Indicated Airspeed Pitot Tube Turbulence 
Flight Training Central
APRIL 8, 2024
What does the red line on an airspeed indicator represent? Turbulent or rough-air speed. What altitude does the altimeter indicate? Which instrument will become inoperative if the pitot tube becomes clogged? The pitot system provides impact pressure for which instrument(s)? Airspeed indicator.
Pilot's Life Blog
APRIL 9, 2024
In short, an airspeed indicator measures the ram pressure and compares it to static pressure to determine how fast a plane is moving. Moving air from outside feeds into the pitot tubes and fills a pressure diaphragm. True airspeed (TAS) is the difference between the indicated airspeed and actual speed.
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