Week 2: AC Instruments Inspection/Testing

Question 1

The magnetic compass is required by CARS for what type of flight?

Answer 1

VFR/IFR

Question 2

What is the vertical line on the magnetic compass called and what can it compensate for?

Answer 2

Lubber line and can be bended to compensate for parallax error

Question 3

The earth’s lines of flux flow which way?

Answer 3

South to North, parallel to equator

Question 4

What info do we want from the compass?

Answer 4

Horizontal direction towards the poles

Question 5

What is the Angle of Dip?

Answer 5

the vertical component, angle between the earth’s surface and mag. lines of force

Question 6

What is it called when the aircraft compass tips during pitch/roll?

Answer 6

Magnetic Dip

Question 7

What is Variation/Declination?

Answer 7

The angular difference between magnetic meridian and true meridian at any point

Question 8

What are ISOGONIC lines?

Answer 8

They connect the points of equal variation only when flying N to S (longitudinally)

Question 9

This part of the magnetic compass has 2 long thin parallel bar magnets on a pivot

Answer 9

Sensing magnets

Question 10

This part of the magnetic compass allows magnets to align with the earth flux lines

Answer 10

The Pivot

Question 11

What is the purpose of the Float?

Answer 11

Reduce load/friction on pivot

Question 12

What is the purpose of the Compass Card?

Answer 12

has a scale and NSEW on it

Question 13

What is the purpose of the jewel?

Answer 13

For less friction

Question 14

This part of the magnetic compass is situated with the longitudinal axis of the aircraft?

Answer 14

Lubber Line

Question 15

This part of the magnetic compass has a CofG of float, magnet, compass card assy is below the pivot point so the assy will be pendulous on the pivot and card will be horizontal?

Answer 15

Horizontal Reference

Question 16

What is the purpose of the liquid?

Answer 16

Damps out the rocking/rotational oscillations

Question 17

This part of the magnetic compass expands and contracts with temperature changes

Answer 17

Expansion unit

Question 18

What is the purpose of the Compensator?

Answer 18

To compensate NS or EW

Question 19

Where is the one place that the compass works perfectly?

Answer 19

Equator

Question 20

What is Deviation?

Answer 20

Error caused by magnetic fields in an aircraft conflicting with the Earth’s magnetic field

Question 21

Is deviation affected by geographic location?

Answer 21

No

Question 22

How do you minimize deviation?

Answer 22

Compass swing

Question 23

When performing a compass swing, how much do you compensate at North and East, south and west?

Answer 23

N and E is 100%

S and W is 50%

Question 24

When performing a compass swing what status is the aircraft in?

Answer 24

Everything on for flight

Question 25

On a standby compass, if the deviation is greater than 10 what must you do?

Answer 25

Do it again

Question 26

What is the purpose of the compass correction card?

Answer 26

Shows correction for any heading

Question 27

This type of compass has reduced errors, has the main magnet on shaft and not on a float

Answer 27

Vertical Card Magnetic Compass

Question 28

What is the purpose of a JetCal EGT tester?

Answer 28

Calibration test unit for a turbine engine

Question 29

What are the major components of the JetCal tester?

Answer 29

thermocouple. rpm, EGT indicator

Question 30

What should you never use to check the potentiometer for continuity?

Answer 30

Voltmeter

Question 31

What temperature should the heater probes never exceed?

Answer 31

900C