Learn - Altitude and Speed
IAS is the speed read directly from the airspeed indicator gauge, uncorrected for altitude, temperature, or wind. TAS is the actual speed of the aircraft relative to the air mass, calculated by correcting IAS for altitude and temperature, but not wind.
Indicated (IAS)
Read off of gauge
Key Terms
Indicated (IAS)
Read off of gauge
True (TAS)
Airspeed corrected for wind
Ground (GS)
speed across the ground
Calibrated (CAS)
Indicated corrected for installation and instrument errors
Indicated Altitude
Read off of gauge
True Altitude
MSL
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| Term | Definition |
|---|---|
Indicated (IAS) | Read off of gauge |
True (TAS) | Airspeed corrected for wind |
Ground (GS) | speed across the ground |
Calibrated (CAS) | Indicated corrected for installation and instrument errors |
Indicated Altitude | Read off of gauge |
True Altitude | MSL |
Absolute Altitude | AGL |
Pressure Altitude | altitude when set to 29.92 |
Density Altitude | Pressure altitude corrected for non-standard temperature. |