Editing Airspeed indicator (section)

{{Short description|Flight instrument}}
The '''airspeed indicator''' ('''ASI''') or '''airspeed gauge''' is a [[flight instrument]] indicating the [[airspeed]] of an [[aircraft]] in [[kilometres per hour]] (km/h), [[knot (unit)|knots]] (kn or kt), [[miles per hour]] (MPH) and/or [[metres per second]] (m/s). The recommendation by [[International Civil Aviation Organization#Use of the International System of Units|ICAO is to use km/h]], however knots (kt) is currently the most used unit. The ASI measures the pressure differential between [[pitot-static system|static pressure]] from the static port, and [[Total pressure (fluids)|total pressure]] from the [[pitot tube]]. This difference in pressure is registered with the ASI pointer on the face of the instrument.<ref name="ASI">{{cite book |title=Pilot's Handbook of Aeronautical Knowledge |date=2016 |publisher=U.S. Dept. of Transportation, FAA |at=8-8 |url=https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/10_phak_ch8.pdf |access-date=10 October 2018}}</ref>

{{multiple image
|footer = Single-engine ASI (left) with [[V speeds]] labelled, and Multi-engine ASI (centre) with blue and red radial lines, as well as (right) showing knots only   
|image1 = ASI.png
|image2 = ASI ME.png
|image3 = Airspeed Indicator.svg
|total_width = 600
}}