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The Classic Boeing Airspeed Indicator

AeroSavvy

Ram air from a pitot tube and static (undisturbed) outside air from a static port, usually a hole on the side of the fuselage. Airspeed indicators need air from a pitot tube and static air from a static port Small general aviation aircraft have airspeed indicators with air hoses connected directly to the pitot and static sources.

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Exploring the Intricacies of the Airspeed Indicator

Pilot's Life Blog

Aircraft contain all kinds of wonderous indicators and instruments to measure velocity, altitude, weather conditions, etc. Moving air from outside feeds into the pitot tubes and fills a pressure diaphragm. A plane’s specific stall speed depends on the plane’s size, dimensions, and even weather conditions.