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rate-of-climb indicator[′rāt əv ′klīm ′in·də‚kād·ər]
A device used to indicate changes in the vertical position of an aircraft by comparing the actual outside air pressure to a reference volume that lags the outside pressure because a calibrated restrictor imposes a lag-time constant to the reference pressure volume. Also known as rate-of-descent indicator; vertical speed indicator.
An aircraft instrument indicating the rate of climb or descent in feet per minute or meters per second. The same as a vertical speed indicator,* or VSI.