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Vertical Speed Indicator: An instrument that measures the rate of climb or descent of an aircraft based on changes in atmospheric pressure. The VSI, also known as the vertical velocity indicator or the rate of climb indicator, displays the rate of change in feet per minute (fpm). The VSI provides essential information to pilots to maintain a steady vertical speed, ensuring a safe and efficient flight. The VSI is a critical component in modern aircraft and is essential for both visual and instrument flight rules.
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