Vertical Speed Indicator

Vertical Speed Indicator (VSI) is an instrument in an aircraft that displays the rate of climb or descent in feet per minute. It measures the difference in pressure between the static pressure from the pitot-static system and the pressure inside the diaphragm of the VSI. The VSI is an important instrument for pilots to maintain a safe and efficient flight, especially during takeoff and landing. It helps pilots to control the aircraft's altitude and rate of climb or descent, and to maintain a stable flight. The VSI is also used to determine the aircraft's performance and fuel efficiency.
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