Introduction and Pressure Sensing Flashcards Preview

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Flashcards in Introduction and Pressure Sensing Deck (15):
1

6 basic instruments

ASI
VSI
Artificial Horizon
Turn and bank
Compass
Altimeter

2

Pressure instruments

ASI
VSI
Altimeter
Mach meter

3

Advantages of analogue

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

4

Different displays

Quantitative - digital display, numerical

Qualitative - analogue with a needle

5

LRU

Line replaceable unit

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

6

1 pascal =

1 newton per m squared

7

1 hpa =

100 pascals
1mb

8

1 bar =

1,000mb = 1,000hpa

9

Psi

Pounds per square inch

10

Isa sea level psi

14.7

11

Gauge pressure

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

12

Difference between pressure and aneroid capsule

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

13

Instrument error

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

14

Manoeuvre error

Caused by doing a manoeuvre and slightly changing the airflow

More significant in the pitch

15

Position error

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