Remove Descent Remove Tarmac Remove True Airspeed
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The Pitot-Static System: How It Works

Pilot Institute

To find True Airspeed (TAS), youll need to account for these effects. As the name implies, the VSI shows the rate of the aircrafts climb or descent. It shows the rate of climb or descent in feet per minute. The faster the rate of climb or descent, the greater the differential pressure, and the more the needle will swing.