Quick Facts
- Type
- Speed Reference
- Definition
- The airspeed reading displayed directly on the cockpit instrument, based on d...
- Used By
- Pilots
Definition#
Indicated airspeed (IAS) is the speed shown on the airspeed indicator, derived from the difference between total (pitot) pressure and static pressure. It is uncorrected for position error, compressibility, and air density.
Why It Matters Operationally#
IAS is the primary reference for V-speeds (stall speed, flap speeds, Vne) because aerodynamic forces depend on dynamic pressure, which IAS approximates. Regardless of altitude, the same IAS produces roughly the same aerodynamic effect.
Related Guides#
- How Airplanes Fly — The Complete Aviation Fundamentals Guide
- Density Altitude Explained
- What Is a Stall?
- How Jet Engines Work (Turbofan vs Turboprop)