Vertical Speed Indicator

Question 1

What scale does VSI use?

Answer 1

Logarithmic.

Question 2

What does VSI measure, pressure wise?

Answer 2

Static.

Question 3

In an instantaneous vertical speed indicator, what is used to quickly respond to altitude chnages?

Answer 3

An accelerator unit.

Question 4

What makes an instantaneous vertical speed unit different to a normal one other than its accelerator unit?

Answer 4

A dashpot unit.

Question 5

If there is a leak in a pressurised aircraft, what happens to the vertical speed?

Answer 5

Equalises with cabin altitude.

Question 6

What percentage is a typical glide slope?

Answer 6

5%

Question 7

How do you calculate rate of decent?

Answer 7

5 x groundspeed.

Question 8

When can the instantaneous vertical speed indicator give erroneous readings?

Answer 8

Turbulence or turns.

Question 9

What errors does a Vertical Speed Indicator suffer from?

1. Position error
2. Instrument error
3. Hyperbaric error
4. Pitot and static error
5. Manoeuvring error
6. Lag/timing

Answer 9

1,2,5,6

Question 10

The VSI is supplied with blank pressure only, and thus is only affected by blockage of the blank port of leakage of the blank pressure line.

Answer 10

Static

Question 11

To which of the following errors is a barometric VSI subject?

1. Time lag
2. Temperature
3. Barometric
4. Position
5. Instrument
6. Total static source blockage
7. Total pressure probe blockage

Answer 11

1,4,5,6