Indicated Airspeed Knot True Airspeed 
Pilot's Life Blog
APRIL 9, 2024
True Airspeed vs Indicated Airspeed VS Equivalent Airspeed Since airspeed indicators use air pressure to measure speed, the indicated airspeed can be less than the actual airspeed at higher altitudes.
Chess In the Air
JUNE 24, 2022
This is consistent with Rick’s report, which referenced 9 knots of wind. Without knowing the horizontal wind direction and speed at this point it is impossible to say what his indicated airspeed was. A sudden gust of 50 knots would have caused a stall unless he had been flying at about 100 knots indicated.
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