Air Speed Indicator


An airspeed indicator (ASI) is a flight instrument that displays the airspeed of an aircraft in knots (nautical miles per hour), miles per hour (mph) or kilometers per hour (km/h). The ASI measures the differential pressure between the pitot tube (ram air pressure) and the static pressure system (ambient air pressure) to determine the dynamic pressure, which is then converted to airspeed. The ASI is an important instrument for pilots to maintain a safe and efficient flight, as it provides information on the aircraft's speed relative to the surrounding air. It is also used to determine the aircraft's stall speed, maneuvering speed, and maximum speed limits.


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