SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-airspeed-indicator

What does an airspeed indicator show?

It shows the airplane's speed through the air.

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  1. Speed through the air ✔
  2. Height above sea level
  3. Direction of magnetic north

Why: The airspeed indicator measures how fast the airplane moves relative to the surrounding air. That is not always the same as speed over the ground.

Huh, didn't know that: A strong headwind can make groundspeed lower than airspeed.

The dad joke
Why did the airspeed needle hurry? It wanted to get up to speed!
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References

Answer: Speed through the air. The airspeed indicator measures how fast the airplane moves relative to the surrounding air. That is not always the same as speed over the ground.

  1. Civil Air Patrol, Journey of Flight Teacher's Guide www.gocivilairpatrol.com/media/cms/2nd_edition_Teachers_Guide_5D3166D76F9B1.pdf
    The Airspeed Indicator informs the pilot of the speed through the air.
    Checked 2026-10-10.

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