Editing Airspeed indicator (section)

== Angle of attack and Lift Reserve Indicators ==
{{multiple image
|footer = LRI (left) and AOA Indicators (right)
|image1 = LRI Meter.jpg
|image2 = AOA Indicators.png
|total_width = 400
}}

An aeroplane can stall at any speed, so monitoring the ASI alone will not prevent a stall.  The critical [[angle of attack]] (AOA) determines when an aircraft will stall.  For a particular configuration, it is a constant independent of weight, bank angle, temperature, [[density altitude]], and the [[center of gravity of an aircraft]].  An AOA indicator provides stall [[situational awareness]] as a means for monitoring the onset of the critical AOA.  The AOA indicator will show the current AOA and its proximity to the critical AOA.<ref name=ASI />{{rp|5-26,5-27}}

Similarly, the Lift Reserve Indicator (LRI) provides a measure of the amount of lift being generated.  It uses a pressure differential system to provide the pilot with a visual representation of reserve lift available.<ref>{{cite web |title=Lift Reserve Indicator |url=http://www.sonexfoundation.com/Lift_Reserve_Indicator.html |website=Sonex Builders & Pilots Foundation |publisher=Sonex Foundation |access-date=10 October 2018 |archive-date=11 October 2018 |archive-url=https://web.archive.org/web/20181011014030/http://www.sonexfoundation.com/Lift_Reserve_Indicator.html |url-status=dead }}</ref>

{{multiple image
|image1 = PFD.png
|footer = [[Primary flight display|Primary Flight Display (PFD)]] with the ASI in the form of "Airspeed Tape", including color coded ranges (left), and a combined ASI and Machmeter for a jet aircraft (right)
|image2 = ASI Jet.png
|total_width=600
}}
{{Clear}}