Which term expresses the airspeed measured by the aircraft’s airspeed indicator before corrections for errors?

• A. Indicated Airspeed
• B. Instrument
• C. In-Flight Shutdown
• D. Gyroplane

Answer: (A)

The airspeed indicator reading that you see in the cockpit is Indicated Airspeed. It shows the speed based on dynamic pressure directly from the pitot-static system, before any corrections are made for instrument or position errors. In other words, it’s the uncorrected speed the instrument displays. Pilots later apply corrections to get Calibrated Airspeed (IAS corrected for instrument and position errors) or True Airspeed (adjusted further for air density and compressibility). The other terms don’t describe the instrument’s reading: the word “Instrument” isn’t the standard term for this measurement, “In-Flight Shutdown” is unrelated, and “Gyroplane” refers to a type of aircraft, not a measurement term.