airspeed
Definition
- Noun:
- The speed of an aircraft relative to the air in which it is flying: This is the fundamental measurement of how fast an airplane is moving through the air mass surrounding it, not relative to the ground.
Usage
- Airspeed is a critical technical term in aviation. It is distinct from . Pilots and air traffic controllers use it for navigation, safety, and performance calculations. It is typically measured by an instrument called an airspeed indicator and expressed in knots (kt), miles per hour (mph), or kilometers per hour (km/h).
Examples
- The pilot reduced airspeed before extending the landing gear.
- A strong headwind means our airspeed is higher than our groundspeed.
- Maintaining the correct airspeed is essential for a safe takeoff.
Advanced Usage
- Indicated Airspeed (IAS): The speed read directly from the aircraft's airspeed indicator.
- True Airspeed (TAS): The actual speed of the aircraft relative to the air, corrected for altitude and temperature.
- Calibrated Airspeed (CAS): Indicated airspeed corrected for instrument and positional errors.
Variants and Related Words
- Airspeed indicator (noun phrase): The cockpit instrument that displays airspeed.
- Groundspeed (noun): The speed of an aircraft relative to the ground.
Synonyms
- Velocity (relative to the air)
Noun
-
the speed of an aircraft relative to the air in which it is flying
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