Vertical Speed Indicator - VSI

Question 1

Principle of VSI

Answer 1

measures the pressure difference between the capsule and casing which is created using a choke

Question 2

Vmo calculated and expressed as?

Answer 2

calculated as EAS and expressed as CAS

Question 3

Errors of VSI

Answer 3

BLIPT

Question 4

Static port partially blocked in VSI

Answer 4

underread during climb and descent

Question 5

The choke is partially blocked in VSI

Answer 5

Overread in climb/descent

Question 6

VSI leakage inside the pressurised hall

Answer 6

STULO

Question 7

VSI leakage in unpressurised hall

Answer 7

reads zero

Question 8

IVSI fitted with?

Answer 8

Dashpot accelerometer

Question 9

Drawbacks of IVSI

Answer 9

During turn it shows climb and oscillates in turbulence

Question 10

Serviceability checks of VSI

Answer 10

200 ft from -20 to +50

300 ft for outside these temp

Question 11

Position Pressure and Maneuveribility in VSI

Answer 11

climb in acc and descent in dec

Question 12

How is temperature compensated in VSI

Answer 12

by the use of a capillary and an orifice