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Learn - Altitude and Speed

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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

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Key Terms

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

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TermDefinition

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.