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vertical speed indicator

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vertical speed indicator

[′vərd·ə·kəl ¦spēd ‚in·də‚kād·ər]
(aerospace engineering)
rate-of-climb indicator
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

vertical speed indicator (VSI)

vertical speed indicator (VSI)
A flight instrument that indicates the rate of climb or descent or the zero, or level, position at 9 o'clock. The VSI is a sensitive pressure gauge that senses the rate of change of static pressure. Atmospheric pressure is led directly into an aneroid capsule or a diaphragm contained within the case of the instrument. Air is permitted to leak at a relatively slow rate through a capillary tube into the casing. The difference between the quick change in pressure within the aneroid capsule and the relatively slow rate at which this pressure is equalized within the case causes the capsule to expand or contract. This movement is magnified and indicated on the dial through a system of gearing. See also instant rate of climb indicator.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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References in periodicals archive
The pilot had to first process the information it received from the attitude indicator, altimeter, airspeed indicator, directional gyro/horizontal situation indicator, turn coordinator and vertical speed indicator through her vision, compare it with navigational information and develop, on her own, a three-dimensional picture of where the airplane was in space-time.
Double or nothing: Your glass panel probably has only one copy of a key component, the ADHRS. What happens when it fails depends on the other tools in your cockpit
A blockage in the static system also affects the altimeter and vertical speed indicator (VSI).
Pitot-static systems: even with a state-of-the-art glass panel, a simple blockage can ruin your day. Your reaction depends on which of two basic blockages you re experiencing
Garmin's "vertical speed indicator" is one of the most accurate of the virtual instruments presented on the GPSMAP x96's emergency panel.
Handheld six-pack? Garmin's late-model GPS navigators feature a built-in virtual panel to use when the real one soils the bed. What it can do, how it works and how to use it
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