Question 4

___ iron is the controlling factor in deviation

Answer 4

hard

Question 5

Hard iron’s effect is ___ with hammering

Answer 5

increased

Question 6

Hard iron’s effect ___ when the aircraft starts flying, but will never completely disappear

Answer 6

weakens

Question 7

Hard iron has ____ and ___ effects which can be corrected with magnets

Answer 7

vertical horizontal

Question 8

Hard iron can be visualised as ___ components at the compass position

Answer 8

3

Question 9

All hard iron effects are represented by ___ letters

Answer 9

capital

Question 10

Hard iron does (not) change with latitude as the H force is ___ and the magnets are more easily deflected

Answer 10

not weaker

Question 11

P is ___ and ___

Answer 11

fore aft

Question 12

P is ___ when it pulls the red end of the compass needle to the rear.

Answer 12

minus

Question 13

P is ___ if it pulls the red end of the compass needle to the front

Answer 13

plus

Question 14

P will cause a deviation that depends on the component’s ___.

Answer 14

polarity

Question 15

P is maximum when facing ___ and ___

Answer 15

East and West

Question 16

P is _ when facing South

Answer 16

0

Question 17

Maximum deviation from P is called ___ ___, which is expressed as an angle

Answer 17

Coefficient B

Question 18

Maximum deviation from P is called coefficient ___, which is expressed as an angle

Answer 18

Coefficient B

Question 19

Q is ___ to ___

Answer 19

left to right

Question 20

Q is ___ if it pulls the red end of the compass needle to starboard

Answer 20

plus

Question 21

Q is ___ if it pulls the red end of the compass needle to port

Answer 21

minus

Question 22

Q is maximum on ___ and ___

Answer 22

north and south

Question 23

Maximum deviation from Q is resolved with coefficient ____

Answer 23

coefficient C

Question 24

R is ___ and ___

Answer 24

up and down

Question 25

R is ___ if it pulls the red end of the compass needle down

Answer 25

plus

Question 26

R is ___ if it pulls the red end of the compass needle up

Answer 26

minus

Question 27

R is always ___ if built in the Northern Hemisphere

Answer 27

positive

Question 28

Soft iron is a ___ influence that only appears when the metal in the aircraft is affected by the Earth's magentic field and electrical systems

Answer 28

temporary

Question 29

The soft iron effect depends on the ___ and ___ of the aircraft, and its geographic position

Answer 29

heading attitude

Question 30

___ iron effect changes with heading

Answer 30

Soft

Question 31

The soft iron vertical heading is stronger at ___ latitudes, because H is ___

Answer 31

high reduced

Question 32

The horizontal element is split further into _ and _ to match the longitudinal and lateral axis of the aircraft

Answer 32

X Y

Question 33

Z is the ___ axis of the aircraft

Answer 33

vertical

Question 34

Soft iron is visualised as coming from _ soft iron rods near the compass, they are:

Answer 34

``` 9 aX bY cZ dX eY fZ gX hY kZ ```

Question 35

cZ is __ and __

Answer 35

fore and aft

Question 36

cZ acts like _ and _, and does (not) change with heading

Answer 36

P Q not

Question 37

_ will only change sign if moved into the other magnetic hemisphere

Answer 37

Z

Question 38

fZ is ___

Answer 38

athwartships

Question 39

fZ is like ___ and ___, does (not) change polarity with heading

Answer 39

P Q not

Question 40

kZ is the ___ axis

Answer 40

vertical

Question 41

Residuals should not exceed _ degree for a gyromagnetic compass

Answer 41

1

Question 42

Residuals should not exceed _ degrees for a DRC

Answer 42

3

Question 43

Combined changes should not exceed _ degrees

Answer 43

2

Question 44

Deviations in level flight should not exceed __ degrees

Answer 44

10

Question 45

The maximum limits are +/- _ degrees for a gyromagnetic compass, and +/-__ degrees for a DRC

Answer 45

3 15

Question 46

Error _ is corrected first, then _, then _

Answer 46

B, C, A

Question 47

___ magnets are used in a E2Bcompass

Answer 47

Scissor

Question 48

___ magnets are used in a gyro compass

Answer 48

Electro

Question 49

Deviations from the components of hard and soft iron can be resolved into the components ___

Answer 49

- Coefficient A - Coefficient B - Coefficient C - Coefficient D - Coefficient E

Question 50

Coefficient A is ___ on all headings

Answer 50

constant

Question 51

Coefficient A is found by dividing the sum of the deviations on the cardinal and intercardinal points by _

Answer 51

8

Question 52

Coefficient A is caused by ___ soft iron around the compass and is similar to the deviation caused by the lubber line being out of alignment

Answer 52

assymetric

Question 53

___ A may be caused by an error in the magnetic bearing of an object used for swinging

Answer 53

Apparent

Question 54

Coefficient B is the ___ and ___ magnet

Answer 54

fore aft

Question 55

Coefficient B is used to resolve deviations from _ + __

Answer 55

P cZ

Question 56

Coefficient B produces maximum values on __ and ___, with zero on ___ and ___

Answer 56

East West North South

Question 57

Coeffient B varies with the ___ of the heading

Answer 57

sin

Question 58

Coefficient B is the result of dividing _-_ by 2

Answer 58

E-W

Question 59

Coefficient C is the ___ magnet

Answer 59

athwartships

Question 60

Coefficient C has maximum values on _ and _

Answer 60

N S

Question 61

Coefficient C varies as the ___ of the heading

Answer 61

cosine

Question 62

Coefficient C is used to resolve deviations from _ + __

Answer 62

Q cz

Question 63

Coefficient C is the result of dividing _-_ by 2

Answer 63

N-S

Question 64

Coefficient D is ___ iron on quadrantals

Answer 64

soft

Question 65

Coefficient E is ___ iron on cardinal points

Answer 65

soft