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Exploring the Intricacies of the Airspeed Indicator

Pilot's Life Blog

Static vents that measure static pressures are usually on the lower side of the plane, where the air stream isn’t as turbulent. True Airspeed vs Indicated Airspeed VS Equivalent Airspeed Since airspeed indicators use air pressure to measure speed, the indicated airspeed can be less than the actual airspeed at higher altitudes.