ASI

Question 1

ASI - Operation??

Answer 1

Measures difference between Pito Pressure and Static Pressure

Question 2

How does asi measure speed

Answer 2

Dynamic Pressure is directly proportional top speed

Therefore by measure static pressure and subtracting it from total (Pito) pressure speed can be referenced

Question 3

Equations

Answer 3

D + S = P

D = P - S

Question 4

ASI construction

Answer 4

Capsule supplied by Pito pressure (D+S)

Case supplied with Static Pressure - Equalizes (cancels) static pressure in capsule and whats left is dynamic Pressure.

Question 5

ERRORS + Corrections

Answer 5

Instrument - Card
Pressure or Pos - Card
IAS - Ins and Pos = Calibrated (CAS)
Density - NAV Computer CAS - Desinty = TAS
Comprehensibility - High speed causes dynamic pressure to be too high. IAS OVEREADS

Question 6

EAS

Answer 6

Equivalant air speed - Only corrected for comprehensibility

Question 7

ASI colours

Answer 7

White - Flap operating speed range VSO top end is VFE
Green - Normal - VNO VS1 (stall speed with flaps)
Yellow - Caution smooth air only
Red - VNE

Question 8

Leaks Leaks where? Question invalid

Answer 8

ASI will underead

Question 9

Blockages Both Pito and Static - Level Flight

Answer 9

last recorded speed

If static - will read correctly (So long as no static press change)

Question 10

Blockages (Bot PITO and Static) - climb/descend

Answer 10

Pito - Climb = Overread (Case pressure too low)

Static block Climb = Underead Case pressure high - Capsule pressure low