Indicated Airspeed

The indicated airspeed is listed in the aircraft flight manual for crucial performance values like the stall speed, this makes the IAS a crucial value for the pilot. How about a person who isn’t a pilot? one may be wondering what that means.

This article is aimed at  providing answers to this manual in its meaning, synonyms, antonyms, translations, and its use cases.



Indicated Airspeed / ɪndɪkeɪtɪd eə.spiːd / is an aircraft’s airspeed indicator (ASI), which is powered by the pitot-static system.


The pitot tube’s pitot dynamic pressure is measured via the airspeed indicator.


Other Meaning

The speed of an airplane as displayed on its pitot static airspeed indicator, calibrated to reflect standard atmosphere, is referred to as its indicated airspeed.


Indicated airspeed refers to an aircraft’s speed as displayed on its pitot static airspeed indicator that is calibrated to represent adiabatic conditions.


Indicated airspeed is an instrument which gauges an aircraft’s speed in respect to the surrounding airflow.



Designate speed

Specify velocity

Stipulate velocity

Advisable velocity

Desirable velocity

Recommended velocity

Suggested velocity

Desired velocity

Preferable velocity



Conceal Velocity

Deny Speed

Hide Airspeed

Lose Velocity

Refuse Airspeed

Suppress Speed

Veto Speed



Many languages have a pronunciation to these words, but here we will take a look at some of the ways some world languages pronounce it.

French: vitesse indiquée

Romanian: viteza aerului indicată

Russian: указанная скорость полета (ukazannaya skorost’ poleta)

Latin: indicata airspeed

Mongolian: заасан агаарын хурд (zaasan agaaryn khurd)

Nepali: हवाइ गति संकेत गरियो (Havā’i gati saṅkēta gariyō)


Use Cases

  • The indicator shows the amount of time that has passed while you have been in the air and the condition of your landing gear and throttle.


  • On a cross-country trip, your time and fuel consumption calculations would be wildly off if you utilized indicated airspeed as your basis.


  • True airspeed serves as the foundation for your calculations of cruise performance since it represents the real speed at which your aircraft is moving through the atmosphere.


  • The air molecules essentially move out of the way when your plane travels through them at lower speeds.


  • Once you exceed 100 knots of speed, the air in front of your aircraft begins to condense, which could lead to an error in your calibrated airspeed.


  • True airspeed rises by around 2% per 1,000′ of elevation gain on average, but the actual change is influenced by temperature and pressure.


  • We flew a 125 KIAS constant airspeed climb from Rocky Mountain Metro Airport to Flight Level 240 to show the difference.


Frequently asked Questions

What affects indicated airspeed?

The airspeed displayed represents the actual speed of the airplane in relation to the ground at sea level, 1013.2 mb of atmospheric pressure, and no wind. Air density drops as the airplane climbs, causing the apparent speed to be lower than the true air speed (TAS).


Why is indicated airspeed inaccurate?

Why Do True Airspeed and Indicated Airspeed Differ? Your true airspeed and your indicated airspeed are frequently out of sync. This is due to the fact that your airspeed indicator measures pressure rather than speed. At sea level and under normal circumstances, your airspeed indicator reads precisely.


How does temperature affect indicated airspeed?

True airspeed is affected by wind, temperature, and altitude in addition. The density of the air drops and real airspeed rises when altitude or air temperature rises. As a result, the airplane flies through the air more quickly since there is less air to hinder its forward motion.


Is indicated airspeed the same as ground speed?

The connection between ground speed and airspeed is pretty straightforward. The total airspeed and wind speed is the ground speed. This is what? When an aircraft is flying into the wind, it experiences a tailwind, which causes its ground speed to be higher than its airspeed.



In conclusion, the speed displayed on the airspeed indicator is known as Indicated Airspeed. Airspeed that has been calibrated has had its location installation error fixed. It is calibrated airspeed that has been compressibility-corrected. True Airspeed is equivalent airspeed that has been adjusted for altitude, pressure, and temperature.




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