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Flight instruments
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===Vertical speed indicator=== {{main|Vertical speed indicator}} ;[[Image:Vertical speed indicator.PNG|left|100px]] The VSI (also sometimes called a [[variometer]], or rate of climb indicator) senses changing air pressure, and displays that information to the pilot as a rate of climb or descent in feet per minute, meters per second or knots.<ref name=faa/>{{rp|3-8 to 3-9}} {{clear}}
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