Introduction and Pressure Sensing

Question 1

6 basic instruments

Answer 1

ASI 
VSI 
Artificial Horizon 
Turn and bank 
Compass 
Altimeter

Question 2

Pressure instruments

Answer 2

ASI
VSI
Altimeter
Mach meter

Question 3

Advantages of analogue

Answer 3

Can see approx indications easily
Easy to see abnormal indications easily when with a set
Good at showing rate of change

Question 4

Different displays

Answer 4

Quantitative - digital display, numerical

Qualitative - analogue with a needle

Question 5

LRU

Answer 5

Line replaceable unit

Standardised dimensions so it can be easily swapped e.g ADC (air data computer)

Question 6

1 pascal =

Answer 6

1 newton per m squared

Question 7

1 hpa =

Answer 7

100 pascals

1mb

Question 8

1 bar =

Answer 8

1,000mb = 1,000hpa

Question 9

Psi

Answer 9

Pounds per square inch

Question 10

Isa sea level psi

Answer 10

14.7

Question 11

Gauge pressure

Answer 11

Difference between the pressure measured and the atmospheric air (ambient air)

Question 12

Difference between pressure and aneroid capsule

Answer 12

Aneroid - partially evacuated, air was sucked out of it before being sealed

Pressure - same as aneroid but has a hole inside e.g for pitot, ASI

Question 13

Instrument error

Answer 13

Caused within the instrument e.g play with linkages, friction etc

Question 14

Manoeuvre error

Answer 14

Caused by doing a manoeuvre and slightly changing the airflow

More significant in the pitch

Question 15

Position error

Answer 15

Due to small modifications of the airflow caused by the position of the pitot tube