The Vertical Speed Indicator Flashcards
The which part/parts are static pressure fed to?
To both the capsule and the airtight case
The vertical speed indicator is fed with with static pressure both to the capsule and the case, which one has a restrictive choke installed?
The one routed to the case
In level flight the static pressure inside the capsule ____ the _____ pressure
In level flight the static pressure inside the capsule equals the delayed pressure
A short time interval must elapse before new pressures reach the instrument and a pressure differential is established, this results in what error?
Time lag error
The VSI show a momentary climb or descent if speed is rapidly increased, noticeable during take-off. This error is called?
Position or pressure error
What is manoeuvre induced error?
Fluctuations of pressure at the static vent during rapid changes of altitude can cause a false indication
What would occur if any of the static vents are blocked?
The VSI will read zero
If one breaks the VSI glass, what would be the most pronounced effect?
The VSI will reading will be reversed
If alternate static source is enabled, the VSI could over-read by what amount?
300 feet
If a leak would occur in a pressurised aeroplane, what would be the initial VSI indication?
Since cabin pressure will be high, the VSI would show a high rate of descent
The VSI obtains a reading due?
The pressure differential between the static air pressure in the capsule and the delayed static pressure fed to the case
VSI time lag is most severe at?
High atitude
Define position or pressure error
If static pressure is subject to position error, then the VSI can show a momentary climb or descent if speed is rapidly changed, noticeable during take-off
Define manoeuvre induced error?
Fluctuations of pressure at the static vent during rapid changes of altitude can cause a false indication
The VSI must be adjusted to read?
Zero before every flight
